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 Physics Questions

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Q:

Light is a ______________ wave.

 

A) longitudinal B) elastic
C) transverse D) mechanical
 
Answer & Explanation Answer: C) transverse

Explanation:
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Q:

According to ohm's law, which of the following is true?

 

A) The current flowing through a wire is directly proportional to the Potential Difference applied across its ends B) The current flowing through a wire is directly proportional to its resistance
C) The current flowing through a wire is indirectly proportional to its length D) The current flowing through the wire is indirectly proportional to the Potential Difference applied across its ends  
 
Answer & Explanation Answer: A) The current flowing through a wire is directly proportional to the Potential Difference applied across its ends

Explanation:
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Q:

Temperature can be expressed as derived quantity in terms of any of the following

A) length and mass B) mass and time
C) length,mass and time D) in terms of none
 
Answer & Explanation Answer: D) in terms of none

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Q:

The instrument that measures the wind speed is called __________________.

 

A) an anemometer B) an odometer
C) a manomete D) a barometer
 
Answer & Explanation Answer: A) an anemometer

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Q:

A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will

A) increase B) decrease
C) remain unaffected D) have its shape changed
 
Answer & Explanation Answer: A) increase

Explanation:

The metal ball can be considered  to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase.

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Q:

Match the following with the correct response.

 

(1) W (A) Nm
(2) kW       (B) 3.6 x 106 J
(3) 1 kW-h (C) 1000 W
(4) 1 HP (D) 746 W

A) 1-D, 2-B, 3-C, 4-A B) 1-A, 2-B, 3-C, 4-D
C) 1-A, 2-C, 3-D, 4-B D) 1-A, 2-C, 3-B, 4-D
 
Answer & Explanation Answer: D) 1-A, 2-C, 3-B, 4-D

Explanation:
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Q:

It is more difficult to walk on ice than on a concrete road because 

A) there is very little friction between the ice and feet pressing it B) ice is soft when compared to concrete
C) there is more friction between the ice and feer D) None of these
 
Answer & Explanation Answer: A) there is very little friction between the ice and feet pressing it

Explanation:

It is the friction between the feet and the ground that helps us to walk. Without this friction we would slip and fall

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Q:

Rain drops acquire spherical shape due to 

A) viscosity B) surface tension
C) friction D) elasticity
 
Answer & Explanation Answer: B) surface tension

Explanation:

The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area. This surface tension is the "skin" of a body of water that makes the molecules stick together.

                                 Rain_drops_acquire_spherical_shape_due_to1558074071.png image 

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