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Q:

Insulators have resistivity of the order of 

A) 106 Ω m to 108 Ω m B) 10-12 Ω m to 10-17 Ω m
C) 10-8 Ω m to 10-6 Ω m D) 1012 Ω m to 1017 Ω m
 
Answer & Explanation Answer: D) 1012 Ω m to 1017 Ω m

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Q:

Acceleration due to gravity on a planet decreases with ______.

A) decrease in radius of the planet B) increase in mass of the planet
C) decrease in mass of the body D) increase in altitude from surface of the planet
 
Answer & Explanation Answer: D) increase in altitude from surface of the planet

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Q:

'Gallon' is commonly used

A) To refer to speed B) To refer to a container
C) As a measure of volume D) To express containers in terms of barrel
 
Answer & Explanation Answer: C) As a measure of volume

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Q:

In an optical fibre the signal is transmitted

A) in a straight line path B) In a curved path
C) due to total internal reflection D) Due to refraction
 
Answer & Explanation Answer: D) Due to refraction

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Q:

If a body takes 't' seconds to go once round the circular path of radius 'r', the velocity 'v' is given by

A) v=t2πr B) v=2πrt
C) v=2πr2t D) v=πr2t
 
Answer & Explanation Answer: B) v=2πrt

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Q:

Find the power of a convex lens if the image formed is at a distance of 25 cm from the lens when the object is placed on the other side of the lens at 12 cm from the optical centre?

A) -4.33 diopters B) 12.33 diopters
C) -12.33 diopters D) 4.33 diopters
 
Answer & Explanation Answer: B) 12.33 diopters

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Q:

A body in equilibrium _______.

A) can move with constant acceleration B) is always at rest
C) can move with constant velocity D) can move with variable acceleration
 
Answer & Explanation Answer: C) can move with constant velocity

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Q:

If an object is placed at the center of curvature of a concave mirror, then the image formed will be

A) virtual and enlarged B) virtual and diminished
C) real and of the same size D) real and enlarged
 
Answer & Explanation Answer: C) real and of the same size

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