1
Q:

Sound waves can not travel through a

 

A) copper wire placed in air B) silver slab placed in air
C) glass prism placed in water D) wooden hollow pipe placed in vacuum

Answer:   D) wooden hollow pipe placed in vacuum



Explanation:

Sound is a kind of energy created when something vibrates. When this vibration reaches an ear, it is translated into what we recognize as a sound. Sound vibration must travel through matter. Therefore, it can travel through air and water but not through vacuum.

Subject: Physics
Exam Prep: Bank Exams
Q:

Calculate the pressure (in Pa) if a thrust of 750 N is applied to an area of 5 m2.

 

A) 37.5   B) 150  
C) 75   D) 100
 
Answer & Explanation Answer: B) 150  

Explanation:
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0 47331
Q:

Work done by a passenger standing on a platform holding a suitcase weighing 10kg is

A) 980 J B) 98 J
C) 0 J D) 100 J
 
Answer & Explanation Answer: C) 0 J

Explanation:
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2 1298
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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1 976
Q:

What will be the acceleration produced when a force of 21 N is applied on an object of mass 3 kg?

 

A) 0.7 m/s2 B) 7 m/s2
C) 0.007 m/s2 D) 70 m/s2
 
Answer & Explanation Answer: B) 7 m/s2

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1 51123
Q:

What is the upward force exerted by water called?

A) Density B) Buoyant force
C) Gravitation D) Friction
 
Answer & Explanation Answer: B) Buoyant force

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1 1028
Q:

A unit of power is called a

A) Joule B) Pascal
C) Newton D) Watt
 
Answer & Explanation Answer: B) Pascal

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1 942
Q:

A conductor having some appreciable resistance is called a

A) Resistor B) Insulator
C) Conductor D) Semi-conductor
 
Answer & Explanation Answer: A) Resistor

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1 1086
Q:

The sensation of sound persists in the human brain for about:

A) 0.5 sec B) 0.2 sec
C) 0.1 sec D) 1 sec
 
Answer & Explanation Answer: C) 0.1 sec

Explanation:
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0 1008