Question # 1

The artillery shells travel along parabolic paths under the influence of

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magnetic field

electric field

electromagnetic field

gravitational field

A physical system under going forced vibrations is known as

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Simple harmonic oscillator

Compound harmonic oscillator

Physical harmonic oscillator

driven harmonic oscillator

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

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3525.0 volts

35.35 volts

353.5 volts

3.535 volts

In a cubic crystal, All solids meet at:

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60^o

90^o

109^o

30^o

10^o

The magnifier forms a virtual image of the object at:

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Least distance of distinct vision

Much farther than the least distance

Both A and B are correct

None of these

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

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

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

The conventional current is the name given to current due to flow of

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Positrons

Positive charges

Negative charges

Both A and C

None of these

The SI unit of magnetic flux is

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NmA^-2

NmA^-1

NAm^-1

Nm²A^-1

The Stephen-Boltzmann law for the black body radiation is given by

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E = T²

E = -T²

E = T⁴

E = -T⁴

The maximum kinetic energy of emitted photoelectrons depends upon:

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The intensity of incident light

Frequency of the incident light

Temperature of the surface

All of above

In the phenomenon of hysteresis, the magnetism and magnetizing current behaves as

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I lags

1 leads B

I & B becomes equal

None of these

During the projectile motion, the vertical component of velocity

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changes with time

becomes zero

becomes maximum

all of them

If g is the acceleration due to gravity on the surface of the earth, then the value of the acceleration due to gravity at height equal to R/2 from the surface of earth is (R is the radius of the earth)

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g/2

2/3 g

4/9 g

5/9 g

Wave front is the locus or all points in vibration are in the same

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Frequency

Phase

Wavelength

All of these

Fraunhofer spectrum is a

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Line absorption spectrum

Band absorption spectrum

Line emission spectrum

Band emission spectrum

As isolated system in which

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No internal force acts

No external force acts

No internal and external force acts

None of these

The frequency of an open pipe is f. if one end is closed then its fundamental frequencywill be:

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f/2

3f/4

f

2f

If the light travels in a straight line, the central region should appear

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Bright

Dark

No effect

None of these

Phenomenon of interference and diffraction support the:

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Quantum nature of light

Tranverse nature of light

Wave nature of light

Complex nature of light

The vector sum of three vectors gives a zero resultant. What can be the orientations

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90^o

60^o

120^o

180^o

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