Question # 1

A body whose momentum is constant must have constant

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Acceleration

Velocity

Force

None of these

When quarter of a circle is completed, phase of vibration is:

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90°

180°

45°

360°

Angular velocity is a:

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Scalar quantity

Vector quantity

Complex quantity

None of these

If a 40 watt light bulb burns for 2 hours. how much heat is generated

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288 x 10³J

288 x 10⁸J

288 x 10⁵J

288 x 10⁶J

If a gymnast is sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will:

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Increase

Decrease

Remains constant

None of these

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

none of them

The _____ viscous the medium is _____, is the value of terminal velocity of the droplet:

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More, lesser

Lesser, more

Both A and B

Lesser, lesser

In an A.C. circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45°. the value of inductive reactance will be

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R/4

R/2

R

Cannot be found with the given data

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 and induced current in coil S

All of these

None of these

In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:

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Greater than

Smaller than

Equal to

None of these

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 law of conservation is important in many sport like

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Diving

Gymnastics

Ice-skating

All of these

2π radian is equal to the degrees

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180^o

90^o

360^o

None of these

The repulsive force between the two electrons at a distance of 4 m is

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1.7 × 10^-15 N

2.4 × 10^-18 N

1.44 × 10^-29 N

1.9 × 10^-30 N

If an electron vertically downwards, then the horizontal component of the earth’s magnetic field will deflect it to wards

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West

East

North

A stethoscope detects the instant at which the external pressure is

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Greater than systolic pressure

Equal to systolic pressure

Lower than systolic pressure

None of these

The law of conservation of momentum says that the total angular momentum of the system remains constant if no external

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Force acts on it

Torque acts on it

Frictional force action it

None of these

the equation F = ma, the mass 'm' is

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rest mass

variable mass

inertial mass

gravitational mass

Glass and high carbon steel are the examples of

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brittle substances

ductile substances

plastic substances

elastic substances

Spokes used in a bicycle wheel increase its

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Moment arm

Moment of inertia

Acceleration

Velocity

The number 0.0023 should be expressed as

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0.023 × 10^-2

0.23 × 10^-4

2.3 × 10^-3

None of these

Young's modulus for tungsten is

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90

190

390

590

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