General Knowledge - Physics

Exercise :: Physics - Section 1

  • Physics - Section 1
49. 

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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50. 

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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51. 

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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52. 

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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53. 

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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54. 

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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