Question # 1

If a freely oscillating system is subjected to an external force, then

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free vibrations will take place

the body will move with its natural frequency

forced vibrations will take place

none of them

When a platinum wire is heated, it appears yellow at

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1600°C

900°C

1100°C

1300°C

The definite number of significant figures in 5000 is:

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Four

Three

Two

One

By CAT scans, we can detect the density difference of the order of:

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1%

20%

30%

50%

70%

Scalar product is also called:

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Cross product

Dot product

Product scalar

Product vector

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

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70%

100%

35%

38%

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

The temperature scale approved in SI units is:

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Celsius scale

Kelvin scale

Fehrenheit scale

None of these

Solar cell converts sunlight directly into

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potential energy

thermal energy

mechanical energy

electrical energy

In above figures, tell which set of graphs shows that a body is moving with uniform velocity:

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(i) and (ii)

(ii) and (iii)

(iii) and (iv)

The values 1 and 0 are designated as:

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Continuous values

Binary values

Boolean values

Decimal values

Either (B) and (C)

According to the special theory of relativity, time is

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absolute quantity

not absolute quantity

constant quantity

none of these

If the formula PV = nRT, n denotes:

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Number of molecules per unit volume

Number of moles

Number of molecules

None of these

Hold the solenoid in the right hand with fingers curling in the direction of current. The direction of the field will be given by:

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Thumb

Curled fingers

Middle finger

Arm of right hand

None of these

The basic circuit element in A.C. circuits are:

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Resistor and capacitor

Resistor and Inductor

Capacitor only

Both (B) and (C)

None of these

At low speeds, the drag force is

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proportional to speed

inversely proportional to speed

not simply proportional to speed

none of them

The displacement of body executing SHM is

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x_ocoswt

x_osinwt

x_osin²wt

Both A, B

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

A potential barrier of 0.7V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

If a given spring of spring constant k is cut into two indentical segments, the spring constant of each segment is:

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k/2

2 k

4 k

None of these

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

Electric flux is:

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Cross product of two vector

Dot product of two vectors

A vector quantity

A scalar quantity

Both (B) and (D)

If water rises 4 cm in a long, thin tube because of capillary action, then, under corresponding conditions of use, the rise (in the tube) of a liquid whose density is 2 g/cm²will be

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1 cm

2 cm

8 cm

None

The number of vibrating body at any instant from its equilibrium position is called

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displacement

frequency

amplitude

time period

In RLC series circuit, resonance occurs when

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X_{L > Xc}

X_{L < Xc}

X_{L = Xc}

None of these

When two objects are rubbed together, their internal energy

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remains same

decreases

remains the same then decreases

increases

The number of isotopes of hydrogen are

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2

1

3

4

If mass of 10 gm is suspended from a spring of K=0.8 Nm^-1then the extension will be:

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10 cm

1 m

10 mn

None of these

Split rings act as

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Vibrator

Resistor

Motor

Commulator

The time taken by light to travel from moon to earth is:

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80 sec

500 sec

1.802 X 10⁴sec

Aerophysics

One radian is equal to:

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30.3°

45.3°

50.3°

57.3°

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