Question # 1

The time of flight of a projectile is maximum when angle of projection is:

Choose an answer

30 Degree

45Degree

60Degree

90Degree

A wave which consists of a single, non-repetitive disturbance is called a

Choose an answer

Continuous wave

Longitudinal wave

Pulse

Transverse wave

The fundamental frequency of a closed organ pope is 50 Hz. The frequency ofsecond over tone is

Choose an answer

100hz

150hz

60hz

250hz

A machine gun fires ‘n’ bullets per second and the mass of each bullet is m. If v is the speed of each bullet then the force exerted on the machine gun is:

Choose an answer

mng

mnv

mnvg

mnv/g

Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is:

Choose an answer

F/8

F/4

F/16

4F

The momentum of a particle is numerically equal to its K.E. What is the velocity of a particle?

Choose an answer

9 ms^-1

3 ms^-1

2 ms-1

1 ms^-1

The energy of photon of wavelength 620 nm is:

Choose an answer

0.5 eV

1.0 eV

1.5 eV

2.0 eV

A satellite moving round the earth constitute

Choose an answer

An inertial frame of reference

Non inertial frame

Neither inertial nor non inertial

Both inertial and non-inertial

For a normal AC cycle, during T/2 to T the diode act as:

Choose an answer

Open switch

full wave rectifier

Close switch

All are correct

When a particle moves in a circle the angle between it linear velocity and the angular velocity is always

Choose an answer

0°

180°

90°

none of them

If the K.E. of a body is increased by 300%, its momentum will increase by:

Choose an answer

100 %

150 %

√300%

175 %

In photo electric cell, the photo electric current

Choose an answer

Decreases with increase in frequency of light

Depends on intensity and frequency of light

Does not depend upon the frequency of light and but depends upon intensity of light

Increases with increase in frequency of light

Wavelength of the wave is the distance between the particles of the medium having adifference of:

Choose an answer

Zero

n

2n

𝜋2

When passes from medium to another, deviate from its path is called

Choose an answer

reflection

refraction

diffraction

transmission

If a source of emf is traversed from positive to negative the potential change will be:

Choose an answer

Positive

Negative

Zero

Constant

G.P Thomson revealed:

Choose an answer

Particle nature of electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

The radius of orbit of a geostationary satellite depends upon:

Choose an answer

Mass of satellite and its time period

Mass of satellite and mass of earth

Mass of earth, mass of satellite and time period of satellite

Mass of earth and time period of earth

Which of the following have maximum ionization power?

Choose an answer

𝛼 −rays

𝛽 −rays

𝛾 −rays

Same for all

Which combination of 7 identical resistors of 3-ohm will give 12/13 ohm:

Choose an answer

3 series, 4 parallel

5 series, 2 parallel

2 series, 5 parallel

4 series, 3 parallel

The rate at which the battery is supplying the electrical energy is the:

Choose an answer

Power output

Electrical power

Power input

Both A and C

Choose incorrect about properties of photon

Choose an answer

Rest mass of photon is zero

A photon is never at rest

Photon is not deflected by electric field not by magnetic field

The velocity of photon is different in different media

Capacitance of a capacitor does not depend upon

Choose an answer

Separation between plates

Thickness of the plates

Area of the plates

Medium between the plates

Intensity of light from a point source at the edge of unit sphere will be:

Choose an answer

𝑃

P(4π)

4𝜋

Two satellites are going around the earth at a height of 250 km and 450 km respectively. If angular speed for both is same, then centripetal acceleration will be.

Choose an answer

more for first

more for second

same for both

nothing can be decided

A photo cell is based on:

Choose an answer

Compton effect

Pair production

Photo cell

All of these

Interference and diffraction of light confirms its:

Choose an answer

Particle nature

Dual nature

Wave nature

Electromagnetic nature

The force which can do no work on the body on which it acts:

Choose an answer

Frictional force

Elastic force

Gravitational force

Centripetal force

Between the plates of a parallel plate condenser there is 1mm thick paper of dielectric constant 4. Itis charged at 100 volt. The electric field in volt/meter between the plates of the capacitor is:

Choose an answer

100

25000

100000

400000

The motion of molecules in gases i:

Choose an answer

Orderly

Random

Circular

All of these

The maximum energy of the photoelectrons depends upon:

Choose an answer

Frequency of incident light

Intensity of incident light

Nature of metal

Both (a) & (c)

select Which one of the following is not performing projectile motion

Choose an answer

A gas filled balloon

) Bullet fired from gun

A football kicked

A baseball shot

In a full wave rectifier, the diode conducts during

Choose an answer

Both halves of the input cycle

A portion of the positive half cycle of the input

Positive half cycle of the input

Both halves of the input cycle

If the tension in a string stretched between two fixed points is made four times, the frequency of the fundamental harmonic will become:

Choose an answer

Two times

Three times

Four times

Six times

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

Choose an answer

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

Thermal radiations are a type of:

Choose an answer

Mechanical waves

Electromagnetic waves

Alpha rays

Electrons

If the radius of the circular path of particle going around the circle is doubled without changing its frequency of rotation, then centripetal force on it is.

Choose an answer

doubled

halved

unchanged

quadrupled

Torque is necessary for producing.

Choose an answer

angular speed

linear acceleration

angular acceleration

none of these

Monochromatic light of wavelength 300 nm is incident normally on a surface of area 4 cm2.

If the intensity of light is 150 mW/m2; the rate at which photon strike the surface:

Choose an answer

2.53 × 1019

7.5 × 1019

9.1 × 1013

2.53 × 1013

The same retarding force is applied to stop a train. The train stops after 80 m. If the speed is doubled, then the Stopping distance will be:

Choose an answer

The same

Doubled

Halved

Four times

A monkey is accelerating down a string whose breaking strength is two third of his weight. The minimumacceleration of the monkey should be

Choose an answer

1/3g

g

2/3 g

0 m/s2

When a radioactive nucleus remits a beta particle, the proton neutron ratio:

Choose an answer

Decreases

Increases

Remain same

None of the above