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Q:

What is the duration of the world’s shortest X–ray laser has been successfully created by the scientists?

 

A) 39 nanoseconds B) 43 attoseconds
C) 15 picoseconds D) 57 microseconds
 
Answer & Explanation Answer: B) 43 attoseconds

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Q:

The mass per unit volume is called

A) Force B) Work
C) Density D) Pressure
 
Answer & Explanation Answer: C) Density

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Q:

Which of the following can do more work?

A) A rotating wheel B) A moving bullet
C) A speeding stone D) A raised hammer
 
Answer & Explanation Answer: B) A moving bullet

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Q:

What is the direction of torque?

A) Perpendicular to the direction of applied force B) Same as the direction of applied force
C) Opposite to the direction of applied force D) Parallel to the radius
 
Answer & Explanation Answer: A) Perpendicular to the direction of applied force

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Q:

When the car takes a bend, the force that pushes us to the outside of the curve is the

A) Centripetal Force B) Centrifugal Force
C) Frictional Force D) Tension Force
 
Answer & Explanation Answer: B) Centrifugal Force

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Q:

The attenuation in optical fibre is mainly due to

A) Scattering B) Absorption
C) Both (a) and (b) D) Neither absorption nor scattering
 
Answer & Explanation Answer: A) Scattering

Explanation:

The reason for transmitting data over optical fibers, is because the speed of data transmission through optical wires are equal to the speed of light. The intense speed of data transfer speed, has lead to the use of optical fibers. The optical fiber uses the technology of transferring light beams, from one end to the other end of optical cables. The attenuation in optical fiber is due to Scattering. The reason why scattering is caused, due to the folding, in the wire.

 

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Q:

Name the type of mirror used in the headlight of vehicles

A) Plano-convex mirror B) Convex mirror
C) Plane mirror D) Concave mirror
 
Answer & Explanation Answer: D) Concave mirror

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Q:

Calculate the work done by the force of gravity when a satellite moves in an orbit of radius 40,000 km around the earth.

A) 8,000 J B) 4,00,000 J
C) 0 J D) 4,000 J
 
Answer & Explanation Answer: C) 0 J

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