Question # 1

A body is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

A convex lens acts as diverging lens when the object is placed:

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Between F and 2F

At 2F

With focal length

Beyond 2F

The electric flux from a closed surface

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Is independent of the shape of the surface

Depends on the charge enclosed by the surface

Both a and b

None of the above

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

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Negative

Positive

Infinite

Zero

The rate of decay of radioactive substance

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is constant

decrease exponentially with time

varies inversely as time

decreases linearly with time

In case of planets, the necessary acceleration is provided by:

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Gravitational force

Coulomb force

Frictional force

None of these

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

Under the elastic region, the deformation produced in the material, the deformation produced in the material will be

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permanent

temporary

either of them

none of them

According to Huygen's principle

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light travels in straight line

Light is a transvers wave

Light has dual nature

All points on the primary wave-front are the sources of secondary wavelets

If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy

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0 J

2 J

5 J

10 J

The cause of mirage observed in desert is

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Refraction

Reflection

Scattering

Total internal reflection

As the droplet accelerates, the upward drag force on it

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Increases

Decreases

Suspended

None of these

The original source of geothermal energy is

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Biomass

Fossil fuels

Moon

Earth

The property of light which does not change with the nature of the medium is

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Frequency

Amplitude

Wavelength

None of these

At points where the crest (or trough) of one wave coincides with the crest (or trough) of the other wave, the wave produces

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destructive interference

constructive interference

diffraction

dispersion

For the angle of projection of a projectile for which its maximum height and horizontal range are equal

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50^o

45^o

60^o

76^o

A particle of mass m has momentum x.Its kinetic energy will be

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mx

mx²

x²/m

x²/2m

What is the main cause of the shinning of diamond?

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Reflection

Refraction

Total internal reflection

Dispersion of light

Wavelength of X-rays falling at a glancing angle of 30° on a crystal with atomic spacing 2 x 10^-10m for first order diffraction is

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4 x 10^-10m

2 x 10^-10m

0.2 x 10^-10m

20 x 10^-10m

The product of force and time is called

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Momentum

Force

Impulse

None of these

The dimensions of expression V_f = V_i + at. Taking the R.H.S

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[LT]

[LT²]

[LT^-1]

[LT^-2]

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