Question # 1

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

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1890

1895

1900

1905

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

According to the special theory of relativity, a moving clock

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runs faster

runs slower

neither runs faster nor slower

all of these

If the instantaneous velocity of a body does not change. the body is said to be moving with

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average velocity

uniform velocity

instantaneous velocity

variable velocity

If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:

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5 cm

10 cm

20 cm

25 cm

X-rays produced in a tube operating at 10⁵V. The speed of X-rays produced is

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3 x 10⁸m/s

3.1 x 10⁸m/s

2.8 x 10⁸m/s

1.88 x 10⁸m/s

In a three phase a.c. generator, there are

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2 coils

3 coils

1 coild

No coil

Aerodynamics is a branch of

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Hydrodynamics

Thermodynamics

Both of them

Statics

The application of Bernoulli's equation is

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Torricelli's theorem

Venture relation

Binomial theorem

Both a and b

Op-amp has been discussed as comparator of:

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Distances

Voltages

Velocities

Magnetic fields

Both (A) and (C)

The velocity of sound in air not effected by changes in

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Moisture contents in air

Temperature of air

The atmosphere pressure

The composition of air

According to kinetic theory of gases, molecules of a gas behave like

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Inelastic spheres

Perfectly elastic rigid sphere

Perfectly elastic non-rigid spheres

Inelastic non-rigid spheres

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

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0.4 A

11.4 A

9.8 A

10.6 A

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

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1 : 2

2 : 3

3 : 4

8 : 9

Work done along a closed path in a gravitational field is:

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Maximum

Minimum

Zero

Unity

The definite number of significant figures in 5000 is:

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Four

Three

Two

One

The power of an electric generating station is expressed in:

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Kilo Jule

Kilowatt-hour

Kilo watt

Watt

The wave form of S.H.M will be

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square wave

sine wave

rectified wave

saw-tooth wave

A metal road of length 1m is moving at a speed of 1 ms^-1In a direction making angle of 30º with 0.5 Y magnetic field. The emf produced in the rod is:

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0.25 N

0.25 V

2.5 V

2.5 N

25 V

The portion of the water above its mean level forms a:

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Crest

Trough

Both A and B

None of these

The velocity of light in vacuum can be changed by changing

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Frequency

Amplitude

Wavelength

None of these

If the time period a simple pendulum is 2 s, its frequency would be

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2 Hz

1.5 Hz

1.0 Hz

0.5 Hz

The torque per unit twist of coil is called

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proportionality constant

gravitational constant

boltzman constant

coupling constant

Resolving power in mth order diffraction for grating is given by:

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R = N/m

R = m/N

R = N x m

None of these

Referring to above figure, due to change in current in the coil P, the change in magnetic flux:

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Is associated with coil P

Is associated with coil S

Causes an induced current is coil S

All of these

None of these

The bands below the valence band are

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completely filled and play active part in conduction process

completely filled and plays no part in conduction process

completely filled and play active part in conduction process

not completely filled and play no part in conduction process

What will be the ratio of the distance moved by a freely falling body from rest in 4th and 5th seconds of journey?

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4 : 5

7 : 9

16 : 25

1 : 1

The current produced by moving a loop of wire across a magnetic field is called:

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Direct current

Magnetic current

Alternating current

Induced current

None of these

Density is defined as:

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Mass per volume

Volume per mass

Mass X volume

Mass per length

What is the current is a 2 x 10⁶ohm resistor having a potential difference of 2 x 10³volts?

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10^-1A

10^-2A

10^-4A

1 mA

For inducting emf in a coil the basic requirement is that:

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Flux should link the coil

Change in flux should link the coil

Coil should form a closed loop

Both B and C are true

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