Question # 1

Velocity is a

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scalar quantity

vector quantity

constant quantity

none of them

Blood has a density

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Equal to water

Greater then water

Lesser then water

None of these

In an adiabatic process the work is done at the expense of the

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energy supplied to the system

energy gained from the surroundings

internal energy

none of them

The magnitude of induced emf depends upon the:

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

The internal energy of an ideal gas system is generally the

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translational K.E of molecules

vibrational K.E of molecules

rotational K.E of molecules

all of them

In the expression F x t, the force F is

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total force

instantaneous force

average force

all of them

In equation F=ma, then mass 'm' is

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rest mass

variable mass

inertial mass

gravitational mass

In the production of beats by 2 waves of same amplitude and nearly same frequency, the maximum intensity to each of the constituent waves is

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Same

2 times

4 times

8 times

When a body is moving with uniform positive acceleration, the velocity- time graph is a straight line. Its slope is

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zero

negative

positive

non-existing

Above a certain velocity of a fluid is called

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turbulent flow

steady flow

either of them

both of them

A car battery has e.m.f 12 volt and internal resistance 5 x 10^-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

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5 volt

3 volt

15 volt

9 volt

One joule is equal to

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1.6 x 10¹⁹eV

6.25 x 10¹⁸eV

1.6 x 18¹⁸eV

6.25 x 10¹⁹eV

Which of the following is a characteristic of an ideal fluid?

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it is non-viscous

it is incompressible

it's motion is steady

all of the above

The unit of magnetic flux is

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Weber-m²

Weber-m³

Henry

Weber

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

Of the following, the option ______ reminds of longitudinal waves.

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Sound waves

Heat waves

Electromagnetic waves

Light waves

If speed of electron is 5 x 10⁵m/s. How long does it take one electron to transverse 1 m?

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1 x 10⁶

2 x 10⁶

2 x 10⁵

1 x 10⁵

Acceleration in a body is always produced in the directin of:

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Velocity

Weight

Force

Botha B and C

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10^-19C. The number of excess electrons on the drop is

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3.9

4

4.2

6

A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

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2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards?

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0.1 m/s

10 m/s

1 m/s

0.01 m/s

Where the streamlines are very far apart from each other, the pressure will be

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low

zero

high

all of them

Neutrons are

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positive charge

negatively charged

massless

neutral

The band above the valence band is called

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high energy band

conduction band

empty band

none of them

The value of current gain of n-p-n transistor is of the order of

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tens

hundreds

thousands

ten thousands

In a soft iron, domains are

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easily oriented along external field and do not return to original random positions

easily oriented along external field and readily returns to originally random position

do no oriented along external field and also do not returns to originally random position

none of them

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

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1.66 m

1.0 m

0.66 m

2.66 m

A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h. The force required to stop the vehicle in 10s is

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120 x 10.8 N

180 N

720 N

360 N

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