Physics Questions

Q:

A ball is thrown vertically upwards. Assuming the air resistance to be constant and cosiderable:

A) the time of ascent < the time of descent B) the time of ascent > the time of descent
C) the time of ascent = the time of descent D) none of these
 
Answer & Explanation Answer: A) the time of ascent < the time of descent

Explanation:
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Q:

Which is the point from where an azimuth originates?

A) South B) North
C) East D) West
 
Answer & Explanation Answer: B) North

Explanation:

The azimuth originates at true North i.e, the azimuth originates from the north point. It is a measure of how far an object forms the observer's north point.

 

Azimuth is a technical mapping term which is used to describe the direction of an angle between north and south on a compass circle through which the circle line passes. It is the most common military method to express direction. When using an azimuth, the point from which the azimuth originates is the center of an imaginary circle.

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Q:

Which component of an IED creates an electrical charge?

A) activator B) fuse
C) explosive D) power source
 
Answer & Explanation Answer: D) power source

Explanation:

The power source such as a Battery of an IED creates an electrical charge.

 

What are IED's ::

An Improvised Explosive Device (IED) is a bomb constructed and deployed in ways other than in conventional military action. It may be constructed of conventional military explosives, such as an artillery shell, attached to a detonating mechanism. IEDs are commonly used as roadside bombs.

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Q:

What is the full form of "RADAR" ?

A) Radio Detecting and Ranging B) Region Device and Ranging
C) Radio Detect and Rangs D) Radio Device and Ranging
 
Answer & Explanation Answer: A) Radio Detecting and Ranging

Explanation:
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32 9083
Q:

Formation of shadows can be explained by 

A) rectilinear propagation of light B) reflection
C) refraction D) total internal reflection
 
Answer & Explanation Answer: A) rectilinear propagation of light

Explanation:

In this position, the head light will be at the principal focus so that the rays of light falling on the cancave mirror will be rendered parallel

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Q:

The quality of sound produced by an instrument depends on the

A) Frequency B) Intensity
C) Number of overtones D) None of these
 
Answer & Explanation Answer: C) Number of overtones

Explanation:
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Q:

A standing wave occurs when

A) a wave reflects upon itself B) the amplitude of a wave exceeds its wavelength
C) two waves overlap D) the speed of the wave is zero or near zero
 
Answer & Explanation Answer: A) a wave reflects upon itself

Explanation:

A standing wave also known as a stationary wave, is a wave in which its peaks or any other point on the wave do not move spatially.

This phenomenon can occur because the medium is moving in the opposite direction to the wave, or it can arise in a stationary medium as a result of interference between two waves traveling in opposite directions. The most common cause of standing waves is the phenomenon of resonance, in which standing waves occur inside a resonator due to interference between waves reflected back and forth at the resonator's resonant frequency.

 

Hence, standing wave occurs when a wave reflects upon itself.

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Q:

When light enters from air to water, then its 

A) frequency increases and speed decreases B) frequency is same but the wavelength is smaller in water than in air
C) frequency is same but the wavelength is larger in water than in air D) frequency and speed both decreases
 
Answer & Explanation Answer: B) frequency is same but the wavelength is smaller in water than in air

Explanation:
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