Question # 1

The speed of sound in air does not depend upon

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Temperature

Pressure

Density

Medium

The mass of a body is quantitative measure of its

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Motion

Inertia

Weight

All of these

The dot product of two vectors A and B will be zero, if angle between A and B is

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Zero

30^o

90^o

180^o

The wavelength of X-rays is of the order of.

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10^-8 m

10^-10m

10^-5m

10^-4m

Before the launch of a rocket the mass of fuel of the rocket is approximately consists of.

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60%

50%

80%

100%

The dimension of viscosity are

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[M2L-2T2]

[M-1LT-1]

[M-1L-1T]

[ML-1T-1]

The SI unit of power is

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Joule

Newton

Watt

Kilowatt

One radian is equal to.

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75.3^o

57.3^o

35.7^o

73.3^o

When sound waves enter in different medium, the quantity that remains unchanged is.

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Intensity

Speed

Frequency

Wave length

Two vector can be added by simple arithmetical method when they are at an angle of.

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120^o

90^o

0^o

45^o

Opted unit to measure blood pressure is.

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N/m2

Pascal

mm of Hg

N.m2

If the object is at 5 cm from the lens of simple microscope than its magnifying power will be.

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5

10

15

25

If 332 waves pass through a medium in 1 second with speed of 332 ms-1 then wavelength will be

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7 m

332 m

664 m

1 m

Usually the x-axis is taken as

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Vertical axis

Horizontal axis

+ve axis

-ve axis

A vector is denoted by

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Light face

Bold face

Both a and b

None of these

The efficiency of heat engine whose sink is at 17 ^oC and source at 200 ^oC is.

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38%

63%

80%

90%

Let A = Area of cross section of pipe, v = speed of fluid, then 'Av' is called.

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Volume flow rate

Energy flow rate

Mass flow rate

Pressure flow rate

The units of magnifying power of microscope or telescope are.

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Metre

m^-1

dioptre

No unit

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