Question # 1

If the length of second pendulum becomes four times then its time period will become

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Four time

Two times

Six times

Eight times

Magnetic effect of current is used:

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In electric motor

To detect current

To measure current

All of these

None of these

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

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 _____ 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

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

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Fringe width will decrease

Fringe width will increase

Fringe width will remain unchanged

Fringe will become less intense

A rheostat can e used:

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As variable resistor

As potential divider

For varying the current

All of these

None of these

A swing has

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one natural frequency

two natural frequencies

three natural frequencies

four natural frequencies

Electric field lines emerge from the charge in:

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One dimension

Two dimensions

Three dimensions

Four dimensions

None of them

A choke coil is used as a resistance in

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d.c. circuit

a.c. circuit

d.c. potentiometer circuit

wheatstone bridge

A prism splits a beam of white light into seven component colors. This is so because

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Phase of different colors is different

Amplitude of different colors is different

Wavelength of different colors is different

Velocity of different colors is different

The error of any measurement may occur due to

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Negligence

Faulty apparatus

Inappropriate method

All of these

Which of the following is a non-conservative force

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Nuclear force

Elastic force

Electrostatic force

Viscous force

The study of nature has been classified into branches are:

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Two

Three

Four

None of these

If band gap between valence and conduction band material is 5 eV. The material is

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Insulator

Good conductor

Semiconductor

Such material are not exist

For maximum linear distance of travel, a projectile must be fired at an angle of

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0°

45°

90°

60°

The image formed after objective lens of an astronomical telescope is

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Inverted

Diminished

Real

All of these

On a diffraction grating which thing acts as a slit

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the lines which are ruled on it

the spacing between the lines

either of them

none of them

The K.E.of a light and a heavy object is same.Which object has maximum momentum?

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Light object

Heavy object

Both have the same momentum

Data is not sufficient

An object thrown in arbitrary direction in space with an initial velocity and moving freely under gravity will follow

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a circular path

a straight line

a hyperbola

a parabola

In an interference pattern of Ypung's double Slit (YDS) experiment:

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Bright fringes are wider than dark fringes

Dark fringes are wider than bright fringes

Both dark and bright fringes are of equal width

Central fringes are wider than the outer fringes

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15 m is

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9 x 10⁵ V

9 V

8 x 10⁶ V

80 V

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