General Science-56

1. By which one of the following, an old written material which cannot be read easily, can be read?
a. alpha rays
b. gamma rays
c. X-rays
d. IR- rays

2. A mirror produces magnified erect image of an object. The nature of the mirror is
a. Convex
b. Concave
c. Plane
d. Neither convex nor concave

3. Why are the inner lining of hot water made up of copper?
a. copper has less heat capacity
b. copper has high  electrical conductivity
c. copper does not react with steam
d. copper is good conductor of both heat and electricity

4. A coin immersed in water pond appears to be raised when view from the top. What is this due to?
a. Total internal reflection of light
b. Refraction of light
c. Scattering of light
d. Reflection of light

5. Which of the following wavelengths will suffer maximum deviation while passing through a prism?
a. Orange
b. Red
c. Green
d. Violet

6. Cavitations is a special application property exhibited only by
a. audible sound
b. infrasonic
c. ultrasonic
d. electromagnetic waves

7. A radar beam is sent onto a moving airplane in opposite direction of its approach. In which of these ways it will be affected?
a. Its wavelength decreases
b. Its wavelength increases
c. It remains unaffected
d. none of these

8. Which one of the following can convert the alternating current into the direct current?
a. Transformer
b. Motor
c. Dynamo
d. Rectifier

9. Power of two bulbs are 50 W and 100 W which are connected in series. Then 50 W bulb will
a. glow brighter
b. glow less than 100 Watt bulb
c. glow dim
d. not glow

10. The phenomenon of bursting of hydrogen balloon is based on
a. Charles’s law
b. Boyle's law
c. Henry's law
d. Bernoulli's theorem