4
Q:

A cyclist leans inwards when he is negotiating a curve so that

A) he may increase his speed B) his weight may be reduced
C) necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion. D) no frictional force may be produced between the wheels and the axle

Answer:   C) necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.



Explanation:

No circular or curved motion is possible without providing the necessary centripetal force. (C) provides this and so is the answer. 

Subject: Physics
Q:

1 horsepower = approximately _____ watts.

 

A) 746 B) 764
C) 647 D) 674
 
Answer & Explanation Answer: A) 746

Explanation:
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3 84
Q:

Which law of physics states that the force between the two electric charges reduces to a quarter of its former value when the distance between them is doubled?

 

A) Coulomb’s Law B) Stefan's Law
C) Pascal's Law D) Hooke's Law
 
Answer & Explanation Answer: A) Coulomb’s Law

Explanation:
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0 215
Q:

What is the unit of measure of a magnetic field?

A) Cobalt B) Ohm
C) Tesla D) Ampere
 
Answer & Explanation Answer: C) Tesla

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2 191
Q:

_______ expansion makes the Eiffel Tower taller during summers.

 

A) Thermal   B) Chemical  
C) Gravitational   D) Gradient  
 
Answer & Explanation Answer: A) Thermal  

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3 1273
Q:

Georg Simon Ohm in whose honour we have the famous Ohm’s Law, hailed from which country?

 

A) Russia B) Spain
C) Poland D) Germany
 
Answer & Explanation Answer: D) Germany

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1 1348
Q:

Purpose of an optical filter is to

A) reflect lights of different colours B) dispense light into component colours
C) refract light of different colours D) transmit or absorb light of different colours
 
Answer & Explanation Answer: D) transmit or absorb light of different colours

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2 183
Q:

Which of the following statements is/are true about the speed of sound in different media at 25°C


A. In steel, the speed of sound is 5960 m/s
B. In nickel, the speed of sound is 6240 km/s

 

A) Only A is true B) Neither A nor B i s true
C) Both A and B are true D) Only B is true
 
Answer & Explanation Answer: A) Only A is true

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3 224
Q:

Momentum = ..............?

 

A) Mass x Acceleration B) Mass / Volume
C) Mass x Velocity D) Mass x Density
 
Answer & Explanation Answer: C) Mass x Velocity

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2 1122