Physics - Section 1 (4)

Directions to Solve

Physics - Section 1

25.

Supersonic plane fly with the speed

A.	less than the speed of sound
B.	of sound
C.	greater than the speed of sound
D.	of light

Answer: Option C

Explanation:

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26.

Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

A.	4.2 seconds
B.	42 seconds
C.	4.2 years
D.	42 years

Answer: Option C

Explanation:

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27.

Optical fibre works on the

A.	principle of refraction
B.	total internal reflection
C.	scattering
D.	interference

Answer: Option B

Explanation:

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28.

Mercury is commonly used as a thermometric fluid rather than water because

A.	specific heat of mercury is less than water
B.	specific heat of mercury is more than water
C.	mercury has greater visibility than water
D.	density of mercury is more than the water

Answer: Option C

Explanation:

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29.

Out of the following pairs, which one does not have identical dimension?

A.	Moment of inertia and moment of a force
B.	Work and Torque
C.	Angular momentum and Planck's constant
D.	Impulse and Momentum

Answer: Option A

Explanation:

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30.

Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit

A.	X-rays
B.	ultraviolet light
C.	visible light
D.	radio waves

Answer: Option C

Explanation:

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31.

Radio telescopes are better than optical telescopes because

A.	they can detect faint galaxies which no optical telescope can
B.	they can work even in cloudy conditions
C.	they can work during the day and night
D.	All of the above

Answer: Option D

Explanation:

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32.

Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

A.	at sea level
B.	at the top of Mt. Everest
C.	at a place in a valley below sea level
D.	in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level

Answer: Option C

Explanation:

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