Physics: MCQ Test (25 questions)

Question 1 of 25

Pascal is the unit of-

Aof humidity
Bof pressure
Cof rain
Dof temperature

Question 2 of 25

Which part of the Sun is visible during a solar eclipse?

Achromosphere
Bcrown or corona
Chalo
DNo parts

Question 3 of 25

Echo sounding is used in-

Ato produce vibrations in sound
Bto increase the frequency of sound
Cto measure the depth of the sea
Dnone of the above

Question 4 of 25

When two pieces of ice are pressed together, they stick together because-

AThe melting point of ice decreases due to increased pressure.
BDue to high pressure, the melting point of ice increases.
CDue to high pressure, the melting point of ice first decreases and then increases.
DThere is no relation between pressure and melting point.

Question 5 of 25

On which principle is the Total Radiation Pyrometer based?

AOn the Seebeck effect
BOn the Peltier effect
COn Stefan's law
DOn Joule's effect

Question 6 of 25

In which is the velocity of light maximum?

Adiamonds
BWater
Cvacuum
Dhydrogen

Question 7 of 25

Cobalt-60 is commonly used in radiation therapy because it emits-

Aalpha rays
BVita Rays
Cgamma rays
DX-rays

Question 8 of 25

100 W electric bulb is used for 10 hours a day. How many units of energy will be used in 30 days?

A1
B10
C30
D300

Question 9 of 25

The electromagnetic waves used for satellite communication are-

Ainfrared radiation
Bultraviolet radiation
Cradio waves
Dvisible light

Question 10 of 25

Bolometer is a device for measuring—

Aof pressure
Bgrowth in plants
Cof thermal radiation
Dof wind speed

Question 11 of 25

If you touch an iron block and a wooden block in the morning during cold days, the iron block feels colder because-

AThe temperature of an iron block is lower than that of a wooden block
BIron is a better conductor of heat than wood
CIron is a poor conductor of heat compared to wood.
DIron block is heavier than wood

Question 12 of 25

The formation of bright colours in thin soap foam is the result of which phenomenon?

AMultiple reflection and interference
BMultiple refraction and dispersion
CRefraction and Dispersion
DPolarization and interference

Question 13 of 25

The angle between the magnetic meridian and the geographical meridian is called-

Amagnetic inclination
Bmagnetic moment
Cmagnetic compass
Dnone of these

Question 14 of 25

How many colours does a rainbow show?

A7
B10
C12
D5

Question 15 of 25

The thermal conductivity of silver is higher than that of copper.

Aare less
Bis more
Cis equal to
Dnone of these

Question 16 of 25

When a ship moving in a river reaches the sea, the level of the ship-

Aas much as before
Bwill come up a little
Cwill come down a little
Dwill move up or down depending on the load it carries

Question 17 of 25

The stars appear higher in the sky than they actually are. What can explain this?

Aatmospheric refraction
BDispersion of light
Ctotal internal reflection
DDiffraction of light

Question 18 of 25

The device used to record and reproduce recorded dictation is called-

AAudiophone
BDictaphone
Cgramophone
Dmicrophone

Question 19 of 25

Mosquitoes are reduced when kerosene is added to stagnant water because it-

Ainterferes with reproduction
BHighly toxic to mosquitoes
Cobstructs the breathing of larvae
Drepels mosquitoes

Question 20 of 25

Radar is used in-

Adetecting objects using light waves
BDetecting objects by reflecting sound waves
CTo locate objects using radio waves
Dchasing rain clouds

Question 21 of 25

The unit of electrical quantity is-

AAmpere
BOm
CVolt
DCoulomb

Question 22 of 25

The working principle of a washing machine is—

Asubstation
Bdialysis
CCentrifugation
Ddiffusion

Question 23 of 25

Mirage is an illustration of which of the following?

Aonly the dispersion of light
Brefraction of light only
Conly total internal reflection of light
DBoth refraction and total internal reflection of light

Question 24 of 25

The wave theory of light was established by whom?

ANewton
BHuygens
CPlank
DFaraday

Question 25 of 25

Match List-I with List-II and select the correct answer using the code given below the lists. List-I List-II A High velocity 1. Mach B Wavelength 2. Angstrom C Pressure 3. Pascal D Energy 4. Joule

AABCD 2 1 3 4
BABCD 1 2 4 3
CB C D 1 2 3 4
DB C D 2 1 4 3