Q:

Consider the following statements :

1. There is no net moment on a body which is in equilibrium.

2. The momentum of a body is always conserved.

3. The kinetic energy of an object is always conserved.

Which of the statements given above is/are correct?

A) 1, 2 and 3	B) 2 and 3 only
C) 1 and 2 only	D) 1 only

Answer & Explanation Answer: C) 1 and 2 only

Explanation:

There are two conditions that must be met for an object to be in equilibrium. The first condition is that the net force on the object must be zero for the object to be in equilibrium. If net force is zero, then net force along any direction is zero.

Kinetic energy (KE) is the energy of motion, and kinetic energy is not always conserved in a collision

Energy and momentum are always conserved.

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Q:

Match the following.

A) I – 2, II – 3, III – 1	B) I – 1, II – 3, III – 2
C) I – 2, II – 1, III – 3	D) I – 3, II – 2, III – 1

Answer & Explanation Answer: D) I – 3, II – 2, III – 1

Explanation:

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Q:

Which of the following statement(s) is/are INCORRECT?

I. Alkenes are fairly unreactive.

II. Alkenes burn with blue flame.

III. Alkanes burn with yellow flame.

A) Only I and II	B) Only I and III
C) Only II and III	D) All I, II and III

Answer & Explanation Answer: D) All I, II and III

Explanation:

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Q:

By volume, 21% of air is _______________.

A) hydrogen	B) oxygen
C) nitrogen	D) carbon dioxide

Answer & Explanation Answer: B) oxygen

Explanation:

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Q:

The absence of law and order

A) Mutiny	B) Rebellion
C) Revolt	D) Anarchy

Answer & Explanation Answer: D) Anarchy

Explanation:

Anarchy is what the absence of law and order i.e, government and freedom of an individual.

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Q:

Which of the following statements about the reaction below are INCORRECT?

$2 Pb + C \to 2 Pb + {CO}_{2}$

A. Carbon di-oxide is getting, oxidised
B. Lead is getting reduced
C. Carbon is oxidised
D. Lead oxide is getting reduced

A) A and C	B) A and B
C) B and C	D) A, B and C

Answer & Explanation Answer: B) A and B

Explanation:

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Q:

Metals are generally ______.

I. Ductile

II. Malleable

III. Poor conductors of heat

A) Only I and II	B) Only I and III
C) Only II and III	D) All I, II and III

Answer & Explanation Answer: A) Only I and II

Explanation:

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Q:

The most reactive of the following metals is

A) Al	B) Ca
C) Ni	D) Pb

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