Question # 1

The magnitude of chemical Effects depends upon:

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Nature of liquid

Quantity of Electricity passed through the liquid

Color of the liquid

Both (A) and (C)

Both (A) and (B)

At higher frequency of the alternating current, the capacitive reactance X_c

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Increases

Decreases

Remains the same

Increases only when the voltage increases

Velocity of sound in a diatomic as is 300 m/sec. what is its rms velocity?

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400 m/sec

40 m/sec

430 m/sec

300 m/sec

At ordinary temperature, an increase in temperature increases the conductivity of

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Conductor

Semiconductor

Insulator

Alloy

In series RC circuit when R=X_c, then the phase angle is

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0°

90°

70°

45°

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Air currents of the earth atmosphere

Surface tension effect

Viscous force exerted by air

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

A lift is moving up with acceleration equal to 1/5 of that due to gravity. The apparent weight of a 60 kg man standing in lift is

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60 kg wt

72 kg wt

48 kg wt

Zero

Angular momentum is a:

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vector quantity

Imaginary quantity

Complex Quantity

Scalar Quantity

Whenever a covalent bond breaks, it creates:

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An electron

A hole

An electron-hole pair

A positron

All of these

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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1.66 x 10^-29m

1.74 x 10^-10cm

17.4 x 10^-6m

1.74 x 10^-10m

Most motorbikes have ____________ cylinder/s engine but cars usually have _________ cylinders on the same crankshaft.

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Four , Six

One , four

two , five

None of these

When brakes are applied to a fast moving car, the passengers will be thrown:

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Forward

Backward

Downward

None of these

The nature of thermal radiation is similar to:

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Ultraviolet rays

Light rays

Both of them

None of them

The amount of work done in bringing a unit positive charge from infinity to a point is called

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Potential

Potential difference

Absolute potential

None of these

There are two electric bulbs of 40 W and 100 W. They are first connected in series and then in parallel across a source:

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40W bulb will be brighter in series and 100W in parallel

100W bulb will be brighter in series and 40W in parallel

40W bulb will be brighter in both the cares

100W bulb will be brighter in both the cares

In full wave rectification, the output D.C. voltage across the load is obtainedfor

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The positive half cycle of input A.C. (C) The complete cycle of input A.C.

The negative half cycle of input A.C.

The complete cycle of

All of the above

A straight current carrying conductor experiences maximum forces in a uniform magnetic field when it is placed:

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Parallel to the field

Perpendicular o the field

At an angle of 45 to the field

None of these

The terminal velocity of a drop of water of radius 1 x 10^-3 m moving through air (Given that h = 19 x 10^-6 kgm^-1s^-1)

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114.6 ms^-1

114.6 kms^-1

11.46 ms^-1

1.146 ms^-1

If drag force is given by F = krv what could be the SI units of k

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kgm²s^-1

kgm^-2s^-2

kgm^-1s^-1

kgms^-1

Substances which undergo plastic deformation until they break, are known as

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brittle substances

ductile substances

plastic substances

neither of them

When m₁= m₂, the velocities of both bodies become

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V'₁= V₂and V₁= -V'₂

V'₂= -V₁and V₁= V'₂

V'₁= V₂and V'₂= V₁

None of these

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