Q:

Which of the following is a characteristic of an exothermic reaction?

A) Release of heat	B) Absorption of heat
C) Doesn't involve any change in temperature	D) None of the option is correct

Answer & Explanation Answer: A) Release of heat

Explanation:

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Q:

A curved mirror where the reflecting surface is curved inwards is called a

A) Concave mirror	B) Plano-convex mirror
C) Plane mirror	D) Convex mirror

Answer & Explanation Answer: A) Concave mirror

Explanation:

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Q:

If I is the current through a wire and e is the charge of an electron, then the number of electrons crossing in t seconds will be given by

A) e/It	B) It/e
C) Ie/t	D) Ite

Answer & Explanation Answer: B) It/e

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Q:

The energy stored in a dry cell is in the form of

A) Potential energy	B) Chemical energy
C) Kinetic energy	D) Nuclear energy

Answer & Explanation Answer: B) Chemical energy

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Q:

Which one of the following is the largest source of electricity in India?

A) Hydropower plants	B) Nuclear power plants
C) Thermal power plants	D) Wind energy

Answer & Explanation Answer: C) Thermal power plants

Explanation:

About 65% of the electricity consumed in India is generated by thermal power plants, 22% by hydroelectric power plants, 3% by nuclear power plants and rest by 10% from other alternate sources like solar, wind, biomass etc.

India is the sixth largest in terms of power generation.

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Q:

___ is known as India's Spice Garden.

A) Rajasthan	B) Kerala
C) Karnataka	D) Maharashtra

Answer & Explanation Answer: B) Kerala

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Q:

If a ball is thrown vertically upwards with a velocity of 40 m/s, then what will be the magnitude of its displacement after 6 s?

A) 80 m	B) 40 m
C) 60 m	D) 20 m

Answer & Explanation Answer: C) 60 m

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Q:

An echo is returned in 3 s. What is the distance of the reflecting surface from the source, considering the speed of sound as $342 {ms}^{- 1}$ ?

A) 513 m	B) 644 m
C) 342 m	D) 171 m

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