light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

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set 16

Question : 16

An optician while testing the eyes finds the vision of a patient to be 6/12. By this he means that

a) the person can read the letters of 6 m which the normal eye can read from 12 m

b) the person can read the letters of 6 inches from a distance of 12 m

c) the person can read the letters of 12 inches from 6 m

d) the focal length of eye lens had become half that of the normal eye

Answer: (a)

Question : 17

What should be refractive index of a transparent medium to be invisible in vacuum?

a) > 1

b) 1

c) < 1

d) None of these

Answer: (b)

To be invisible in vacuum, µ of medium must be equal to µ of vacuum, which is 1.

Question : 18 [UPPCS (Mains) 2007]

To hear a clear echo, the minimum distance between the reflecting surface and the observer should be

a) 165 metre

b) 16.5 feet

c) 165 feet

d) 16.5 metre

Answer: (d)

Question : 19 [IAS (Pre) 2003]

A hydrogen inflated polythene balloon is released from the surface of the Earth. As the balloon rises to an altitude up in the atmosphere, it will

a) Flatten into disc like shape

b) Increase in size

c) Decrease in size

d) Maintain the same size and shape

Answer: (b)

Question : 20 [UPPCS (Pre) 1995]

When a bottle is filled with water and it is freezing the bottle breaks down, because

a) Bottle shrinks at freezing point

b) The temperature outside the bottle is higher than inside

c) Water expands upon freezing

d) Water expands on heating

Answer: (c)

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