Question # 1

The waves which propagate out in space due to oscillation of electric and magnetic fields are known as

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e.m. waves

mechanical waves

sound waves

water waves

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

When either L or C is increased, the resonant frequency of the RLC series circuit

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Increases

Decreases

Remains the same

Becomes zero

Centripetal force for electron is given by

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mv²/ r

mv / r²

mv²/ r

mr²/ v

If the values of instantaneous and average velocities are equal, the body is said to be moving with

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uniform acceleration

uniform speed

variable velocity

uniform velocity

A resonance curve for RLC series circuit is a plot of frequency versus

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Voltage

Current

Impedance

Reactance

To and from motion of a body about its mean position is known as:

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Translatory motion

Vibratory motion

Rotatory motion

None of these

A mass difference of 0.0012 u is equivalent to and energy of:

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0.5 Me V

1.13 MeV

5.13 MeV

1.13 keV

1.13 eV

A ball is dropped from a height of 4.2 meters. To what height it will rise if there is no loss of KE after rebounding?

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4.2 m

8.4

12.6

None of these

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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larger

shorter

equal

none of these

The consumption of energy by a 60 W bulb in 2 minutes is:

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2 watt-hour

120 watt-hour

30 watt-hour

None of these

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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1.66 x 10^-29m

1.74 x 10^-10cm

17.4 x 10^-6m

1.74 x 10^-10m

In case of two identical charges placed certain distance apart, the electric field lines are:

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Straight lines

Sine curves

Curved

Both (A) and (B)

None of these

In solids, only following type/s of wave can travel:

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Transverse

Longitudinal

Both A and B

None of them

The first shell near the neucles is

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L-shell

X-shell

N-shell

M-shell

Which one of the following is correct?

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V_o= 1.414 V_rms

I_ams= 1.414 I_o

VO = 10.70 Vrms

Both a and b

The current that flows through the coil of a motor causes:

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Its shaft to revolve

Its brushes to rotate

Motor to move

Its shafts to rotate

None of these

An object undergoes SHM. Its maximum equilibrium positions:

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Maximum

Half of its maximum value

Zero

None

Electric potential of earth is taken to be zero because the earth is good

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Semiconductor

Conductor

Insulator

Dielectric

Smaller the damping, greater will be the

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frequency

wavelength

amplitude

none of them

When charged particle is projected perpendicular to a uniform magnetic field its trajectory is

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circular

elliptical

cycloid

straight line

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

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C

C/2

Zero

2C

The induced current in a conductor depends upon:

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both A and B

None of these

Biomass includes:

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Crop residue

Natural vegetation

Animal dung

All of these

Equal charges are given to two spheres of different radii. The potential will

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Be more on the smaller sphere

Be more on the bigger sphere

Be equal on both the sphere

Depend on the nature of the material of the sphere

SHM is type of ______ motion

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Vibratory

Linear

Circular

None

The displacement of body executing SHM is

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x_ocoswt

x_osinwt

x_osin²wt

Both A, B

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

An object in SHM will have maximum speed when its displacement from equilibrium position is:

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Infinity

Maximum

Zero

Minimum

A water hose with an internal diameter of 20 mm at the outlet discharges 30 kg of water in 60 s. What is water speed at the outlet if density of water is 1000 kg/m³during its steady flow

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1.3 m/s

1.6 m/s

1.9 m/s

2.2 m/s

When two protons are brought closer potential energy of both of them:

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Increases

Decreases

Remains same

None of these

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