Question # 1

A particle executing one dimensional motion, finally comes to rest, what will be the angle between

acceleration and displacement during motion:

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0

π

𝜋/2

𝜋/4

A man has weight 980 N in a stationary lift. What will be his weight if the lift starts moving up with anacceleration of 4.9 ms^-2

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980 N

1470 N

1980 N

1460 N

Which of the following have maximum ionization power?

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𝛼 −rays

𝛽 −rays

𝛾 −rays

Same for all

A light and a heavy body have equal momenta. Which one has greater K.E?

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The light body

The heavy body

The K.E are equa

Data is incomplete

The maximum wavelength of a transverse wave that can be set up in a string of length Lis

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L

2L

V

4L

Tick which of the following is not state variable:

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Heat energy

Pressure

Entropy

Volume

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

A ball takes ‘t’ second to fall from a height 𝒉𝟏 and ‘2t’ second to fall from a height 𝒉𝟐 then h1/h2 is:

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2

4

0.5

0.25

Change in momentum per second is:

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Product force and time

Product of pressure and area

Ratio of pressure and area

None of these

The equation W = ________𝜟U represents:

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Thermal process

adiabatic process

Isobaric process

None of these

A process which is carried at constant temperature and Boyle's law can be applied is called:

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Adiabatic process

Isothermal process

Isochoric process

None of these

The energy of photon of wavelength 620 nm is:

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0.5 eV

1.0 eV

1.5 eV

2.0 eV

When a gas is compressed:

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Its internal energy decreases

Its temperature decreases

Its temperature increases

None of these

An electric room radiator, which operates at 50V has resistance of 50 Ω. Power of the radiator is approximately:

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100W

50W

450W

1000W

In uniform circular motion, the factor that remains constant is:

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Linear velocity

Acceleration

Speed

All of these

de-Broglie wavelength associated with an electron moving at a speed of 1x106 ms-1 is

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4x10-10 ms-1

5x10-10 m

6x10-10 m

7x10-10 m

During a negative β-decay

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An atomic electron is ejected

A neutron in the nucleus decays emitting an electron

An electron which already present within the nucleus is ejected

A part of binding energy of nuclei is converted into electron

If the distance between the plates of a parallel plates capacitor is increased, its potential will:

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Remain the same

Increase

Decrease

Decrease exponentially

The emf of a cell of negligible internal resistance is 2V. It is connected to the series combination of 𝟐𝛀, 𝟑𝛀 𝐚𝐧𝐝 𝟓𝛀 resistance. The potential difference across 𝟑𝛀 resistance will be in volt:

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0.6

2/3

3

6

If the velocity of a body becomes half, the kinetic energy of body will become

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One fourth

Double

Four times

Half

A piece of Aluminium (Al) and a piece of Germanium (Ge) are cooled T1 K to T2 K. The resistance of:

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Each of them increases

Each of them decreases

Al increases and Ge decreases

Al decreases and that of Ge increases

A man pushes a wall and fails to displace it. He does:

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Negative work

Positive but not maximum work

No work at all

Maximum work

The resistance of operational amplifier between inverting and non-inverting terminal is of the order of:

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Few Ohms

Mega Ohms

Few Kilo Ohms

Micro Ohms

The minimum energy required to remove an electron is called:

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Stopping potential

Work function

Kinetic energy

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:

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2.53 × 1019

7.5 × 1019

9.1 × 1013

2.53 × 1013

The junction potential for Germanium is;

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3v

0.3 v

7v

0.7 v

The direction of force experienced by a moving in a magnetic field will be:

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Parallel to the field

Opposite to the field

Parallel to its direction of motion

Perpendicular to both the field and the velocity vector

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

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Anode positive

Anode negative

Cathode positive

Both (b) & (c)

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

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3 series, 4 parallel

5 series, 2 parallel

2 series, 5 parallel

4 series, 3 parallel

The efficiency of full wave rectifier is:

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25.6%

81.2%

81.6%

71.2%

The electron is a cathode-ray tube are accelerated from cathode to anode by a potential differenceof 2000 V. If this p.d is increased to 8000 V, the electrons will arrive at the anode with:

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Twice the kinetic energy and four times the velocity

Four times the kinetic energy and twice the velocity

Four times the kinetic energy and sixteen times the velocity

Sixteen times the kinetic energy and four times the velocity

A particular wavelength received from a galaxy is measured on earth and isfound to be 5% more than that its wave length on earth. Hence galaxy is

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Moving towards earth

Going away from earth

Stationary with respect to earth

None

When two semiconductors of p- and n-type are brought into contact, they from a p-n junction which act like a:

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Conductor

Amplifier

Oscillator

Rectifier

J.J Thomson finds:

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Particle nature of the electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

Avogadro number is known as number of molecules in:

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One kg of a substance

Unit volume of a substance

One mole of a substance

None of these

In 420 days, the activity of a sample of polonium (Po) fell to one-eight of its initial value. The half-life of polonium is :

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140days

45days

87days

90days

A person weighing 20 mg walks on a level platform with a speed of 2 ms-1 . The work by the person against the force of gravity is:

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Zero

2J

60J

600J

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:

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100

25000

100000

400000

De-Broglie received the Nobel prize on his work on:

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Wave nature of particle

Corpuscular nature of wave

Dual nature of particle

All of them

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

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100 %

150 %

√300%

175 %