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
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