999+ Physics Questions Answers Explanation MCQ

Q:

During the motion of a projectile fired from the earth surface, _______

A) its kinetic energy remains constant	B) its momentum remains constant
C) vertical component of its velocity remains constant	D) horizontal component of its velocity remains constant

Answer & Explanation Answer: D) horizontal component of its velocity remains constant

Explanation:

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Q:

_____________________ states that the total current entering a junction is equal to the total current leaving the junction.

A) Lenz's Law	B) Hooke's Law
C) Ohm's Law	D) Kirchhoff's First Law

Answer & Explanation Answer: D) Kirchhoff's First Law

Explanation:

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Q:

Find the work done (in J) when a charge of 10 C moves across a potential difference of 2 V.

A) 20	B) 5
C) 40	D) 10

Answer & Explanation Answer: A) 20

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Q:

Which of the following is a device designed to protect electrical devices from voltage spikes?

A) Voltage unloader	B) Surge protector
C) Heat protector	D) Current unloader

Answer & Explanation Answer: B) Surge protector

Explanation:

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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:

What is the process of conversion of solid state directly to gaseous state called?

A) Evaporation	B) Condensation
C) Sublimation	D) Distillation

Answer & Explanation Answer: C) Sublimation

Explanation:

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Q:

Steel is more elastic than Rubber. True or False?

A) TRUE

B) FALSE

Answer & Explanation Answer: A) TRUE

Explanation:

Elasticity is measured as ratio of stress to strain. For a given amount of stress, the strain produced in the steel is comparatively smaller than the strain produced in the rubber.

Therefore, with the help of Young's modulus, it can be concluded that steel has greater elasticity than rubber.

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Q:

A person lifts luggage of 20 kg from the ground and puts it on his head 2 in above the ground. Calculate the work done by him. (g = l0 )

A) 20 J	B) 400J
C) 200J	D) 40J

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