Question # 1

If the period of oscillation of mass (M) suspended from a spring is 2s, then the period of mass 4M will be

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1 s

2 s

3 s

4 s

The peak voltage in a 200 volt A.C supply is nearly

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220

253

311

Which one of the following phenomena is not explained by Huygen's construction of wavefront?

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Refraction

Reflection

Diffraction

Origin of spectra

Two bodies with masses M_A and M_B are moving with equal kinetic energy.Their linear moments are numerically in a ratio | P_A| : |P_B| will be:

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M_B: M_A

M_A: M_B

√M_A : √M_B

M_A²: M_B²

What remains constant in the field of central force?

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Potential energy

Kinetic energy

Angular momentum

Linear momentum

Huygen's wave theory of light cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

In which case dose the potential energy decreases?

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On compressing a spring

On stretching s spring

One moving a body against gravitational force

One the rising of an air bubble in water

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

A cable breaks if stretched by more than 2 mm it is cut into two equal parts how much either part can be stretched without breaking?

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0.25 m

0.5 m

1 mm

2 mm

A p-n junction has a thickness of the order of

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1 cm

1 mm

10^-6 cm

10^-12 cm

Center of mass is a point

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Which is geometric center of a body

From which distance of particles are same

Where the whole mass of the body is supposed to be centered

Which is the origin of reference frame

A voltmeter has resistance of 2000 ohms and it can measure up to 2V. If we want to increase its range to 10V then required resistance in series will be

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2000 Ω

4000 Ω

6000 Ω

8000 Ω

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

A person standing on a rotating platform has his hands lowered He suddenly outstretches his arms.The angular momentum

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Becomes zero

Increases

Decreases

Remains the same

The direction of induced current is such that it opposes the very cause that has produced it This is the law of

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Lenz

Faraday

Kirchoff

Fleming

A 2 kg body and a 3 kg body have equal momentum. If the kinetic energy of 3 kg body is 10 J, the KE of 2 kg body will be

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6.66 J

15 J

22.5 J

45 J

Which of the following sources give discrete emission spectrum?

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Incandescent electric bulb

Sun

Mercury vapour lamp

Candle

Quantity that remains unchanged in a transformer is

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Voltage

Current

Frequency

None of these

Which quantity is increased in step-down transformer?

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Current

Voltage

Power

Frequency

If the period of oscillation of mass (M) suspended from a spring is 2s, then the period of mass 4M will be

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1 s

2 s

3 s

4 s

If the dot product of two non-zero vectors vanishes, the vectors will be

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In the same direction

Opposite to each other

Perpendicular to each other

Zero

The dimensional formula of torque is:

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[ML²T^-2]

{MLT^-2]

[ML^-1T^-2]

[ML^-2T^-2]

According to the Hooke's law the force required to change the length of a wire by 'I' is proportional to

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I^-2

I^-1

I

I²

Which of the following is the only vector quantity?

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Temperature

Energy

Power

Momentum

Choose the correct statement

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Both an ammeter and voltmeter should have small resistance

Both an ammeter and a voltmeter should have large resistance

An ammeter should have large resistance and a voltmeter should have small resistance

An ammeter should have small resistance and a voltmeter should have large resistance

The initial velocity of a body moving along a straight line in 7 m/s. It has a uniform acceleration of 4 m/s². The distance covered by the body in the 5th second of its motion is

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25 m

35 m

50 m

85 m

A motorist travels A to B at a speed at 40 km/h and returns at speed of 60 km/h. His average speed will be

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40 km/h

48 km/h

50 km/h

60 km/h

To increase the magnification of a telescope

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The objective lens should be of large focal length and eyepiece should be of short focal length

The objective and eyepiece both should be of large focal lengths

Both the objective and eyepiece should be of smaller lengths

The objective should be small focal length and eyepiece should be of large focal length

The half-life of a radio-isotope is 5 years. The fraction of atoms decayed in this substance after 15 years will be

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1

3/4

7/8

5/8

The smooth or steady stream-line flow is know as

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Laminar flow

Turbulent flow

Both a and b

None of the above

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