Question # 1

The waves in which the particles of the medium are displaced in a direction perpendicular to the direction of propagation of waves are known as

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longitudinal waves

transverse waves

non-mechanical waves

none of them

In metallic crystals which of the following thing remains constant

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amplitude of oscillations

temperature of solid

average atomic positions

all of them

In describing function of digital systems, 1 represents:

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Closed switch

True Statement

Lighted bulb

Only (B) and (C)

All are true

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

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70%

100%

35%

38%

The velocity of sound is greatest in

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Water

Air

Vacuum

Metal

If the velocity of the body decreases non-uniformly then the slope of the velocity-time graph will have

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different values

same values

zero valves

constant valves

A body moving with an acceleration of 5 m/sec²started with velocity of 10 m/sec. What will be the distance traversed in 10 seconds?

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150 m

250 m

350 m

400 m

The life time of metastable state is equal to

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Life time of excited state

Greater than by excited state

Zero

Less than by excited state

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

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1.66 m

1.66 x 10^-10m

1.66 x 10^-29cm

1.66 x 10^-29m

A body of mass 5 kg is acted upon by a total change n momentum will be:

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10 NS

100 NS

140 NS

200 NS

The magnetic field in the middle of a solenoid due to current is

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weak

strong and uniform

none-uniform

zero

For a circular orbit, the satellite has speed of

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20,000 kmh^-1

25,000 kmh^-1

26,000 kmh^-1

27,000 kmh^-1

The speed of commercial jet (air liner) is

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200 ms^-1

267 ms^-1

327 ms^-1

335 ms^-1

When the lift is falling freely under gravity, then

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T = W - mg

T - W = ma

T = 0

None of these

While viewing a distant object with a telescope suddenly a housefly sits on objective lens.The correct statement is that

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Housefly will be seen enlarged in image

Housefly will be seen reduced in image

Intensity of image will be decreased

Intensity of image will be increased

An airplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m.When it is vertically above a point A on the ground a bomb is released from it.The bomb strikes the ground at point B.The distance AB is

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1200 m

0.33 km

3.33 km

33 km

When a body acquired terminal velocity falling in a viscous medium than the acceleration

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a = -ve

a = +ve

a = g

a = zero

Thermal and mechanical equilibrium is maintained all the time so that each process is

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Reversible

Perfectly reversible

Irreversible

None of these

When the velocity of a body is decreasing, the acceleration produced is

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Positive acceleration

Negative acceleration

No acceleration produced

None of these

A certain force F increases the length of a wire by 1 mm. The force required to increase its length by 2mm is

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2 F

4 F

8 F

16 F

The maximum range of the projectile is the horizontal distance covered is

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Maximum

Distance

Minimum

None of these

The conductivities of conductors (metals) have

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10⁵ (Ω)^-1

10⁷ (Ωm)^-1

10⁸ (Ωm)^-1

10⁹ (Ωm)^-1

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