A proton is
a quantum of light energy
a quantum of matter
a positively charged atomic particle
another name for positron
Correct Answer :
C. a positively charged atomic particle
Related Questions
The shadow below a tree has bright spots in it because
light comes through circular gaps between the leaves
the leaves are circular
the rays bend to form circular spots
the gaps between the leaves act as pin holes
The unit of power in SI is
Joule
Newton
Joule/Sec
Erg/Sec
Air pressure is usually highest when the air is
warm and moist
cool and dry
warm and dry
cool and moist
When a body is immersed in a fluid the force of buoyancy of the fluid on the body depends on
the immersed volume of the body
density of the liquid
acceleration due to the gravity at the place
All the above
In the visible spectrum which colour has the shortest wavelength?
Red
Blue
Yellow
Violet
The base of an electric iron is brightly polished mainly
to make it smooth and frictionless
to make it rust - proof
to reduce heat loss by radiation
to make it more durable
The planet with the reddish tinge is
Jupiter
Mars
Mercury
Saturn
If an object is placed between two parallel plane mirrors, the number of images formed will be
1
infinite
0
4
Out of the following, name the fluorescent substance.
quinine sulphate solution
paraffin oil
fluorescein solutions
All the above
When a particle in motion is acted upon by a force in a direction perpendicular to the direction of motion, the path followed by the particle will be
a straight line
an ellipse
a circle
a parabola
Cosmic rays contain
protons and electrons
alpha particles
gamma rays
All the above
A photon is
a quantum of electromagnetic radiation
light source used in photography
a photo film
sun-light
If a man wants to hear clearly the echo of a sound produced by him from a hill, the hill should be away from him by a minimum distance of
330 m
33 m
16.5 m
165 m
How is it that Pluto is not always the farthest planet of the solar system?
Each planet becomes the farthest planet in its turn. Now it is the turn of Piuto
The Sun is now in the zodiac in which it is nearest to outer planets
The eccentricity of Piuto's orbit being substantial, this orbit cuts the orbit of Neptune
Piuto belongs to other solar system
Out of the following which is an insulator?
Silver
Copper
Nichrome
Dry wood
Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water
increases to a great extent
increases slightly
decreases slightly
decreases rapidly
Where does the centre of gravity of a rubber ring lie?
on the outer surface
in the inner surface
at the centre of the ring
None of the above
Frictional force acts in
the same direction as the motion
the opposite direction of the motion
all the directions
upward direction
Which of the following rays has the highest penetrative power?
a -rays
� -rays
? -rays
X-rays
The inability of a body to change its state of rest or uniform motion along a straight line is called its
momentum
velocity
acceleration
inertia
The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because
the ringing is not loud enough
the glass of the bell jar absorbs the sound waves
the bell jar is too small
there is no air or -any other gas in the bell jar
Which of the following pairs is not correct?
Television - Baird
Transistor ~ Shockley
Thermometer - Celsius
Barometer Torricelli
Heat is transmitted from one end of a metal rod to its other end by the method of
conduction
convection
radiation
sublimation
A piece of cork is embedded inside an ice block which floats in water. What will happen to the level of water when all ice melts?
It will go down
It will come up
It will remain at the same level
First it will go down and it will come up
The instrument used to measure atmospheric pressure is
Pyrometer
Eudiometer
Barometer
Hydrometer
The light from the star nearest to the sun reaches the earth in
8 minutes
4.3 years
12 seconds
24 hours
The mirage is a phenomenon
generally considered as a desert happening
caused by unequal heating of the several layers of the atmosphere above the desert
in which the refracted rays take a curved path resulting in total internal refection
All the above
To get 5 images of a single object one should have two plane mirrors inclined at an angle of
72°
60°
36°
90°
The world's first artificial satellite Sputnik I was launched by Russia in
1985
1957
1959
1960
Cyclotron is an apparatus used
as an accelerator for imparting energies to charged particles of atomic magnitudes
to reduce the charge on a particle
to produce intense magnetic field
to produce intense electrical field