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Q:

If price of an article decreases from Rs 240 to Rs 220, when quantity demanded increases from 200 units to 210 units. Find point elasticity of demand?

A) 0.6 B) -1.8
C) -0.6 D) 1.8
 
Answer & Explanation Answer: C) -0.6

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Q:

_______ optical data storage is a technology where data is stored in multiple layers in the optical disc.

A) 3D B) 30D
C) 300D D) 3000D
 
Answer & Explanation Answer: A) 3D

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Q:

A body of mass 5 kg accelerates from 12 m/s to 20 m/s in 4 seconds due to the application of a force on it. Calculate the magnitude of this force (in N).

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

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Q:

Gravitational force is maximum at which place

A) Poles B) Tropic of cancer
C) Tropic of capricorn D) Equator
 
Answer & Explanation Answer: A) Poles

Explanation:

Gravitational force is the force that binds everything at the surface of the earth. Gravitational force is maximum at Poles.

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Q:

What is the minimum distance (in metres) required to hear an echo?

A) 10 B) 13
C) 17 D) 21
 
Answer & Explanation Answer: C) 17

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Q:

Why does a fountain pen leak in aeroplane flying at a height?

A) Because of reduced viscosity of the ink in the pen B) Because of increased viscosity of the ink in the pen
C) Because of higher atmospheric pressure outside the pen D) Because of lower atmospheric pressure outside the pen
 
Answer & Explanation Answer: D) Because of lower atmospheric pressure outside the pen

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Q:

Find the resistance (in mega Ω) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200 Ωm.

A) 40 B) 4000
C) 80 D) 2000
 
Answer & Explanation Answer: A) 40

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Q:

Electric power is measured in units of

A) Volt B) Joule
C) Watt D) Ampere
 
Answer & Explanation Answer: C) Watt

Explanation:

Electric power is the rate per unit time, at which electrical energy is transferred by an electric circuit. The power of electricity is measured in watts and kilo watts.

1 Watt is the unit of electrical power equal to one ampere under the pressure of one volt.

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