Question # 1

De-Broglie received the Nobel prize in

Choose an answer

1929

1937

1928

1924

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

A longitudinal sinusoidal wave has wavelength of 1cm and a period of 2sec. Its wavevelocity is:

Choose an answer

50 cm/ sec

0.5 cm/ sec

5 m/ s

0.005 m/ sec

The product of resistance and conductance of a resistors is equal to:

Choose an answer

1

Conductivity

Resistivity

Zero

A point on the rim of wheel 400 cm in diameter has a velocity of 1600 cms-1 . The angular velocity of the wheel is:

Choose an answer

6 rad/s

4 rad/s

2 rad/s

8 rad/s

The minimum energy required to remove an electron is called:

Choose an answer

Stopping potential

Work function

Kinetic energy

None of these

The energy of photon of wavelength 1240 nm is:

Choose an answer

0.5 eV

1.0 eV

1.5 eV

2.0 eV

The work done to keep the satellite in the given orbit is.

Choose an answer

Zero

infinity

unit

can’t be decided

Two artificial satellites of unequal masses are revolving in a circular orbit around the earth with a constant speed. Their time periods:

Choose an answer

Will be different

Will depend on their masses

Will be same

Will depend upon the place of their projection

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

Real gases strictly obey gas laws at:

Choose an answer

High pressures and low temperatures

Low pressures and high temperatures

High pressures and & temperatures

None of these

Of electron of 50 keV strike a heavy target. Then radiation emitted by target will be

Choose an answer

Visible light

Radio waves

Ultraviolet

None of these

In closed end organ pipe, the frequency of first harmonic is 300 Hz. The frequency ofthird overtone is :

Choose an answer

900 Hz

1500 Hz

2100 Hz

600 Hz

A force of 6 N act horizontally on a stationary mass of 2kg for 4s. The kineticenergy in joule is

Choose an answer

12

72

56

888

Tick which of the following is not state variable:

Choose an answer

Heat energy

Pressure

Entropy

Volume

Rest mass energy of electron is:

Choose an answer

1.02 MeV

0.51 MeV

931 MeV

200 MeV

The magnitude of potential barrier for Ge is

Choose an answer

0.7 v

0.3 V

7v

3 v

The motion of molecules in gases i:

Choose an answer

Orderly

Random

Circular

All of these

The magnetic field produced due to the current in a straight wire is proportionalto the :

Choose an answer

Electric current

Conducting material

Length of the wire

Diameter of the wire

A pulsating DC can be converted into constant voltage by using

Choose an answer

Filter

Full wave rectifier

Half wave rectifie

Bridge rectifier

A gas which strictly obeys the gas laws under all conditions of temperatures and pressure is called:

Choose an answer

Ideal gas

Inert gas

Real gas

None of these

The maximum energy of the photoelectrons can be determined by making the:

Choose an answer

Anode positive

Anode negative

Cathode positive

Both (b) & (c)

A tritium and alpha particle enter the magnetic field with same kinetic energy, what will be the ratio of their radii?

Choose an answer

3:4

√3: 1

√3: 4

√3:√2

A photo cell receives light from a source at 50 cm away and produces 40mAcurrent inthe circuit. When the same source at is at distance 1 m from photo cell,current in the circuit will be

Choose an answer

20 mA

80mA

60 mA

10 mA

For a particle in circular motion the centripetal acceleration

Choose an answer

may be more or less than its tangential acceleration

equal to its tangential acceleration a

more than its tangential acceleration

less than its tangential acceleration

A sonometer wire 100 cm in length has a fundamental frequency of 330 Hz. Thevelocity of propagation of waves along the wire is

Choose an answer

115m/sec

660m/sec

990m/sec

A total charge of 100C flows through 12W bulb in a time of 50 second. Which is the potential difference across the bulb during this time?

Choose an answer

0.12V

6.0V

2.0V

24V

When the velocity of a body is doubled:

Choose an answer

Its K.E is doubled

Its P.E is doubled

Its momentum is doubled

Its acceleration is doubled

As the intensity of incident light increases:

Choose an answer

Photoelectric current increases

Photoelectric current decreases

Kinetic energy of emitted photoelectrons increases

Kinetic energy of emitted photoelectrons decreases

The most penetrating radiations out of the following is that of

Choose an answer

𝛾-rays

β-rays

α-particles

X-rays

Capacitor stores energy in the form of :

Choose an answer

Electric field

Both of these

Magnetic field

Gravitational field

When heat is added to the system, the entropy change is:

Choose an answer

Positive

Negative

Zero

None of these

The number of electrons in a nucleus X of atomic number Z and mass number A is:

Choose an answer

A

W

Z

Y

A couple produces

Choose an answer

linear motion

rotational motion

both (A) and (B)

None

A stone of mass 0.5kg tied with a string of length 1m is moving in a horizontal circle with a speed of 4ms-1 . The tension acting on the string in newton is:

Choose an answer

2

0.2

8

0.8

When ultraviolet rays are incident in metal plate, then photoelectric effect does not occur. It occurs by the incidence of:

Choose an answer

x-rays

Infrared rays

Radio wave

Greenhouse effect

The binding energy per nucleon is:

Choose an answer

Greater for heavy nuclei

Least for heavy nuclei

Greatest for light nuclei

Greatest for medium nuclei

The temperature at which all the gases become liquid is called:

Choose an answer

273 K

-273 K

Absolute Zero

Both (B) and (C)

A non-inverting amplifier has infinite input resistance then the voltage gain of noninverting amplifier will be:

Choose an answer

Zero

Infinite

One

100

A human eye can detect the electromagnetic radiations of the type:

Choose an answer

Infrared radiations

For- infrared radiations

X-rays radiations

Red radiations

A parallel plate air capacitor is charged and then isolated. When a dielectric material is inserted between the plates of the capacitor , then which of the following does not change:

Choose an answer

Electric field between the plates

Charge on the plates

Potential difference across the plate

Energy stored in the capacitor