Physics Questions

Q:

If a ball is thrown vertically upwards with a velocity of 40 m/s, then what will be the magnitude of its displacement after 6 s?

A) 80 m B) 40 m
C) 60 m D) 20 m
 
Answer & Explanation Answer: C) 60 m

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Q:

Which of the following Newton's laws of motion can explain why a ball thrown at a wall rebounds?

A) 1st law of motion B) 2nd law of motion
C) 3rd law of motion D) Neither of the laws
 
Answer & Explanation Answer: C) 3rd law of motion

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Q:

The speed of light in vacuum is estimated as ___ meters/second.

A) 3.00 x 108 B) 3.10 x 108
C) 3.12 x 108 D) 3.15 x 108
 
Answer & Explanation Answer: A) 3.00 x 108

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Q:

Why does a piece of cloth, which appears green in sunlight, appear black when it is viewed under red light?

 

A) The cloth completely absorbs red colour wavelength B) It is due to refraction
C) It is the effect of scattering of light D) It is due to Parallax error
 
Answer & Explanation Answer: A) The cloth completely absorbs red colour wavelength

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Q:

In a longitudinal wave, the distance between two consecutive compressions and two consecutive refractions is called

A) Matter B) Wavelength
C) Magnitude D) Energy
 
Answer & Explanation Answer: B) Wavelength

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Q:

Which of the following has the same unit as energy?

A) Work B) Power
C) Density D) Force
 
Answer & Explanation Answer: A) Work

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Q:

The centre of the reflecting surface of a spherical mirror is called the

A) radius B) centre of curvature
C) pole D) focus
 
Answer & Explanation Answer: C) pole

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Q:

In a concave mirror when the object is placed at infinity which of the following applies to the image?

A) Real, inverted, highly enlarged image at center of curvature (C) B) Real, inverted image of the same size at centre of curvature (C)
C) Real, inverted, diminished image between centre of curvature (C) and principal focus (F) D) Real, inverted, highly diminished image at focus
 
Answer & Explanation Answer: D) Real, inverted, highly diminished image at focus

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