Question # 1

If the acceleration of a body is negative, then slope of the velocity-time graph will be:

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Zero

Positive

Negative

Infinity

The vibrations of factory floor caused by the running of heavy machinery is an example of

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free vibration

natural vibrations

forced vibrations

all of them

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic field

Constant electric field

None of these

The unit of work in CGS system is

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Joule

Erg

Dyne

Watt

When two spherical conducting balls at different potentials are joined by a metallic wire, after some time:

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Both the conductors are at the same potential

Potential difference across the conductors remain constant

Potential difference across the conductors becomes zero

Both (A) and (B)

Both (A) and (C)

If a body reaches a speed equal to the speed of light, then its mass will became

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zero

very small

infinity

none of these

Weber is a unit of

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magnetic flux

magnetic filed intensity

magnetic induction

magnetic flux density

Real gases strictly obey gas law at:

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High pressure and low temperatures

Low pressures and high temperatures

High pressures and high temperatures

None of these

Bernoulli's equation is applicable for

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turbulent flow

streamline flow

both (a) and (b)

all kinds of flows

Xerography means:

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Dry writing

Wet writing

Poor writing

Excellent writing

Both (A) and (B)

In the phenomenon of hysteresis

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magnetism leads the magnetising current

magnetism lags behind the magnetising current

meganetism goes along the magnetising current

none of them

One light year = ______.

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9.5 x 10^-15m

9.5 x 10¹⁵m

9.5 x 10^-12m

9.5 x 10¹²m

A ball is dropped from a certain height and another ball is projected horizontally from the same point.Which of the following statements is correct?

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Both hit the ground at the same velocity

Both hit the ground at the same speed

The change of velocity during the path for both balls is the same

The change of speed during the path for both balls is the same.

Slope of displacement time graph gives

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Instantaneous velocity

Instantaneous acceleration

Work done

Force

The approximate efficiency of dry cell battery is

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80%

90%

70%

50%

If 5000 lines per cm are ruled on different on a diffraction grating then the slit spacing will be

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5 x 10^-3A°

2 x 10^-4A°

5 x 10^-5A°

2 x 10⁴A°

Distance covered by a freely falling body in one second is

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9.8m

4.9m

2.7m

3.9m

No entropy change is associated with:

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Isothermal

Adiabatic process

Isobaric process

None of them

In place of spark plug, the diesel engine requires also

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High speed air

High temperature air

Low temperature air

None of these

The low blood pressure is known as

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Diastolic

Systolic

Low blood pressure

None of these

By convention, the torques are taken as positive if they are in the

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upward direction

rightward direction

clockwise direction

anticlockwise direction

With a graded index fibre, the overall time difference between all the wavelengths arrived at the other end may be about

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1 ns per km

10 ns per km

43 s per km

33 ns per km

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