Online Test

Question # 1

The maximum distance of body from mean position when body is executing SHM is called

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Time period

Displacement

Amplitude

Frequency

All types of food also contain a little radioactive substances, The most common are

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Potassium-40

Carbon-14

A and B

None of these

Einsteins theory gives us a physical picture of how gravity

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Created

Produced

Works

None of these

Neutron was discovered in 1932 by

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Bohr

Chadwick

Dirac

Fermi

The electromagnetic force acts on a microscopic level and is responsible for

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Friction

Cohesion

Adhesion

All of them

Electron gun consist of

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three anodes

heating cathode

three cathodes

three anodes, heating cathode, grid

Which quantity has the same units as impulse?

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force

work

linear momentum

acceleration

A body of mass 100 g is rotating in a circular path of radius r cm with constant velocity.The work done in one complete revolution is

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100 rJ

(r/100)J

(100/r)J

Zero

The ratio of kinetic energy to potential energy for solids is

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An electric field lines provides the information about

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Electric force

Direction

Medium

All of them

When a charged particle is projected perpendicular to uniform magnetic field, its trajectory (path) is

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A helix

Ellipse

Straight line

A circle

Dimensions of light year are

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[LT^-1]

[ML^-1T]

[ML^-1]

[M⁰L]

The curie temperature of iron is

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600 C^o

650 C^o

700 C^o

750 C^o

The working of carburetor of a car uses

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Gravitational law

Equation of continuity

Bernoulli's theorem

Stock's law

The displacement coincides with the path of the motion when a body moves in a

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curved line

straight line

either straight or curved

none of them

At what temperature does the mean kinetic energy of hydrogen atoms increase to such extent that they will escape out of the gravitational field of earth forever

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10075°K

18000°K

14075°K

22000°K

According to special theory of relativity, time is not a absolute quantity, depending upon the

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Inertial frame

Non-inertial frames

Motion of the frame of reference

None of these

With the help of interferometer, we can find the

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Wavelength

Frequency

Phase

None of these

The existence of positron was predicted by Dirac in

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1923

1927

1928

1929

The SI unit of stress is same as that of

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Momentum

Pressure

Force

Length

The velocity of light in vacuum can be changed by changing:

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Frequency

Amplitude

Wavelength

None of these

Application of photo electric effect is

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Photo diode

Photo transistor

Photo cell

None of these

The product of force and time of impact force is called

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Momentum

Impulsive force

Impulse

Rate of change of momentum

A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h.The force required to stop the vehicle in 10s force required to stop the vehicle in 10s is:

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120 x 10.8 N

180 N

720 N

360 N

The body oscillates due to a

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Applied force

Restoring force

Frictional force

None of these

The electrons occupying the conduction band are known as

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conduction electrons

free electrons

both of them

none of them

When we try to stop a very high photon it loses its identity and disintegrates into an electron and positron.This is called

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Pair Production

Annihilation

X-rays Production

Compton Effect

The principle of d.c. motor is based on

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Induced emf

Force due to magnetic field

Torque due to magnetic field

None of these

The speed of efflux is equal to the velocity gained by the falling fluid under the action of gravity through a certain height is known as

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Equation of continuity

Bernoulli s equation

Torrucelli s Theorem

Venturi s relation

Solids having partially field conduction bands are

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Insulator

Semiconductor

Super conductor

Semi conductor

A 2 kg body and a 3 kg body have equal momentum.If the kinetic energy of 3 kg body is 10 j,the KE of 2 kg body will be

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6.66 j

15 j

22.5 j

45 j

For the treatment of skin cancers, the isotopes/isotopes are used

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Phosphorous-32

Strontium-90

Both

None of these

The speed of a periodic wave can be found indirectly form its

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frequency

wavelength

frequency and wavelength

none of them

The valence of Rhydberg's constant is

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1.0974 × 10⁷ m^-1

1.0794 × 10⁷ m-1

1.0974 × 10⁹ m^-1

None of these

The units of modulus of elasticity are same as that of

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Stress

Strain

Force

None

The relation Cp > Cv by an amount equal to

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Gas constant

Universal gas constant

Both

None of these

When a γ-radiation issues out of nucleus than

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Charge changes

Mass changes

No change no mass

Charge and mass change

The dimensions of Einsteins Equation E = mc²

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[ML^-2]

[ML²T^-2]

[M²LT²]

[MLT^-1]

Plane microwaves are incident on a long slit having a width of 5 cm.The wavelength of the microwaves if the first minima is formed at 30° is

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25 cm

5 cm

2.5 cm

5 mm

Certain charge +q is placed at the center of a sphere. At each patch of the sphere, the directions of electric intensity and vector area are:

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Same

Different

Opposite to each other

At 60^owith each other

Both (B) and (C)

The engine of a car produces acceleration of 4 m/s²in the car.If this car pulls another car same mass,what will be the acceleration produces in m/s²

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2

8

4

12