Question # 1

A current of 1.6 A is passed through a solution of CuSO_{4. How many Cu}²⁺ions are liberated in one minute?

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3 x 10²⁰

3 x 10¹⁰

6 x 10²⁰

6 x 10¹⁰

In case of point, source of light shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

If the distance between two charges is doubled,the force between them will become:

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Double

Half

One third

One fourth

Centripetal acceleration is also called ______ acceleration:

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Tangential

Radial

Angular

None of them

Which of the following can become a good temporarily magnet

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iron

steel

both of them

none of them

To make an LED, it is impreacticable to use:

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Silicon

Gallium arsenide

Gallium arsenide phosphide

Iron

Both (B) and (C)

The dot product of electric field intensity E and vector area A is called

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Electric potential

Electric flux

Electric field

Magnetic field

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

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10Ω

20Ω

30Ω

40Ω

In a container having water filled up to a height h, a hole is made in the bottom. The velocity of water flowing out of the hole is

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Independent of h

Proportional to h^1/2

Proportional to h

Proportional to h²

According to the Bernoulli's equation, where the speed of the fluid is high, the pressure will be

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low

zero

high

all of them

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

When sunlight falls on a soap bubble (film), it appears coloured because of

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interference of light

dispersion of light

polarization of light

diffraction of light

The unit vectors is not restricted to Cartesian coordinate system only. Unit vectors may have

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Specific direction

Any direction

Not a and b

None of these

Which one is the case when the wavelength is actually changed?

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When source move relative to observer

When observer move relative to source

When observer moves around a stationary source at the center of circle

When the relative displacement between source and observer is zero

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

In which of the following, Doppler’s effect is not applicable?

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To find speed of satellite

To find objects under water

To find speed of star

To tune a musical instrument

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r

r²

r³

None of these

The two forces of a couple do not follow the rule that

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They act on the same angle

They act in the opposite directions

They have same directions

They cancel out each other

N-type crystal is

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Neutral

Positively charged

Negative charged

None of these

Essential characteristic of equilibrium is:

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Momentum equal to zero

Acceleration equal to zero

Kinetic energy equal to zero

Velocity equal to zero

Velocity of a body changes if

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direction of motion the body changes

speed of the body changes

neither speed nor direction changes

either speed or direction changes

A ball tied to the end of a string is swing into a vertical loop then the tension will be maximum at the

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Highest point

Bottom point

Neither at top nor at bottom

None of these

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