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Q:

An example of longitudinal waves (in gas as a medium) is ______.

A) heat waves B) radio waves
C) electromagnetic waves D) sound waves
 
Answer & Explanation Answer: D) sound waves

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Q:

Which of the following is a renewable source of energy?

A) Coal B) Petroleum
C) Plant D) Natural Gas
 
Answer & Explanation Answer: C) Plant

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Q:

A wooden block of mass m1 kg accelerates at m/s when a force of 5 N acts on it. Another block of mass m2 kg accelerates at 20 m/s when the same force acts on it. If both the blocks are tied together and the same force acts on their combination, the acceleration will be about

 

A) 6.67 m/s2 B) 1.67 m/s2
C) 5.67 m/s2 D) 4.67 m/s2
 
Answer & Explanation Answer: A) 6.67 m/s2

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Q:

A sound wave has a frequency of 4 kHz and a wavelength of 40 cm. The time taken by the sound wave to travel a distance of 3.2 km is

A) 0.5 s B) 2.0 s
C) 4.0 s D) 1.0 s
 
Answer & Explanation Answer: B) 2.0 s

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Q:

While watching 3D movies at the theater, we have to wear special glasses because?

A) The glasses allow our left and right eyes to see different images B) 3-D movies use special colors which cannot be sensed by the human eye
C) 3-D movies are brighter than ordinary movies and can hurt our eyes if seen directly D) The glasses allow both the eyes to see similar images
 
Answer & Explanation Answer: A) The glasses allow our left and right eyes to see different images

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Q:

 During the night, the direction of the wind would be from the __________________.

A) valleys to the mountains   B) mountains to the valleys
C) land to the sea D) sea to the land
 
Answer & Explanation Answer: C) land to the sea

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Q:

If the resistance of a conductor is reduced to half its initial value, then the heating effect in the conductor will become ___.

A) half B) double
C) one-fourth D) four-times
 
Answer & Explanation Answer: A) half

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Q:

Which of the following is not a vector quantity?

A) Work B) Force
C) Displacement D) Velocity
 
Answer & Explanation Answer: A) Work

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