All MCQs for Competitive Exams

1

Which method is most effective for separating a mixture of camphor and benzoic acid?

A

Fractional crystallization

B

Chemical method

C

Sublimation

D

Extraction with solvent

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2

The separation of two substances via fractional crystallization is primarily based on differences in which physical property?

A

Densities

B

Volatility

C

Solubility

D

Crystalline shape

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3

The mass m of the largest stone that can be moved by flowing water depends upon the density ρ of water, acceleration due to gravity g and velocity of flow u, then m ∝ ?

A

ρ g

B

u^6

C

u^2

D

u^8

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4

Which quantity has different dimensions:

A

Pressure

B

Work

C

Energy

D

Torque

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5

Dimensions are the same for:

A

Work and energy

B

Force and weight

C

None of these

D

Both A and B are correct

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6

The dimensions of torque are:

A

[ML^{2}T^{-2}]

B

[LT^{-1}]

C

[ML^{2}T^{1}]

D

[MLT^{-2}]

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7

The dimensions of angular velocity are:

A

[L T]

B

[L T^2]

C

[L]

D

[T^-1]

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8

The unit of viscosity in CGS system is poise (P), that in SI is Poiseuille (Pl). Which of the following statements is correct?

A

10 P = 1 Pl

B

1 P = 10 Pl

C

1 P = 100 Pl

D

None of these

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9

Dimensions of G are:

A

[M L^{-3} T^{2}]

B

[M^{-1} L^{3} T^{-2}]

C

[M^{2} L T^{3}]

D

None of these

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10

Which of the following pair of physical quantities have the same dimensions?

A

Momentum and pressure

B

Force and surface tension

C

Energy and work

D

Linear and angular momentum

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