PHYSICS MULTIPLE CHOICE QUESTIONS SET 151

PHYSICS 

MULTIPLE CHOICE QUESTIONS SET 151

1. A device used for converting A.C. into D.C. is called
(a)transformer
(b)rectifier
(c)induction coil
(d)dynamo

2. Energy of Ultraviolet rays is great than
(a)Infrared rays
(b)Gamma rays
(c)X-rays
(d)Cosmic rays

3. The instrument used to measure the speed of the wind is
(a)Altimeter
(b)Anemometer
(c)Chronometer
(d)Dosimeter

4. Who defined the law of gravitation?
(a)Newton
(b)Archimedes
(c)Galileo
(d)Faraday

5. The metal used to make lightning conductors is
(a)Iron
(b)Aluminum
(c)Copper
(d)Zinc

6. A hydrogen balloon floats up because of
(a)air pressure decreases with decrease in height
(b)air pressure decreases with decrease in weight (
c)weight of the balloon is less than the weight of air displaced by it.
(d)the pressure inside the balloon is more than the pressure outside it

7. Which one of the following lenses should be used to correct the defect of astigmatism ? (a)Cylindrical lens
(b)Concave lens
(c)Convex lens
(d)Bifocal lens

8. In a Laser (say neon laser) all the atoms emit the light waves of
(a)Same frequency
(b)Same amplitude
(c)Same phase
(d)All of the above

9. Which of the following has got more heat capacity ?
(a) Iron piece
(b) Water
(c) Gold piece
(d) Benzene

10. If the temperature of a place Increases suddenly the relative humidity
(a)Increases
(b)Decreases
(c)Remains constant
(d)Fluctuates

Answer: 
1 b 
2 a 
3 b 
4 a 
5 c 
6 c 
7 a 
8 d 
9 b 
10 b