Question # 1

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

Astrophysics is a branch of physics, which deals with:

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Sub-atomic particles

Stars and galaxies

Light and sound

Music

During the projectile motion, the horizontal component of velocity

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changes with time

remains constant

becomes zero

decreases with time

A stationary sound wave has frequency 165 Hz (speed of sound in air = 330 m/s) then distance between two consecutive nodes is

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2 m

1 m

0.5 m

4 m

A reversible cycle is the one in which

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some of the changes are reversible

all of the changes are reversible

all of the changes are irreversible

none of them

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

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2.9 s

3.0 s

6.6 s

9.6 s

If volume of wire is 'AL' and there are 'n' numbers of charge carriers per unit volume, then the total number of charge carriers are

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n/AL

Al/n

nAL

nA/L

During the positive half-cycle in the half-wave rectification,the diode

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does not conduct

conducts

either of these

neither of these

Fidelity refers to

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Reproduction of original sound

Reproduction of original image

Reproduction of music

Reproduction of a CD from original copy

In a heat engine, heat is supplied by the

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cold reservoir

sink

hot reservoir

none of them

The SI unit of flux density is

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Newton/Amp-meter

Newton-m/Ampere

Newton-m/Amp²

Newton-Amp/meter

The distance from Earth to Sun is

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10⁹ m

10⁸ m

10¹⁰ m

10¹¹ m

In rotational motion, the analogue of force is

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Rotational inertia

Moment of inertia

Torque

Mass

If we increase the distance between two plates of the capacitor the capacitance will

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Increase

Decrease

Remain same

First increase then decrease

The pressure will be low where the speed of the fluid is

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Zero

High

Low

Constant

An n-type semiconductor is obtained by doping germanium or silicon with

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Tetravalent impurity

Trivalent impurity

Pentavalent impurity

Monovalent inpurity

Acceleration is a physical quantity which is

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Scalar quantity

Vector quantity

Constant quantity

None of these

Biomass is a potential source of renewable energy. This includes all the organic material such as

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Crop residue

Natural vegetation

Animal dung

All of these

Semiconductor materials have the conductivities generally lies between

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10^-5 to 10^-6 (Ωm)^-1

10^-6 to 10^-4 (Ωm)^-1

10^-7 to 10^-3 (Ωm)^-1

None of these

The unit of intensity of electric field is

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newton/coluomb

Joule/culomb

Volt x metre

Newton/meter

An object is placed at a distance of 200 cm from a convex lens of focal length 10 cm the linear magnification is

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1/3

2/3

3/4

None

Moment of inertia of a sphere is

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1/3 mr²

3/4 mr²

4/5 mr²

2/5 mr²

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