Question # 1

A boat of mass 40 kg is at rest, A dog of mass 4 kg moves in the boat with a velocity of 10 m/s. What is the velocity of boat?

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4 m/s

2 m/s

8 m/s

1 m/s

When a constant potential difference is applied across the conductor, the drift velocity of electrons:

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Increases

Decreases

Remains the constant

Either of these

None of these

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

When a bicycle is in motion but not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts

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In the backward direction on the front wheel and in the forward direction on the rear wheel

In the forwards directions on the front wheel and in the backward direction on the rear wheel

In the forward direction on both the wheels

In the backward direction on both the wheels

The inside cavity of the black body is

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painted white

painted silver

blackened with soot

painted red

Gas constant per molecule is called:

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Universal gas constant

Stefen's constant

Boltzmann constant

Gravitation constant

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

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Helium

Neon

Both

None of these

The angle which specifies the instantaneous value of the alternating voltage or current is called

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phase

critical angle

angle of incidence

all of these

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

Electron is a particle whose mass is:

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Greater than that of a proton

Smaller than that of a proton

Smaller than that of a proton or a neutron

Greater than that of an atom

Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then

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R₁= 2R₂

R₂= 2R₁

R₂=4R₁

R₁= 4R₂

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

Such oscillations in which the amplitude decreases steadily with time, are called

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resonance

force oscillations

large oscillations

damped oscillations

If x-component of a vector is -3 N and y-component is 3 N, then angle of resultant vector will x-axis is:

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45°

315°

135°

225°

If a liquid is heated in weightlessness, the heat is transmitted through

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Conduction

Convection

Radiation

Neither, because the liquid cannot be heated in weightlessness

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

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one ohm

one joule

one volt

one ampere

The use of chips in electrons is described in the form of:

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Yellow boxes

Black boxes

Red boxes

White boxes

Orange boxes

The velocity of sound in air depends upon

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Density and elasticity of gas

Pressure

Wavelength

Amplitude and frequency of sound

The domains are of macroscopic size of the order of

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centimeters

meters

millimeters

nanomneters

Power is a :

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Vector quantity

Base quantity

Scalar quantity

None of these

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

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how heat is absorbed

how heat extracted

how this conversion takes place

none of them

Ohm's law states that

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The current through a resistor is directly proportional to the applied voltage

The voltage across a resistor is directly proportional to the current passing through it

Resistance is the constant of proportionality between the voltage and current

all of these

Electron volt is the unit of.

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Potential difference

Energy

Resistance

Capacitance

The sum of two or more vectors is equal to a single vector which is called:

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Component vector

Resultant vector

Product vector

None of these

When we consider the average velocity of a body, then the body is moving in

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straight line

curved path

may be in a straight or curved path

none of them

The ratio of the gravitational force F_gto the electrostatic force F_ebetween two electrons at the same distance apart is approximately

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9.8

24 x 10¹⁹

24 x 10⁴²

24 x 10^-44

In a heat engine, heat is supplied by the

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cold reservoir

sink

hot reservoir

none of them

A field in which the work done is moving a body along closed path is zero is called:

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Nuclear filed

Conservative field

Gravitational field

Non-conservative field

A dirty carpet is to be cleaned by heating. This is an accordance with____ law of motion:

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First

Second

Third

None of these

The electric field lines start from

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Positive charge

Negative charge

Either A or B

Neutron

An atom

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

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Smaller

Lerger

Same

Much larger

None of these

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