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Q:

Find arc elasticity of demand, if quantity demanded falls from 1000 to 950 when price of the item is increased from Rs. 240 to Rs. 280?

A) 0.33 B) 0.3
C) -0.3 D) -0.33
 
Answer & Explanation Answer: D) -0.33

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Q:

If an electron and a photon have the same wavelength, then they will have the same

A) velocity B) linear momentum
C) angular momentum D) energy
 
Answer & Explanation Answer: B) linear momentum

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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:

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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Q:

As the object covers unequal distances in equal intervals of time, it is said to be in ____________ motion.

A) uniform B) linear
C) non-uniform D) equilibrium
 
Answer & Explanation Answer: C) non-uniform

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Q:

A body in motion essentially acquires

A) Kinetic energy B) Potential energy
C) Mechanical energy D) Heat energy
 
Answer & Explanation Answer: A) Kinetic energy

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Q:

On which principle does the hydraulic lift works?

A) Newton's law B) Pascal's law
C) Archimedes's law D) Joule's law
 
Answer & Explanation Answer: B) Pascal's law

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Q:

The numerical value of a physical quantity is its _______________.

A) vector B) magnitude
C) direction D) property
 
Answer & Explanation Answer: B) magnitude

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