Question # 1

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

How much time, theα-particle more massive than an electron

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600

7000

5000

15000

Within each domain, the magnetic field of all the spinning electrons are

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parallel

antiparallel

perpendicular

all of them

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

In the case of an incompressible fluid in stead flow the net rate of flow of mass entering one end of the tube of flow is equal to the net rate of flow of mass leaving the other end. This equation is called

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Quadratic equation

Equation of discontinuity

Equation of continuity

None of the above

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 loudness and pitch of a sound note depends on

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Intensity and velocity

Frequency and velocity

Intensity and frequency

Frequency and number of harmonic

Resistance is measured in

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volts

ampere

ohm

watt

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 heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?

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200 W

302.5

250 W

350 W

1 amu is equal to

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-34kg

1.66 x 10^-27kg

The magnitude of the force producing an acceleration of 10 m/sec²in a body of mass 500 grams is:

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3 N

4 N

5 N

6 N

Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if

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They have the same potential

They have the same amount of charge

They have the same capacity

They have the same shape

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

The amount of coal used since 1945 up till now as compared to that used in the whole of history before that is

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Much more

Very small

No amount at all

None of these

The rate change of area expressed is expressed in:

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m²s^-1

ms^-2

m²s^-2

ms^-1

None of these

CT scanning is the abbreviated name of

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Computed Technology

Computed Technique

Computed Technology

Computerized Technique

If m is the mass of the gases ejected per second with velocity v relative to the rocket of mass M, then the acceleration of rocket is

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a = M/mv

a = mM/v

a = mv/M

a = v/mm

If the number of turns of a solenoid (carrying a steady current I) is doubled without changing the length of a solenoid, then magnetic field:

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Becomes Half

Becomes double

Is not affected

Becomes one fourth

None of these

SI unit of current describes the flow of charge at the rate of

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One ampere per second

One coulomb per second

One electron per second

6.25 x 10¹⁸electrons per second

Both B and D

When the pn-junction is in reversed biased, current flows through the junction due to the

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majority carriers

minority carriers

either of them

none of them

The special theory of relatively treats the problems involving:

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Inertial frames of reference

Non-inertial frames

Non-accelerated frame

Botha (A) and (C)

Both (B) and (C)

The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be

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500 m

500 nm

500 km

500 cm

None of these

The ratio of shearing stress/shearing strain is called as

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Modulus

Pascal modulus

Hooker's modulus

Shear modulus

Where the streamlines are very close to each other, the pressure will be

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low

zero

high

all of them

In describing function of digital systems, 1 represents:

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Closed switch

True Statement

Lighted bulb

Only (B) and (C)

All are true

The motion of a body in a straight line is the motion in

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one dimension

two dimension

three dimension

four dimension

Charge to mass ratio (e/m) of an electron is given by the relation

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e/m = 2V/Br²

e/m = 2V/B²r

e/m = 2V/B²r²

e/m = V/2B²r²

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

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0.52 A

1 mA

0.7 mA

1.4 A

Balmer series was identified in:

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1685

1785

1885

1985

1585

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