Question # 1

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

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2 mo

1.67 mo

0.67 mo

2.67 mo

An inertial frame is that frame in which

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a>0

a=0

a<0

none of these

If the acceleration of a body is negative, then slope of the velocity-time graph will be:

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Zero

Positive

Negative

Infinity

One coulomb per second is equal to

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One volt

One ampere

One hom

One henry

Which of the following material has longer half life

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radium

polonium

radium

uranium

A body moving with an acceleration of 5 m/sec²started with velocity of 10 m/sec. What will be the distance traversed in 10 seconds?

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150 m

250 m

350 m

400 m

A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts

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1310 W

670 W

810 W

1210 W

Most practical applications of electricity involve

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Charges at rest

Charges in motion

Electrons at rest

Atoms in motion

Molecules in motion

G.P. Thomson observer experimentally that electrons and neutrons possess

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particle-like properties

wave-like properties

neither particle nor wave like properties

none of these

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

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low

zero

high

all of them

Flux through a closed surface of any shape and flux through the surface of a sphere drawn around a charge are:

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Different

Same

Such that it is greater in the first case

Such that it is greater in the second case

None of these

The pointer of a magnetic compass:

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Is affected only by permanent magnets

Align itself parallel to the applied magnetic field

Vibrates in the magnetic field of the current

Aligns itself perpendicular to the magnetic field

Both (C) and (D)

Angular frequency 'w' is basically a characteristics of

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linear motion

circular motion

both of them

none of them

The number of input terminals of an op-amp is:

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One

Two

Three

Four

None of these

In free space, the speed of electromagnetic waves is

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3 x 10⁸ms^-1

3 x 10⁶ms^-1

4 x 10⁷ms^-1

3 x 10⁹ms^-1

A process in which no heat enters or leaves the system is called

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isochoric process

isothermal process

adiabatic process

none of them

Referring to above figure, current in coil P falls from its maximum value to zero:

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

When switch is kept closed

None of these

Mass of proton is

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1.67 x 10^-27kg

1.67 x 10^-31kg

1.66 x 10^-34kg

1.67 x 10^-17kg

Peak value of alternative current is:

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one of its Instantaneous value

Equal to its RMS value

The same as its peak-to-peak value

Both (B) and (C)

None of these

Referring to above figure, current in the coil P grows from zero to its maximum value:

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

All of above

Neither of above

The application of Bernoulli's equation is

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Torricelli's theorem

Venture relation

Binomial theorem

Both a and b

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

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60 W bulb

100 W bulb

Both equally

None of these

F = I(L x B) is a

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vector

scalar

unit vector

none of these

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

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2R

4R

16R

Zero

SI unit of wave length is:

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Kilometer

Metre

Centimetre

Hertz

Which of the following does not obey ohm's law?

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Copper

Al

Diode

None

Fluid A is more viscous than fluid B. While flowing through a pipe of the same dimensions and material which fluid takes longer to travel at 25°C?

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fluid B

fluid A

both take the same time

not possible to determine from given information

The decrease in velocity per unit time is called

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deceleration

acceleration

uniform acceleration

variable acceleration

A tube is tapered from 20 cm diameter to 2 cm diameter, the velocity at the first cross-section is 50 cm/s, then the velocity at the second cross-section is

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50 m/s

20 m/s

40 cm/s

5 cm/s

Which of the following is not mechanical wave?

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Sound wave

Light wave

wave produced in spring

None of them

When half of the cycle of a body executing S.H.M is completed, then the phase of the vibration will be

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45°

90°

135°

180°

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