Q:

Atoms have no electric charge because they

A) have same number of electrons and neutrons	B) have same number of electrons and protons
C) have same number of protons and neutrons	D) have same number of protons, electrons and neutrons

Answer & Explanation Answer: B) have same number of electrons and protons

Explanation:

Atoms are composed of three main particles called electrons, protons and neutrons. We know that, the electrons are negatively charged particles whereas protons are positively charged and neutrons have no charge.

Hence, as the number of electrons and protons are equal and they are oppositely charged, the atom will have no charge as their charges cancel each other.

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Q:

Brownish film formed on iron when left in open is called?

A) Dust	B) Shovel
C) Spade	D) Rust

Answer & Explanation Answer: D) Rust

Explanation:

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Q:

Improve the bracketed part of the sentence.
By rescuing the child from fire, the local resident (added another feather to his cap.)

A) made a significant achievement	B) was gifted with precious thing
C) was crowned and rewarded	D) No improvement

Answer & Explanation Answer: A) made a significant achievement

Explanation:

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Q:

Which amongst the following is not a component of monetary policy in India?

A) Repo rate	B) Moral suasion
C) Credit Rationing	D) Public Debt

Answer & Explanation Answer: D) Public Debt

Explanation:

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Q:

Which gas is a source of natural groundwater pollution?

A) Helium	B) Krypton
C) Radon	D) Argon

Answer & Explanation Answer: C) Radon

Explanation:

Radon gas is a source of natural groundwater pollution.

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Q:

Collisions occur at curves because

A) speed on the approach is too great	B) speed leaving the curve is not enough
C) speed leaving the curve is too great	D) speed on the approach is not enough

Answer & Explanation Answer: A) speed on the approach is too great

Explanation:

Collisions occur at curves because speed on the approach is too great.

Collisions_occur_at_curves_because1560944223.jpg image

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Q:

The force exerted on an object is 200 N and its mass is 100 kg. Find the acceleration of the object.

A) 2 m/s	B) 2 m
C) 2 m/sq.s	D) 2 s

Answer & Explanation Answer: C) 2 m/sq.s

Explanation:

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Q:

An electron and a proton starting from rest get accelerated through potential difference of 100kV. The final speeds of the electron and the proton are Ve and Vp respectively. Which of the following relations is correct?

A) Ve > Vp	B) Ve < Vp
C) Ve = Vp	D) Cannot be determined

Answer & Explanation Answer: A) Ve > Vp

Explanation:

Both when accelerated through a potential difference of 100KV, they will have the same energy. The mass of the electron is less than the mass of a proton, hence it will move faster(momentum).

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