MCQ for H.S

 1. A chemical cell of emf  E and internal resistance r is connected to a resistance R .The potential difference across R is given by : 

A) V = Er/( r + R)  B) V = ER/(R+r)  c)  E(R +r)/2Rr  D) 2ERr/(R+r) 

2.On shunting a galvanometer its : 

A) Current measuring range decreases but current sensitivity increases .

B) Current measuring range and sensitivity  both decreases 

c) Current measuring range and sensitivity both increases . 

D) Current measuring range increases and sensitivity decreases 

3. Which of the following nuclei has lest possibility of undergoing nuclear fission or fusion ? 

A) ₁H²  B)  ₉₂U²³⁵ C) ₂₆Fe⁵⁶ D) ₉₄Pu²³⁹ 

4.Which of the following optical media has the greatest refractive index ?

A) Diamond  B) Glass  C) Water  D) Air 

5.An electric dipole is kept in a uniform electric field such that  its dipole moment p is anti parallel to electric electric field E . The torque acting on the dipole will be : 

A) -2pE  B)) - p E  C) Zero  D) p E 

 6.A 8µF capacitor is charged with 400 V and then its plates are connected to a resistance of 10 kΩ. The heat produced in the resistance is : 

A) 0.16J  B) 0.32J  C) 0.64 J  D) 1.28 J 

7. A body of mass 5kg at rest is raised to a height of 10 m under a constant force of 170 N . At the height of 10 m the velocity of the body will be : (g = 9.8 m/s² ) 

A) 9.8 m/s  B) 15.0 m/s  C) 22.0 m/s  D) 37.0 m/s 

8. A potentiometer wire is 10 m long and has a resistance of 40 Ω. It is connected to a resistance of 20 Ω and an ideal battery of 3 V emf in series . The potential gradient along the wire is : 

A) 0.1V/m  B) 0.2 V/m C) 0.3V/m  D)  0.4 V/m 

9. A spring of length l and force constant k is divided in two parts A and B such that lₐ : lᵦ = 2 : 3 .The force constant of part A will be : 

A) 3/2 k  B) 5/2 k  C) 2/5 k  D) k 

10. Outside a nucleus : A) a proton is stable  B) a neutron is stable  C) neutron and proton both are stable  D) neither proton nor neutron is stable . 

11.  Photons of energy 7.0 eV incident on a surface of work function 2.0 eV . The maximum velocity of the emitted electron is : 

A) 1.33 x 10⁶ m/s B) 5.0 x 10⁷ m/s C) 9.0 x 10⁶ m/s D) 1.4 x 10⁵ m/s 

12.The de-Broglie  wavelength associated with a particle of mass m and kinetic energy E is proportional to : A) m √E  B) √E/m  C) 1/ ✓Em D) ✓mE 

13. Two waves having intensities in the ratio 9 : 1 exhibit interference . The ratio of maximum to the minimum intensities in the interference pattern is : 

A) 10:8  B) 9 :3  C) 4 :1  D) 2 : 1 

14.Which of the following phenomena is not common to sound and light wave ? 

A) Interference  B) Diffraction   C) Reflection  D) Polarization 

15. A circular coil A has a radius r and carries a current I . Another coil with radius 2 r and carries current 2 I . The ratio of the magnetic field Ba/Bᵦ at the centres of the two coils is : 

A) 1 :1  B) 2 :1  C) 4 : 1 D) 1; 4 

16. Which of the following is not an unit of energy  ?

A) Electron -volt  B) Killowatt-hour  C) Joule  D ) Horse power  

17.Complete the sentence given below using the options provided in the bracket .

( kinetic energy , total energy , sum of mass and energy , potential energy ) 

i) The quantities conserved in elastic  collision are linear momentum and ------------.

ii) In nuclear reactions ----------- is conserved . 

18. A spherical metal bob of mass 100 g is attached to 1 m long string and suspended from a rigid support . It is  then displaced to  one side from its equilibrium position O to a position A which is 5 cm above its equilibrium position ( g = 10 m/s² ) 

i ) The potential energy of the bob at position A is 

A) 5000 J B) 50 J  C) 0.5 J  D) 0.05 J

ii) When released from position A with what velocity will it pass through position O ? 

A) 1 m/s  B) 10 m/s  C) 100m/s  D) 1000 m/s 

19. Read the passage given below and the questions that follow : 

The force(F) vs displacement(x) of a body is given in the above fig. fill in the blanks given below from the options provided .

I) The body starts decelerating from the point ------------- of the graph .

A) B. B) C   C ) D  D)  E

ii) The minimum work is done when it moves between ---------------.

A) 2 m - 3 m. B) 3 m - 4 m C) 4 m - 5 m D) 1 m - 2 m 

VSA for MP2025

 1.Answer the following questions ( VSA) :

1.1 Fill in the blank : In Troposphere temperature ---------- with increase in altitude .

1.2 Mention one harmful effect of global warming .

1.3 Which atom released from chloroflorocarbon under the influence of UV rays decompose ozone into oxygen ?

1.4 Mention one use of bio- gas .

1.5 What is the role NO in decomposition of ozone in the ozone layer ?

1.6 Among charcoal , petrol and ethanol which one is a fossil fuel ?

1.7 Write down the unit of calorific value of fuel .

1.8 Does the temperature increase or decrease with increase of altitude in the Stratosphere ?

1.9 Which radiation , coming from the sun , is prevented by the Ozone layer from falling on the earth’s surface ?

1.10 Which fuel gas is harvested from coal bed ?

1.11 Name a gas present in air , the increase in amount of which causes global warming .

1.12 Name an energy source which can be used for sustainable development.

1.13. Mention one fuel which is alternative to fossil fuel .

1.14 Write the name of a gas which increases atmospheric temperature .

1.15 Fill in the blank: -------- radiation ,coming from the sun is prevented by the ozone layer from falling on the earths surface .

1.16 Name a gas present in the atmosphere which is not a greenhouse gas .

1.17 What is meant by – the calorific value of a sample of coal is 30000 kJ/kg ?

1.18 Why can wind energy be used for sustainable growth development ?

1.19 Write whether the following statement is true and false : Inder the same condition of temperature and pressure equal volume of CO2 and N2 gas contain different number of molecules.

1.20 Write down the relation between the pressure and volume of a given mass of a gas according to Boyle’s law when temperature remains constant.

1.21 What is the unit of M in the equation PV = W/M RT ? ( Symbol s have usual meaning)

1.22 Under constant pressure, at what temperature in degree Celsius the volume of an ideal gas will be zero according to Charles ‘ law ?

1.23 State whether the following statement is true or false : The volume of gas molecules is taken into consideration in Avogadro’s Law .

1.24 The product of volume and pressure of how many gram of N2 gas is 224 litre atmosphere at STP ?(N = 14)

1.25 Write whether the following statement is true or false : The speed of the gas molecules contained in a closed vessel at fixed temperature and pressure is the same .

1.26 What is the nature of V versus T graph according to Charles’ law .

1.27 What is the SI unit of pressure of gas ?

1.28 What are the constants in Charles law ?

1.29 Write whether the following statement is true or false : Per degree interval in Kelvin scale of temperature is equal to perform degree interval in Celsius scale .

1.30 At a certain pressure the volume of a fixed mass of a gas at a temperature of 00 C is V0 ; what will be the increase in volume of the gas , according to Charles’ law , if the temperature of the gas is raised by 10C keeping the pressure unchanged ?

1.31 What will be the ratio of molecules present in 1 L of H2 and 4 L CO2 gas at STP ?

1.32 Between apparent and real expansion coefficients of a liquid which one is it’s own characteristic?

1.33 What is the SI unit of thermal conductivity ?

1 34 Whether the following statement is true or false? The real expansion of any liquid depends on the expansion of the vessel in which it is kept .

1.35:Among iron , invar and copper which one has the least co-efficient of linear expansion?

1.36 State whether the following statement is true or false. The constituent of a material change position during conduction of heat through it .

1.37 The width and the cross- section of a conductor remaining unchanged , what is the relation between the thermal resistance and thermal conductivity of that conductor?

1.38 Write whether the following statement is true or false: Among copper , invar and iron the linear expansion coefficient of iron is the lowest .

1.39 What is the unit of volume expansion coefficient?

1.40 Write whether the following statement is true or false: The value of coefficient of linear expansion of solid is the same in Celsius and Kelvin scale .

1.41 Arrange diamond iron and silver in the order of decreasing thermal conductivity.

1.42 Give a natural example of dispersion of light .

1.43 Which type of lens can rectify myopic vision ?

1.44 Between the angle of incidence and the angle of refraction which one is greater when light travels from a rarer to a denser medium ?

1.45 What type of mirror is used in the viewfinder of a motor car ?

1.46 What will be the angle of incidence when a ray of light passes through the centre of curvature of a concave mirror ?

1.47 How many rectangular surfaces are there in a prism ?

1.48 What is meant by the pole of a spherical mirror ?

1.49 Write down one use of X- ray .

1.50 Is it possible to form a virtual image of shorter length of the object by any mirror ?

1.51 What type of mirror is used in the head light of a motor car ?

1.52 If the refractive indices of a medium for red and blue colors of light are nr and nb respectively , which one is greater in magnitude ?

1.53 Write one use of convex mirror?

1.54 A ray parallel to the principal axis of a concave mirror follows which path after reflection by the concave mirror ?

1.55 How much work has to be done when 1 coulomb of charge is taken against a potential difference of 1 volt ?

1.56 From which part of a radioactive atom is beta particle emitted ?

1.57 what is the atomic number of the daughter element produced if an alpha particle is emitted from 238 U92 ?

1.58 How does the resistance of a semiconductor change with increase of temperature?

1.59 Which type of energy is transformed to electrical energy in a dynamo ?

1.60 Arrange alpha, beta and gamma rays in ascending order of their penetrating power ?

1.61 Which kind of nuclear reaction is the source of sun’s energy ?

1.62 Give an example of semiconductor.

1.63 A thin wire and a thick wire of the same conducting material have the same length .Which one of them will carry more current when connected to the same potential difference?

1.64 Mention one misuse of nuclear fission reaction .

1.65 Which law explain the release of huge amount of energy in nuclear fusion ?

1.66 Write down one use of X - ray .

1.67 Name a machine where electrical energy is converted to mechanical energy.

1.68 Apart from the live wire , what are the two other wires in the household circuit ?

1.69 What is the SI unit of electric charge ?

1.70 What is the unit of electrical conductance ?

1.71 What are the constituents of fuse wire ?

1.72 Kilowatt-hour is the unit of which physical quantity ?

1.73 If the same potential difference is applied between the two ends of iron and copper wires having the same length and cross section , does equal amount of current flow through the two wires ?

1.74 Draw I – V graph according to ohm’s law in the case of metallic wires .

1.75 Mention one peaceful use of atomic energy.

1.76 Fill in the blank : gamma ray is ------------ wave of short wavelength .

Mp 2025MCQ

 MCQ for MP 2025

1. Choose the correct alternative (MCQ) :answer keys for Q1 to 20 :(https://forms.gle/Qn2ZzzjugwYt7Vt18)  Q 21 to40 : (https://forms.gle/AK3F2oryd2T7dH6A6)

1.1 Which of the following is not a greenhouse gas ? a) methane b) water vapour c) carbon dioxide d) oxygen

1.2 Which of the following greenhouse gases has a maximum contribution towards global warming? a) N2O b) CH4 C) CO2 d) H2O vapour

1.3 Which among the following gases absorb long wavelength infrared radiation emitted from the earth’s surface ? a) N2 b) O2 c) CH4 d) He

1.4 Which among the following gases does not help in the depletion of ozone in the ozone layer ? a) NO b) NO2 c) CFC d) CO2

1.5 Which layer of atmosphere has the greatest density ? a) Troposphere b) Stratosphere c) Mesosphere d) Thermosphere

1.6 Which of the following gas helps in the depletion of ozone layer? a) CO2 b) Ar c) CFC d) He

1.7 Which is the main constituent of bio gas ? a) CH4 b) CFC c) CO2 d) CO

1.8 When do real gases behaves as ideal gas ? a) at high temperatures and high pressure b) at high temperatures and low pressure c) at low temperatures and low pressure d) at low temperatures and high pressure

1.9 At STP number of moles in 44 g CO2 is – a) 1 b) 2 c) 3 d) 4

1.10 What is value of PV for 4 g of H2 has at STP ( H = 1 ) a) RT b) 2 RT c) 4 RT d) 0.5 RT

1.11 In case of ideal gas ratio of coefficient of volume and pressure expansion is – a) 0 b) 1 c) 1/273 d) 2

1.12 The P – V graph of Boyle’s Law related to gas is –

1.13 What is the value PV for 11.2 litres of an ideal gas at STP ? a) 2RT b) RT c) 0.5 RT d) 11.2 RT

1.14 At STP 2.24 L is occupied by – a) 4.4 g CO2 b) 0.64 g SO2 c) 28 g CO d) 16 g O2 ( C = 12 , O = 16 , S = 32 )

1.15 According to Boyl’s law which is the PV – P graph –

1.16 Which of the following is the SI unit of pressure ? a) Nm2 b) Nm-2 c) Nm d) N

1.17 Vapour density of a gas is 32 . Which of the following is its molecular weight ? a) 8.b) 16 c) 32 d) 64

1.18 If the vapour density of a carbon containing gaseous substance is 13 , which of the following can be its molecular formula? a) CO2 b) C2 H4 c) C2H6 d) C2H2

1.19 How many molecules of CO2 will be produced when one mole of C reacts completely with 1 mole O2 ? a) 6.022 x 1023 b) 1.806 x 1024 c) 6.022 x 1022 d) 6.022 x 1024

1.20 According to to the following chemical equation CH4 + 2 O2 = CO2 + 2H2O what volume of O2 will be required to burn 10 mole of CH4 at STP ? a) 448 L b) 224 L c) 44.8 L d) 22.4 L

1.21 The relation between molecular mass ( M) and vapour density ( D) of a gaseous substance is – a) 2M = D b) M = D2 c) M = 2.8 D d) M = 2D

1.22 How many gram of O2 will be required to make CO2 by burning 12 g of C completely ? ( C = 12 O = 16) a) 32 g b) 12 g c) 16 g d) 44 g

1.23 On which of the following does the thermal conductivity of a metal depend ? a) temperature b) length c) nature of the material d) area of cross section.

1.24 The unit of co-efficient of linear expansion of a solid is – a) m b) m-1 c) o C-1 d) oC

1.25 For a solid how many types of thermal expansion co-efficients are there ? a) one b) two c) three d) four

1.26 Which among the following substances has the highest heat conductivity? a) Silver b) Diamond c) Copper d) Aluminium

1.27 How many types of thermal expansion coefficient are there for a liquid ? a) 0 b) 1 c) 2 d) 3

1.28 What is the relation between the radius of curvature and the focal length of a mirror?a) f = 2r b) f = r/2 c) f = r/3 d) f = 3/2 r

1.29 Which of the following colours deviates most when white light is retracted by a prism ? a) red b) yellow c) violet d) green

1.30 From the following which states the relation between refractive index and wavelength of light ?

1.31 An object is placed in between the optical centre and focus of a thin convex lens . What is the nature of image of the object ? a) real and inverted b) virtual and inverted c) real and erect d) virtual and erect

1.32 Magnified virtual image is formed by a) convex mirror b) convex lens c) concave lens d) plain mirror .

1.33 When a ray of light is incident perpendicularly on a transparent glass slab the angle of incidence is – a) 0o b) 1800 c) 30o d) 90o

1.34 Which one of the following has the highest wavelength? a) X- ray b) gamma ray c) infrared ray d) ultraviolet ray

1.35 In case of refraction , if the angle of incidence and the angle of refraction are 450 and 300 respectively, then the angle of deviation is – a) 750 b) 150 c) 7.50 d) 37.50

1.36 If a beam of red light and a beam of violet light are incident at the same angle on the on the inclined surface of a prism from air medium and produce angles of refraction r and b respectively, which of the following is correct? a) r = v b) r = 1/v c) r > v d) r < v

1.37 A point source of light is placed at the centre of curvature of a concave mirror. The angle of deviation of the rays incident from this source and reflected from it , is – a) 00 b) 1800 c) 900 d) 3600

1.38 The wavelength of which of the following is greater than the visible light ? a) X- ray b) infrared ray c) gamma ray d) ultraviolet ray

1.39 Dentists use – a) convex mirror b) convex lens c) concave mirror d) concave lens

1.40 In the case of refraction of white light through prism the light of colour which deviates least is a) yellow b) orange c) red d) violet

1.41 If a reflected ray from a concave mirror makes an angles of 450 with the normal , the angle of incidence will be – a) 900 b) 22.50 c) 1350 d) 450

1.42 Which of the following physical quantities represents ampere ? a) coulomb – second b) volt-1ohm c) volt- ohm-1 d) volt- ohm .

1.43 Resistivity of which of the following decreases with increase of tempe? a) conductor b) semiconductor c) superconductor d) insulator

1.44 Which of the following is the correct order of ionisation power for alpha , beta and gamma rays ? a) alpha>beta >gamma b) alpha > gamma> beta c) gamma>beta>alpha d) beta> alpha> gamma

1.45 Which of the units given below is the SI unit of resistance? a) volt b) ampere c) coulomb d) ohm

1.46 In domestic electric cirçuit the fuse wire is connected to which of the following? a) earth line b) live line c) neutral line d) v th live and neutral line

1.47 Beta – ray emitted from a radioactive element is – a) a stream of electrons b) a stream of protons c) a stream of neutrons d) electromagnetic wave

1.48 Temperature remaining constant if the potential difference between two ends of a conductor is V and the current through the conductor is I , which of the following is true ? a) V proportional to I b) V proportional to I2 c) V proportional to I-1 d) V proportional to I-2

1.49 The relation among electromotive force (V) work(W) and charge (Q) is – a) Q = WV b) Q = V/W c) Q = V/W2 d) Q = W/V

1.50 For the atom produced by beta particle emission from a radioactive atom – a) mass number increases b) atomic number increases c) mass number decreases d) atomic number decreases

1.51 Coulomb’s law related to electric charges applicable when of the two charges – a) one point , one is spherical b) both are spherical c) one is point ,one is extended d) both are points charges

1.52 The characteristics of a fuse wire are – a) high resistance,high melting point b) low resistance, low melting point c) low resistance ,high melting point d) high resistance,low melting point

1.53 Present in alpha particle – a) one proton ,one neutron b) one proton c) two protons ,two neutrons d) one electron

1.54 Charge of an electron is - a) – 3.2 x 10-19 C b) – 1.6 x 10 – 19 C c) 1.6 x 10 – 19 C d) 3.2 x 10 – 19 C

1.55 If the resistance( R) of a conductor and the time of flow of current in the conductor ( t) remain unchanged , the relation between the heat produced (H) in the conductor and flow of current (I) is – a) H proportional to I b) H proportional to 1/I2 c) H proportional to I2 d) H proportional to 1/I

1.56 If 12 C of charge flows through a conductor for 2 minutes the electric current is – a) 6 amperes b) 0.1 amperes c) 24 amperes d) 10 amperes

1.57 What is the unit of conductivity ? a) mho metre-1 b) ohm.metre-1 c) mho.metre d) ohm .metre

1.58 If a current of 0.2 ampere flows through a conductor of resistance 40 ohm , what is the potential difference between the two ends of the conductor? a) 0.5 volt b) 2 volt c) 6 volt d) 8 volt

1.59 The correct order of penetrating power of alpha ,beta and gamma rays is – a) gamma>alpha>beta b) gamma >beta> alpha c) alpha> beta>gamma d) beta> gamma > alpha

1.60 Electric current is flowing through a wire . In this state the wire is elongated in length current will be – a) increased b) decreased c) first increased and then decreased d) will not depend on increase of length

1.61 If 5 ampere current flows through a conductor in 30 second the total charge flowed through the wire is a) 6 coulomb b) 150 coulomb c) 30 coulomb d) 300 coulomb

Mock test math 2024

 Mock Test math 2024.

Class - X Time - 3 hrs 15 min. Full marks - 90 

1. Choose the correct option: 1 x 6 = 6

I) If principal become twice as it's amount in 10 yrs , the rate of simple interest per annum is - 

a. 5% b.10 %  c. 15 % d. 20 % 

ii) If the roots of the equation 3 x² + 8 x + 2 = 0 be p and q , then ( 1/p + 1/q ) is - 

a. -3/8. b. 2/3. c. -4  d. 4 

iii) If the radius of two circles is 3 cm and 4 cm and the distance between their centres is 10 cm then the number of common tangent is - 

a. 0 b. 2 c . 3. d. 4 

iv) If the ratio of curved surfaces of two solid spheres is 16 : 9 , then the ratio of their volumes is - 

a. 64 : 27 b. 4 : 3 c. 27 : 64  d. 3 : 4 

v) The value of ( sin 43º cos 47 º + cos 43 º sin 47 ⁰ ) 

a. 0. b. 1  c. sin 4⁰   d. cos 4 º 

vi) If the mean of the numbers 6 ,7 , 8, x, y, 14 is 9 then - 

a. x + y = 21. b. x + y = 19 c. x -y = 21  d. x -y = 19 

Fill in the blanks( any five): 1 x 5 = 5 

i) If A invests Rs 500 for 9 months and B invests Rs 600 for 5 months in a business then the ratio of their profits is --------------.

ii) If x is proportional to y the x ⁿ ∝ ----------.

iii) The angle in a semi-circle is a --------------.

iv) If the angle of elevation of sun is 45 º ,then the length of shadow and length of post are ----------.

v) Mean ,median and mode are the measure of ---------------.

vi) The number of surfaces of a solid hemisphere is ----------.

3. Write true or false (any five): 1 x 5 = 5

i) On a certain sum for one year the simple and compound interest are the same if interest is calculated annually .

ii) Conjugate of √5 + 2 is √5 - 2 

iii) The volume of a solid hemisphere of radius 2 r is 2/3 π r³ 

iv) The number of common tangent of two circles when they meet externally is 3.

v) The reciprocal of tan (90º - A) is cot A.

vi) Mode is the value of a data having minimum frequency.

Electric Current

                                                                               Electric Current .

We are familiar with electric current from our very childhood .We make use of current in our day to day activities .One layman once told me current is one kind of fire flowing inside wires. Such kind of conception may be  present in many of us. In order to understand what current is we have to understand the basic  structure of atoms . Any type of atom contains  three elementary particles . These are electron proton and  neutron .Electrons and protons are charged particles .electrons are negatively charged and protons  positively charged. Protons reside in the central part of atom and they are not movable .Electron circles round the central part (nucleus) in different shells .In some element electrons revolving in the outermost shells are easily detachable and hence they are moveable from one atom to another . In conductor outer most Electrons become practically free  to move anywhere randomly .These electrons are called free electrons . So in conductor we have some free electrons moving randomly just like random motion of gas molecules  in  a container . When current flows in a conducting wire  another motion known  as drift motion is superimposed on random motion of free electrons due the presence of electric field supplied by battery or other e m f source .Due to drift motion electrons have drift velocity . This drift velocity is not very much only a few centimetre per second . Since electrons are negatively charged they move opposite to the direction of applied field . So to have electric current we need two things one is a substance having free electrons and an electric field  across the substance (wire)  Metals such  as copper ,aluminium   and iron etc are all substances with lot of free electrons .To get electric field we need changing magnetic field as changing magnetic field produces electric fields according to  Farady's law of induction .Another way to get electric field we need static electric charges as in battery .In battery two conducting plates placed slight distance apart with a chemical substance in between them .The plates  become oppositely charged  resulting with a generation of electric field .The current generated with the application of electric field across a conductor is proportional to electric field . This is Ohm’s law .As the electrons flow within wire they collide with ions ,atoms and on themselves . Due to these collisions they transfer energy heating the conductor and they feel difficulty in drifting forward .  So electrons face resistance as they flow inside conductor. This resistance is a property or characteristics of conductor. It depends on length , Cross sectional area and material nature and temperature etc .A good conductor has less resistance . Our body is also a good conductor of electricity as it contains various ions such as sodium ,potassium  etc . When current passes through our body cells will die and death may be it’s  consequent result. A conductor’s  resistance increases with increase of temperature.In  case of insulators resistance is infinite due absence of free electrons .  Insulators such as dry wood ,plastic and glass  have  no free electrons to conduct electricity .But there is a substance called semiconductor that offers resistance in between insulator and conductor.  In semiconductor  with increase of temperature within a certain range resistance decreases .Silicon and germinium are ideal semiconductor .In modern electronic gadgets we find many application of semiconductors . As temperature is lowered to near absolute zero resistance vanishes ie conductor becomes super conductor. In super conductor current is maintained without any loss of power .Here Ohm’s law is no longer a valid law .Current can be maintained without any power source in super conducting wire

Questions on physical science (class IX)

 1. Choose the correct alternative (MCQ) : 

i) The dimensional formula of force is 

a) [MºLT⁻¹]  b) [MLT⁻²]  c) [ML²T⁻²]  d) [ML⁻¹T⁻²] 

ii) What is the momentum of an object of mass m moving with velocity v  ? 

a) (mv)²  b) mv² c) 1/2 mv²  d) mv 

iii) Which one of the following substance has the greatest viscosity ? 

a) Water  b) mercury c) oxygen iv) hydrogen 

iv) Soap or detergent is an example of 

a) Emulsifier b) sol  c) aerosol d) solid foam 

v) 16 a.m.u is the mass of  

a) one oxygen atom b) one oxygen molecule  c) one mole of oxygen d) one mole of oxygen atom 

vi) The concept of nucleus of an atom was given by 

a) J. J. Thomson  b) Niels Borh  iii) Rutherford iv) M. Curie  

vii) Fractional distillation is used for separation of mixture 

i) solid in liquid mixture ii) liquid in mixture iii) liquid-liquid immiscible iv) liquid-liquid miscible 

viii) Acid turns blue litmus paper to 

a) red  b) deep violet c) green d) colorless 

ix) Which one is a basic salt ?

a) Na₂SO₄  b) Na₂HPO₄  c) NaCl  d) Pb(OH)Cl 

x) The rate of doing work is called 

a) Velocity b) energy  c) power d) force 

xi) Due to special behavior of water , lakes and pond freezes 

a) first at the bottom b) first in the middle c) first at their surface d) anywhere 

xii) Loudness of  sound can be expressed in 

a) Hz b) db  c) m  d) m/s 

xiii) Temporary hardness is due to the presence of which compound in water ? 

a) Na Cl  b) CaSO₄  c) NaNO₃  d) Ca(HCO₃)₂ 

Physical Science Question Paper (Class X)

                         Group A 

1. MCQ type question ( All questions are compulsory ) : 

( https://forms.gle/ePqysL8Ab8CzDk3S6 )

 Each of the following questions has four alternatives . Write the correct one . 

1.1 Which one of the following does not deplete ozone layer ? 

a) NO          b) N₂O   c) CO₂    d) CFC 

1.2 Which  of the following is equal to 290K ? 

a) 30ºC   b) 17ºC  c) 0ºC  d) 27ºC 

1.3 The molecular weight of methene is 16 , which of the following is its vapour density ? 

a) 22.4   b)  8     c) 16     d) 32 

1.4 Which of the following has the highest thermal conductivity  in cal.cm⁻¹s⁻¹K⁻¹ unit ) ? 

a) Copper    b) Gold  c) Iron   d) Diamond 

1.5 For which angle of incidence deviation is minimum during refraction of light from lighter to denser medium ? 

a) 60º  b) 0º   c) 90º  d) 45º  

1.6 Which pair of the following is the two terminal colours in pure spectrum of while light ? 

a) Red and violet   b) Red and green   c) Violet and orange   d) Blue and indigo 

1.7 Which one of the following is the unit of electric charge ? 

a) volt   b) coulomb   c) ohm    d) watt 

1.8 What will be the equivalent resistance where two resistances of 3 ohm and 6 ohm are connected in parallel combination ?
a) 3 ohm  b) 4 ohm   c) 2 ohm  d) 1 ohm 

1.9 Which of the following is the correct order of decreasing power of ionising of gas ?

a) α >β ＞४  b) ४ ＞ β ＞ ∝  c)  α ＞४ > β   d) ४ > α > β 

1.10  Which of the following is not a transition element ? 

a) Fe   b) Co  c) Ca  d) Cr 

1.11 Which one of the following is an ionic compound ? 

a) HCl    b) CH₄   c) MgCl₂  d) NH₃ 

1.12 Which of the following is a weak electrolyte ? 

a) CuSO₄   b) KOH  c) H₂SO₄  d) CH₃COOH 

1.13 Which of the following gases can be prepared by Kipp's apparatus ? 

a) N₂   b) H₂S      c) HCl  d)  NH₃ 

1.14 Hematite is the one ore of which of the following metals ? 

a) Copper  b) Aluminium   c) Iron  d) Zinc  

1.15 Which of the following functional groups is present in ethyl alcohol ? 

a) 一CHO   b) ＞C=O    c) 一COOH    d) 一OH 

                        Group -  B 

2. Answer the following questions(Alternative are to be noted ) 1 x 21 =21 

2.1 In which layer of atmosphere do storm and rains occur ?

Or 

What are the bacteria called which decompose biomass to methane in biogas plant ? 

2.2 Fill up the blank : In stratosphere temperature .............................with increase in altitude .

2.3 What is the temperature in ºC at which volume of a gas will be zero at constant pressure according to Charles' law ? 

2.4 A gas at fixed temperature is kept in a closed vessel . Some more amount of the same gas is added to the vessel without altering the temperature .What will be the change in pressure ? 

2.5 What is the SI unit of coefficient of linear expansion of a solid ? 

            or 

Write down the relation among the linear , surface and volume expansion  coefficients of a solid ? 

2.6 What type of spherical mirror is used in the head light of cars ? 

2.7 Where will the image be formed when an object is placed at the focus of a convex lens ? 

2.8 Define the resistance of a conductor according to Ohm's law .

2.9 What is the SI unit of resistivity ?

2.10 From which part of an atom the radioactive rays emanate ?

     or 

Name a positively charged radioactive particle . 

2.11 Match the right column with the left : 

Left Column	Right Column
2.11.1 The most electronegative element of group 17	i ) Zn
2.11.2 An alkaline earth metal	ii) Sn
2.11.3 A metal which can be prepared by the carbon reduction of its oxide .	iii) F
2.11.4 Present in bronze	iv) Mg

2.12 Which type of electricity is used in electrolysis ? 

2.13 What is used as electrolyte in the electroplating of gold over silver ? 

2.14 Write the formula of the precipitate when an aqueous solution of ammonia is added to the aqueous solution of ferric chloride ? 

      or 

What is liquor ammonia ? 

2.15 What change of colour is observer when a few drops of aqueous  solution of sodium nitroprusside is added to an aqueous solution of hydrogen sulphide made alkaline with NaOH solution ? 

2.16 Write whether the following statement is true or false : 

aqueous solution of glucose can conduct electricity .

2.17 write UPAC name of the following compound . 

CH₃CH₂CHO 

2.18 Which gas is liberated when Na HCO₃ is added to acetic acid ? 

      or 

Write down the formula of the organic compound produced in the first step in the substitution reaction of methane with chlorine . 

Group - C 

3. Answer the following questions ( Alternative to be noted ) : 2x 9 = 18 

3.1 Write the two harmful effects of depletion of ozone layer on human health and environment .

3.2 The volume of a gas at 300 K temperature and 760mmHg of pressure is 300 cm³ . What is the volume of the gas at STP ?

 Or 

Find out the volume of 2.2 g of CO₂ at temperature 300K and 570mmHg 0f pressure ( C = 12 , O = 16 , R = 0.082 Latmos .K⁻¹ mol⁻¹ ) 

3.3 Write the laws  of refraction of light .

3.4 How does resistance depend of length and cross section of  a conductor / ? 

Or 

Write down Fleming's left hand rule .

3.5 Draw Lewis -dot diagram of  carbon dioxide .

Or 

Show with an example that ionic can be formed even when its ions have no filled octet .

3.6 Compare two properties of ionic and co-valent compounds 

3.7 Write the condition and balanced chemical equation of the reaction for the preparation of ammonia gas in the laboratory. 

 Or 

Show that H₂S is  a reducing agent with the help of a chemical reaction .

3.8 Write with example the difference between mineral and ore .

3.9 Write the names of monomers of PVC an teflon .

Or 

 Write constitutional formulas of two organic compounds having the same molecular formula C₂H₆O 

          Group -D 

4. Answer the following questions ( Alternative are to be noted ): 3x 12 =36 

4.1 Establish the combined form of Charles' law and Boyle's law. 

4.2  How many gram of ferrous sulphide will be required to prepare 1.7 gram of hydrogen sulphide  gas by the reaction of ferrus sulphide and dilute sulfuric acid ? ( Fe =56 , S = 32 , H = 1 )  

Or 

Metallic zinc and carbon monoxide are produced when zinc oxide is heated with carbon . How many gram of carbon will be required to produce 31.785 g of zinc and 14.000 g of carbon monoxide from 40.685 g of zinc oxide ? How many mole of carbon monoxide is produced in the reaction ? (C = 12 , O =16 ) 

4.3  What is meant by coefficient of thermal conductivity of a substance ? Establish the relation between CGS and SI units of it . 

4.4 What is meant by focus of  a lens ? 

4.5 Prove that  δ = i₁  + i₂ - A in case of refraction of light through a prism. (The symbols has usual meaning ) 

  Or  

If the refractive index of a medium for red and violet light are μ₁ & μ₂ respectively prove that μ₁ < μ₂ 

4.6 State Joule's law of heating of current . 

4.7 When an electric lamp is connected to 220V mains  1 ampere of current flows . What will be the current when the lamp is connected to 110V mains ? 

 Or 

Find the ration of the resistances of two lamps of 220V- 60W and 110V- 60W . 

4.8 What is radioactivity ? 

Write down  two uses of radioactivity . 

Or 

When a radioactive atom emits an α particle how are atomic number and mass number changed in the daughter atom ? 

By the emission of which radioactive ray from a radioactive atom , the atomic number remains unchanged ? 

4.9 What is meant by ionization energy of an element ? 

Arrange Li , Na and K in the increasing order of their ionization energy . 

4.10 Mention the following points in case of electrorefining of copper . 

i) electrodes  used and the electrolyte 

ii) the chemical reaction occurring at the electrodes .

4.11 In the laboratory preparation of nitrogen , why instead of heating directly a concentrated aqueous solution of ammonium nitrite , a mixed aqueous concentrated solution of ammonium chloride and sodium nitrite mixed in equimolar proportion is heated ? Answer with balanced chemical equations . 

Or 

Write with condition and balanced chemical equation how urea is industrially prepared . 

4.12 C₂H₆ is called a saturated hydrocarbon , but why is C₂H₄ called an unsaturated hydrocarbon ? 

Or 

How will you convert HC≡CH → Br₂CHCHBr₂ ? 

Mention  one use of CNG 

Answer keys : 

    Q 1 . To know answer copy the following link and paste it on your browser and take part  in the quiz online .

    Q2 . 1) Troposphere or Methanogens 2) decrease 3) -273 ºC 4) pressure will increase 5) K⁻¹ Or α =β/2 =४/3  6) concave mirror 7) at infinite distance 8) R =V/I , ratio of potential difference and current is resistance . 9) Ohm.metre 10) nucleus  11) 1. → iii) F  2. → iv) Mg  3.  →i) Zn  4. → ii) Sn  12) direct current (D.C) 13) K[Au(CN)₂] 14) FeCl₃ +3 NH₄(OH) → Fe(OH)₃↓ +  3NH₄Cl  Or aqueous solution of ammonia ( NH₄OH ) 15) purple colour  16) False 17) 1-propanal 18) CO₂ or CH₃Cl 

Q3 .

 3.1) Two harmful effects of  depletion of ozone layer a) Ultra violet rays directly reach earth surface and causes skin cancer b) UV radiation hinders the growth of plants .

3.2) Here pressure is constant . Initial temperature T₁ = 300K ,initial volume V₁ = 300 cm³ final temperature T₂ = 0ºC = 273K , final volume V₂ = ? . From Charle' law  V₁/T₁ = V₂ /T₂ 

⇒ 300/300 = V₂/273  Or , V₂ = 273  cm³ 

Or Molecular weight of CO₂ = 12 + 2x16 = 44 , 2.2 g of CO₂ = 2.2/44 = 0.05 mole  . From PV =n RT we get 570/760 V = 0.05 x 0.082x 300 ⇒ V = 760 x 0.05 x 0.082 x 300/570 = 1.64 L

3.3) Laws of refraction : a) The incidence ray , the refracted ray and normal at  the incident point all lie in the same  plane .

b) The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant for a pair of two given media and for a particular colour of light . This constant is called the refractive index of the second medium with respect to the first medium .

1​

₁μ₂ = sin i/sin r 

3.4) Resistance is proportional to the length of conductor and inversely proportional to the cross-sectional area of conductor .

Or 

Fleming's left hand rule : 

If we arrange our thumb , forefinger and middle finger of the left hand perpendicular to each other , then the thumb points towards the direction of the force experienced by the conductor , the forefinger points towards the direction of the magnetic field and the middle finger points towards the direction of the electric current .

3.5) 

Or 

CuO is an ionic compound . Cu²⁺ has no filled octet as Cu has 29 electrons. 1s22s22p63s23p64s23d9 is the electron configuration of copper .  Cu²⁺ has electron configurations1s22s22p63s23p64s23d9 = [Ar]3d⁹ But O²⁻ has filled octet. 1s22s22p6 is  the electron configuration of  O²⁻ .

3.6) Comparison between ionic and covalent compound :

Ionic compound	Co-valent compound
1. Occurs during transfer of electrons from one atom to another	1. Occurs when two atoms share their valency electrons
2. Higher melting point	2. Lower melting point

3.7) Balanced equation for ammonia preparation in laboratory :

                                heat 

2NH₄Cl  + Ca(OH)₂ = CaCl₂ + 2H₂O +2NH₃(g) 

Or 

2FeCl₃ +H₂S →2 FeCl₂ + 2HCl + S 

Here H₂S reduces FeCl₃ to FeCl₂ , Hence it acts as reducing agent . 

3.8) 

Mineral	Ore
1. Minarals are the natural inorganic substance that exist in earth crust .	1.Ores are the minarals from which metal can be extracted  economically and conveniently .
2. All minerals  are not ores .	2. All ores are minerals .
3.example ; Clay is the mineral of Aluminium	3. Example : Bauxite and Cryolite are ores of Aluminium
4.Minerals may or may not contain a good percentage of metals	4. Ore always contains a good percentage of metal

3.9 )

Monomer of PVC 

 CH₂ = CHCl vinyl chloride

Monomer of teflon 

CF₂ = CF₂ tetrafluoroethylene.

Or 

C₂H₅OH - Ethanool   and CH₃O CH₃ - dimethayl ether