Question # 1

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

In a capacitive circuit

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Current leads voltage by phase of π/2

Voltage leads current by phase of π/2

Current and voltage are in same phase

Sometime current and sometime voltage leads

Planck's constant has the dimensions of:

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Energy

Momentum

Frequency

Angular momentum

In an ac circuit with voltage V and current 1 the power dissipated is

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VI

1/2 VI

1/√2 VI

Depends on the phase between V and 1

Mechanical waves on the surface of a liquid are

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Transverse

Longitudinal

Torsional

Both transverse and longitudinal

The average power dissipation in a pure capacitor in AC circuit is

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1/2 CV²

CV²

2CV²

Zero

A force of 10N is acting along y-axis its component along x-axis is

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10N

20N

100N

Zero N

A conducting wire is drawn to double its length Final resistivity of the material will be

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Double of the original one

Half of the original one

One-fourth of the original one

Same as original one

What remains constant in the field of central force?

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Potential energy

Kinetic energy

Angular momentum

Linear momentum

The distance between node and anti-node is

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λ

λ/2

λ/4

2λ

The twinkling of stars is due to

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The fact that stars do not emit light continuously

The refractive index of the earth's atmosphere fluctuate

Intermittent absorption of star light by its own atmosphere

None of them

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