Question # 1

The interior of a hollow charged metal sphere is a region which:

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Contain some magnitude of electric field

Is full of electric field lines

Is field-free region

Either (A) or (B)

None of these

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

The decrease in velocity per unit time is called

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deceleration

acceleration

uniform acceleration

variable acceleration

Blood has a density

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Equal to water

Greater then water

Lesser then water

None of these

In radioactive decay, the new element which is formed due to the disintegration of original element is called

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element

daughter element

parent element

none of these

Which of the following can become a good permanent magnet

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iron

steel

both of them

none of them

For production of beats the two sources must have

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Different frequencies and same amplitude

Different frequencies

Different frequencies, same amplitude and same phase

Different frequencies and same phase

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be

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1840 KeV

1/1840 KeV

1 KeV

920 KeV

When two protons are brought closer potential energy of both of them:

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Increases

Decreases

Remains same

None of these

The force experienced by charged particle is maximum, if it moves

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parallel to magnetic field

perpendicular to magnetic field

opposite to the magnetic field

none of these

A wider objective and the use of blue light of short wavelength produces

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Interference

Diffraction

Less diffraction

Polarization

The saturation of the material reached when magnetic flux density changes from

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Zero to minimum value

Zero to maximum value

Maximum to zero value

Minimum to negative value

The kinetic energy of a body of mass 2 kg and momentum of 2 Ns is

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1 J

2 J

3 J

4 J

A rain drop of radius r falls from a certain height h above the ground. The work done by the gravitational force is proportional to

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r

r²

r³

r⁴

The displacement-time graph of a particle is as shown below.It indicates that

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The particle starts with a certain velocity,but the motion is retarded and finally the particle stops

The velocity of the particle is constant throughout

The acceleration of the particle is constant throughout

The particle starts with a velocity the motion is accelerated and finally the particle moves with a constant velocity

The bottom of a container filled with liquid appear slightly raised because of

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Refraction

Interference

Diffraction

Reflection

To wavelength of light by his experiment , Newton utilized:

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Wavelength of light

Intensity of light

amplitude wave

None of above

Two forces of 4 dyne and 3 dyne act upon a body.The resultant force on the body can only be

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Between 3 and 4 dyne

Between 1 and 7 dyne

More than 3 dyne

More than 4 dyne

The mother and daughter elements with the emission of 𝖰 − 𝒓𝒂𝒚𝒔, are called:

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Isotopes

Isobars

Isomers

Isodiapheres

Acceleration increases ______ when rain drop starts to fall

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Very fast

Gradually

Very slow

No increase

An average energy used by the car-from petrol in its life time

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1 × 10⁹ J

1 × 10¹⁰ J

1 × 10¹¹ J

1 × 10¹² J

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