Question # 1

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

A person standing near the track of a fast moving train has tendency to fall towards it because of

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Vibration due to motion of train

Gravitation force of attraction between person and trains

The high speed of train

Some other effect

The time period of a simple pendulum is 2 seconds if its length is increased by 4 times then its period becomes

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16 s

12 s

8 s

4 s

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

The velocity of falling raindrops attains limited value because of

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Up thrust of air

VIscous force exerted by air

Surface tension effect

Air currents atmosphere

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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

In LCR series AC circuit the phase angle between current and voltage is

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Any angle between 0 and ±π/2

π/2

π

Any angle between 0 and π/2

Ball pen function on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

When n-type of semiconductor is heated

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Number of electrons increases while that of holes decreases

Number of holes increases while that of electrons decreases

Number of electrons and holes remains same

Number of electrons and holes increases equally

The de broglie wave corresponding to a particle of mass m and velocity v has a wavelength associated with it

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h/mv

hm v

mh/v

m/hv

The average binding energy of a nucleus inside an atomic nucleus is about

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8 MeV

8 eV

8 Joules

8 ergs

The dot product of two vectors is negative when

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They are parallel vectors

They are anti-parallel vectors

They are perpendicular vectors

None of the above is correct

Huygen's wave theory of light cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

The unit of electric current 'ampere' is the amount of current flowing through each of two parallel wires 1 m apart and of infinite length will give rise to a force between them equal to

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1 N/m

2 x 10^-7N/m

1 x 10^-2N/m

4 x 10²N/m

The time period of a simple pendulum is 2 seconds. If its length is increased by 4 times, then its period becomes

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16 s

12 s

8 s

4 s

What is the average energy of N molecules of monoatomic gas?

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1/2 NKT

NKT

3/2 NKT

5/2 NKT

The nuclear model of atom was proposed by

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J.J Thomson

E. Rutherford

Neil Bohr

Summerfield

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

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

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

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

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Refraction

Reflection

Diffraction

Origin of sepectra

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