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Q:

What is the effective resistance (in Ω) of two resistors 21 Ω and 28 Ω connected in parallel?

 

A) 49 B) 24
C) 12 D) 98
 
Answer & Explanation Answer: C) 12

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Q:

It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?

 

A) Law of inertia B) Newton's second law
C) Newton's third law D) Pascal's law
 
Answer & Explanation Answer: C) Newton's third law

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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:

What is the heat released by a heating filament rated 20 W when it is kept on for 2 seconds?

 

A) 40 B) 10
C) 80 D) 20
 
Answer & Explanation Answer: A) 40

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Q:

A plane mirror produces a magnification of

 

 

A) 0 B) +1
C) Infinity D) -1
 
Answer & Explanation Answer: B) +1

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Q:

Which of the following is a bad conductor of heat?

 

A) Wood  B) Diamond
C) Water  D) Mica
 
Answer & Explanation Answer: A) Wood 

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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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