1.Choose the correct answer:
a) Which is the luminous object :
i) Sun ii) Umbrella iii) Pen iv) Shirt button
b) If the angle of incidence of a light ray is 45º on a plane surface ,then the angle of reflection will be
i) 45º ii) 60º iii) 25º iv) 30º
2.Match the following :
|
Column A |
Column B |
|
Spectrum |
Refraction |
|
Diffuse reflection |
7 colours of light |
|
A pen is looking bent when dipped in water |
Rough surface |
3.Choose the correct answer :
a) A magnetic substance is \
i) plastic scale ii) wooden pencil iii) iron nail
b) Attracting power of magnets are in
i) two ends ii) in the middle iii) only in N pole
4.Write the three important properties of magnet .
5. Fill up the gap with words :( Conventional , non-conventional )
a) Solar energy is the -----------------energy .
b) Coal is the ------------------------energy source .
6. Write three uses of Electrical energy in our daily life .
7. Draw a correct circuit diagram with one bulb , two wires and a switch .
8. Name two substances that are bad conductor of electricity .
9. In primary cell chemical energy is converted into ----------energy .
Ans :
1. a) Sun b)45º 2. Spectrum → 7 Colours of light ,Diffuse reflection → Rough surface , A pen is looking bent when dipped in water → Refraction 3. a) iron nail b) two ends 4. Three important properties of magnets i) Magnet attract magnetic substances( iron, nikel, cobalt) ii) It has directional property i.e it always rests in North-South direction . iii) At the middle of a magnet there is no attracting power . 5. a) non-conventional b) conventional 6. Three uses of electrical energy - light bulb, fan , electrical iron .
7.
8. Bad conductor of electricity - plastic, wood
9. electrical
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