Question # 1

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

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The charge in the plates reduces and potential difference increase

Potential difference between the plates increase, stored energy decreases and charge remains the same

Potential difference between the plates decreases and charge remains unchanged

None of the above

The vibratory or oscillatory motion of a body is

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translatory motion

back and forth motion about its mean position

free all motion

circular motion

Field lines are closer to each other in the region where the filed is

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Stronger

Weaker

Much weaker

Absent

None of these

A dirty carpet is to be cleaned by heating. This is an accordance with____ law of motion:

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First

Second

Third

None of these

Referring to above figure, due to change in current in the coil P, the change in magnetic flux:

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Is associated with coil P

Is associated with coil S

Causes an induced current is coil S

All of these

None of these

10⁶electrons are moving through a wire per second, the current developed is

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1.6 x 10^-19

1 A

1.6 x 10^-15A

10⁶A

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

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9 x 10⁵V

9 V

8 x 10⁶V

80 V

Which of the following is not a unit of power:

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J-sec

Watt

N m/sec

Horsepower

The straight current carrying conductor experiences maximum force in a uniform magnetic field when it is placed

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parallel to the field

Perpendicular to the field

At an angle of 45 to the field

None of the above

The current through a metallic conductor is due to the motion of

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protons

neutrons

electrons

free electrons

Micheal Faraday and joseph Henry belong respectively to:

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USA and England

England and France

England and USA

USA and France

None of these

The rate of change of momentum of a molecule is equal to:

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Pressure

Work

Density

Force

Doping is the process in which the small amount of impurity is added into pure semiconductor lattice in the ratio

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1 to 10³

1 to 10⁴

1 to 10⁵

1 to 10⁶

The direction of torque can be determined by

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Head to tail rule

Right hand rule

Left hand rule

None of these

In case of destructive interference of two waves, the amplitude of the resultant wave will be ______ either of the waves

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Greater then

Smaller then

Equal to

None of these

M.K.S. unit of pressure

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Atmosphere

Dynes per sq.cm

Meter

Pascal

The substances which break just after the elastic limit is reached, are known as

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brittle substances

ductile substances

plastic substances

elastic substances

The moon produces the tides raise the water in the sea roughly

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Once a day

Twice a day

Several a day

None of these

For earth the escape velocity is 11.2 kms^-1. For a planet whose mass and radius are twice those of the earth, the escape velocity will be

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44.8 kms^-1

22.4 kms^-1

11.2 kms^-1

2.8 kms^-1

Two forces of 6 N and 8 N can produce a resultant of

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0 N

1 N

10 N

18 N

Fractional error in a measured quantity is determined by

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Measured value / Absolute error

Absolute error / Measured value

Measured value + Absolute error

Measured value - Absolute error

A man fires a bullet of mass 200 g at a speed of 5 m/s.The gun is of one kg mass.by what velocity the gun rebounds backwards?

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0.1 m/s

10 m/s

1 m/s

0.01 m/s

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