Question # 1

At a certain instant a stationary transverse wave is found to have maximum kinetic energy the appearance of string of that instant is:

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Sinusoidal shape with amplitude A/3

Sinusoidal shape with amplitude A/2

Sinusoidal shape with amplitude A

Straight line

In LCR series AC circuit the phase angle between current and voltage is

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Any angle between 0 and ±π/2

π/2

π

Any angle between 0 and π/2

A particle is moving in a uniform magnetic field then

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Its momentum changes but total energy remains the same

Both momentum and total energy remains the same

Both changes

Total energy change but momentum remains

The time period of a simple pendulum is 2 seconds if its length is increased by 4 times then its period becomes

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16 s

12 s

8 s

4 s

Blood has a density

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Equal to water

Greater then water

Lesser then water

None of these

Copper and germanium are cooled to 70 K from room temperature then

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Resistance of copper increases while that of germanium decreases

Resistance of copper decreases while that of germanium increases

Resistance of both decreases

Resistance of both increases

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly Proportional to its temperature

Inversely proportional to its temperature

A conducting wire is drawn to double its length Final resistivity of the material will be

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Double of the original one

Half of the original one

One-fourth of the original one

Same as original one

The average power dissipation in a pure capacitor in AC circuit is

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1/2 CV²

CV²

2CV²

Zero

In a simple harmonic motion the kinetic energy (KE) and the potential energy (PE), are such that throughout the motion

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KE remains constant

PE remains constant

KE/PE is constant

KE + PE remains constant

The temperature at which the speed of sound becomes double as was at 27°C is

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273°C

0°C

927°C

1027°C

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Viscous force exerted by air

Surface tension effect

Air currents atmosphere

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

If a diamagnetic substance is brought near north or south pole of a bar magnet it is

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Attracted by the poles

Repelled by the poles

Repelled by north pole and attracted by the south pole

Attracted by the north pole and repelled by the south pole

A 220 V, 50 Hz. A.C. source is connected to an inductance of 0.2 H and a resistance of 20 ohm in series. What is the current in the circuit?

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10 A

5 A

33.3 A

3.33 A

A prism splits a beam of white light into its seven constituent colors. This is so because

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Phase of different colors is different

Amplitude of different colors is different

Energy of different colors is different

Velocity of different colors is different

When light wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however, light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters?

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1 : 2

2 : 1

4 : 1

1 : 4

How does the Young's modulus vary with the increase of temperature?

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Decrease

Increases

Remains constant

First increases and then decreases

The unit of electric current 'ampere' is the amount of current flowing through each of two parallel wires 1 m apart and of infinite length will give rise to a force between them equal to

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1 N/m

2 x 10^-7N/m

1 x 10^-2N/m

4 x 10²N/m

Steel is preferred for making springs over copper. Why?

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Steel is cheaper

Young's modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely ot be oxidized

How much water a pump of 2kW can raise in one minute to a height of 10 m, take g = 10 m/s²?

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1000 liters

1200 liters

100 liters

2000 liters

Ultra-violet radiation of 6.2 eV falls on an aluminium surface. K.E. of fastest electron emitted is (Work function = 4.2 eV)

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3.2 x 10-21 J

3.2 x 10-19 J

7 x 10-25 J

9 x 10-32 J

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