Question # 1

Balmer identified the spectral lines in the spectrum of hydrogen in

Choose an answer

1785

1885

1936

1966

A device used to determine mass of an isotope quite accurately is known as.

Choose an answer

Spectrometer

Mass spectrometer

Mass detector

Electronic balance

Birds planes and boats are streamlined to reduce

Choose an answer

Turbulence

Thrust

Drag

Lift

Refraction contributes to the formation of.

Choose an answer

Rainbows only

Mirages only

Echo

Rainbows and mirages

White light a tungsten filament lamp is passed through sodium vapor and viewed through a diffraction gritting Which of the following best describes the spectrum which would be seen.

Choose an answer

Coloured lines on a black background

Coloured lines on a white background

Dark lines on a coloured background

Dark lines on a white background

Huygen's wave theory falls to explain

Choose an answer

Diffraction

polarization

Interference

Refraction

An electric Heater and a fan are marked 1000 W, 250 V and 100 W , 220 V respectively The resistance of fan is.

Choose an answer

Equal to that of heater

Greater than that of heater

Less than that of heater

Zero

The SI unit of viscosity is.

Choose an answer

Kg m -1 s-2

kg m-1 s-1

kg ms=-1

kg m s-2

A fixed pulley is emplyed to

Choose an answer

Do some work

Change the directionof force

Do more work with the same force but without using the pulling

Have mechanical advantage greater than 1

Which one of the following represents an ohm.

Choose an answer

Volt per ampere

Joule per second

Watt per ampere

Joule per coulomb

The building up of electric charge on the surface of objects is termed as.

Choose an answer

Static electricity

Electric charge

Electric current

Electrostatic induction

If a force of 10 N makes an angle of 30 ^o with x-axis its component is given by

Choose an answer

1.866 N

8.66 N

0.89 N

0.866 N

Generally, electrical resistivity of intrinsic semiconductors decreases with increasing.

Choose an answer

Pressure

Volume

Temperature

Density

When net torque acting on a system is zero which of the following will be constant.

Choose an answer

Force

Angular momentum

Linear momentum

Linear impulse

A single silicon photovoltaic cell produces a current of the order of.

Choose an answer

A few miliamperes

10² A

10³ A

10⁴ A

In a purely inductive circuit, the current

Choose an answer

Lags behind the emf by 90^o

Leads the emf by 90 ^o

Is in phase with emf

May lag or lead the emf

What is the smalless total resistance using only a 6 ohm and 12 ohm resistors.

Choose an answer

2 Ohm

3 Ohm

4 Ohm

6 Ohm

The most abundant isotope of neon is.

Choose an answer

Neon -20

Neon -21

Neon -22

Both a and c

If the temperature of the source and sink are increased by same amount the efficiency of the engine.

Choose an answer

Increases

Decreases

Remains unchanged

May increases of decrease

Stationary waves are produced when two identical waves are moving on the string.

Choose an answer

Along the same direction

Along the opposite direction

Along the perpendicular direction

Of length 1 m

A heater which is to be used on a 250 V mains circuit, has a 5 A fuse in its plug Which of the following is the most powerful heater that can be used with this fuse.

Choose an answer

150 W

500 W

1,000 W

2,000 W

If a di electric is placed between the plates of a capacitor, its capacitance.

Choose an answer

Decreases

Increases

Remains unaffected

Is zero

In compound microscope, image formed by the eyepiece is

Choose an answer

Real

Invented

Erect

Diminished

The basic quantity used to describe the state of magnetization of a substance is the

Choose an answer

Magnetic strength

Magnetic susceptibility

Magnetic moment

Magnetic moment per unit volume

Pitch of the sound determines

Choose an answer

Its shrillness

Loudness of sund

Intensity level

Quality of sound

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

Choose an answer

0.02 J

30 J

60 J

120 J

The Lenz's law is also a statement of the law of conservation of.

Choose an answer

Energy

Mass

Momentum

Torque

Which quantity has dimensions different from the others.

Choose an answer

Energy per unit volume

Force per unit area

Angular momentum per unit mass

Pressure

Which of the following is a thermodynamic potential

Choose an answer

Internal energy

Enthalpy

Gibb's free energy

All of these

During the alpha decay process

Choose an answer

A neutron is emitted

a electron is emitted

A helium core is emitted

A proton core is emitted

LASER is a device for

Choose an answer

Producing a beam of white light

Producing a beam of monochromatic and coherent light

Producing a beam of high intensity incoherent light.

Producing highly penetrating's X -rays

More Classes

Other Links

PPSC Physics Full Book MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer