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Q:

Which of the following is not true about Frictional force?

 

A) Friction is the force which opposes the relative motion of two surfaces in contact B) The force of friction that acts when a body is moving (sliding) on a surface is called sliding friction
C) Friction in machines wastes energy and also causes wear and tear D) Rolling friction is much more than sliding friction, the use of ball bearings in a machine considerably reduces friction
 
Answer & Explanation Answer: D) Rolling friction is much more than sliding friction, the use of ball bearings in a machine considerably reduces friction

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Q:

What is measured with the Nephometer?

 

A) volume of rainfall B) Cloud volume and speed
C) Salinity of Sea D) All options are correct.
 
Answer & Explanation Answer: B) Cloud volume and speed

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Q:

Which of the following statements is/are INCORRECT?

 

A. The value of G on the moon is equal to that on the earth.

B. 26.68 x 10-11 N is the force of gravitation between two point masses of 2 kg and 2kg kept 1 m apart.

C. Newton's law of gravitation is valid in the laboratory only.

D. Force is inversely proportional to the square of the distance between two bodies.

 

A) B, C and D B) C and D only
C) Only C D) Only A
 
Answer & Explanation Answer: C) Only C

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Q:

Any body kept in a fluid experiences an upward force called _____________.

 

A) torque B) moment
C) pressure D) upthrust
 
Answer & Explanation Answer: D) upthrust

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Q:

Which type of fault is under compression?

 

 

A) shear B) normal
C) reverse D) strike-slip
 
Answer & Explanation Answer: C) reverse

Explanation:

Reverse faults occur in areas undergoing compression. In a reverse fault, the block above the fault moves up relative to the block below the fault.

 

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Q:

The magnitude of the gravitational force will be equal to the _________.

 

A) product of mass and acceleration due to the gravitational force   B) ratio of mass and acceleration due to the gravitational force
C) ratio of acceleration due to the gravitational force and mass D) reciprocal of product of mass and acceleration due to the gravitational force  
 
Answer & Explanation Answer: A) product of mass and acceleration due to the gravitational force  

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Q:

A forensic tool used to identify the chemical makeup?

 

A) calibur B) lie detector
C) gas chromatograph D) ballistics
 
Answer & Explanation Answer: C) gas chromatograph

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Q:

Which one of the following is applicable to collision-coalescence process of precipitation?

 

A) Clouds which do not extend beyond the freezing level B) Clouds which extend beyond the freezing level
C) All types of clouds D) Cirrocumulus cloud
 
Answer & Explanation Answer: A) Clouds which do not extend beyond the freezing level

Explanation:

In colder clouds: droplets formed by Bergeron mechanism. But, in many parts of the world the air is too warm for ice crystals to form. This being the case, rain and snow cannot develop following the Bergeron Process. Instead, tiny droplets form as they collide into one another creating larger and larger droplet, this is known as collision-coalescence process. So, warmer clouds are associated with this keyword.

 

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