Question # 1

When hot and cold water are mixed, the entropy.

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Decreases

Increases

Remain constant

Zero

A direction of torque is

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Along the position vector r

Perpendicular to both r and f

Along the direction of force F

Opposite to the direction of r

The power needed to lift a mass of 5000 g to height of 1 m in 2 secnd is

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2.45 watt

24.5 watt

245 watt

2.45 watt

When two waves having same frequency traveling in same direction combine, phenomenon is called

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Wave motion

Combination of waves

Interference

Diffraction

The maximum velocity necessary to put a satellite into orbit is

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7.1 kms-1

7.3 kms-1

7.9 kms-1

8,9 kms-1

If the slope of a velocity time graph gradually decreases than body is said to be moving with

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Positive acceleration

Negative acceleration

Uniform velocity

None

Substances that don't flow easily has

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Large co-efficient of viscosity

Small co-efficient of viscosity

Medium co-efficient of viscosity

Zero-coefficient of viscosity

Turning of radio is example of.

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Mechanical resonance

Electrical resonance

Physical resonance

Biological resonance

The to and fro motion of a body is called

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Linear motion

Rotational motion

Vibratory motion

None of these

Bio mass is converted into fuel by

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Evaporation

Fermentation

Reflection

Scattering

When a fore of 100 N is acting on an object along x-axis then its vertical component will be.

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50 N

0 N

25 N

10 N

The ratio of the velocities of wate in a pipe lying horizontally at two ends is 1 : 4 The ratio of diameters of pipe at these two ends is.

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1 : 2

2 : 1

1 : 4

4 : 1

Crests and trough are formed in.

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Longitudinal waves

transverse waves

Stationary waves

Compression waves

The regular or steady flow of fluid is called

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Stream line

Turbulent flow

Average flow

None of these

The magnifying power of an astronomical telescope is 10. If the focal length of objective is 100 cm, then what is the focal length of eye piece.

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10 cm

100 cm

1000 cm

5 cm

The time rate of change of angular displacements called.

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Linear velocity

Linear speed

Angular velocity

Angular speed

Angular frequency is the characteristic of

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Linear motion

Vibratory motion

Circular motion

All of these

The mechanism of transports energy of all the waves is

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Different

Same

Complicated

Easy

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11th Class Part 1 Physics Test Online MCQs With Answers

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