When the temperature increases, what happens to the surface tension of a liquid?
It decreases
It increases
It remains unchanged
Which of the following helps in determining the temperature of the Sun?
Stefan's law
Kirchhoff's law
Maxwell Boltzmann law
What is the resistance value of an ideal ammeter?
Zero
One
Infinity
When an iron ball is heated, which of the following attributes increases by the highest percentage?
Volume
Diameter
Area
Which of the following stars is the nearest to Earth?
Sun
Polestar
Comet
When was the first fusion bomb tested?
1945
1949
1962
The speed at which both microwaves and optical waves travel are the same in what?
A vacuum
Air
Water
Which of the following is not true for electromagnetic waves?
They travel at different speeds in air
They have momentum
They transport energy
Which of the following is not a property of ionic crystals?
Good conductors
High melting point
High latent heat of fusion
Which of the following can not be found at rest?
Photon
Electron
Proton
In 1921 the Nobel Prize in Physics was awarded for what?
The photoelectric effect
Modern quantum theory
Theory of radioactivity
The S.I. unit of speed is what?
Meter/second
Meter/hour
Meter/minute
In physics, a wormhole is a hypothetical topological feature of space-time. What is that in layman's terms?
A "shortcut" through space-time
An event horizon displacement
A dangerous way to travel
What exhibits viscosity?
Fluids
Solid and liquid
Only solids
Which of the following characteristics of matter causes molecular force?
Electric
Magnetic
Gravitational
Which of the following, at 100 degrees Celsius, causes the most severe burns?
Steam
Water
Oil
The S.I. unit of force is what?
Newton
Meter/second
Meter/second squared
Which of the following laws can be the basis of separating a mixture of gases?
Graham's law of diffusion
Boyle's law
Newton's law
What does a simple microscope show?
Upright virtual images
Inverted virtual images
Inverted real magnified images
What is the nature of the path of an electron which moves in a transverse electric field?
Parabola
Circle
Ellipse
What is an electron volt the unit of?
Energy
Charge
Electronic power
Which planet appears to be the brightest in the night sky?
Venus
Jupiter
Saturn
Which of the following is not an SI base unit?
Newton
Kilogram
Ampere
In obtaining x-ray photographs of a hand we use the principle of what?
Shadow photography
Photoelectric effect
Image formation by optical system
Domestic appliances like bulbs, fans and refrigerators are attached in which of the following manner?
Parallel
Series
Mixed
Which modulus of elasticity is involved in compressing a rod to decrease its length?
Young's modulus
Bulk modulus
Modulus of rigidity
Which of the following sources give discrete emission spectrum?
Mercury vapor lamp
Candle
Sun
What is the S.I. unit of work?
Joule
Watt
Newton
Which object has the lowest rotational energy?
Solid sphere
Ring uniform rod
Uniform rod
Which is the correct equation?
Wave speed = Frequency x wavelength
Wave speed = Frequency + wavelength
Wave speed = Frequency / wavelength
Which of the following does not change when a photon enters glass from air?
Energy
Momentum
Velocity
What is the function of the moderator in a nuclear reactor?
Slows down neutrons
Absorbs thermal energy
Absorbs neutrons
If an eagle and a sparrow are both traveling at 10 km/h, which has the greater momentum?
Eagle
Sparrow
The same
A magnifying glass which is used to produce a magnified image of an object has a:
Convex lens
Concave lens
Convex mirror
Which of the following cannot be used to separate isotopes?
Chemical reaction
Centrifuge
Thermal diffusion
What does Niels Bohr's theory concern?
Structure of an atom
Radioactivity
Thermodynamics
Which of the following is an isentropic process?
Adiabatic
Isothermal
Isobaric
The filament of an electric bulb is made of what?
Tungsten
Licorice
Iron
What is an A.C Dynamo used to convert?
Mechanical energy into electrical energy
Electrical energy into mechanical energy
A.C into D.C
What is the rate of change of displacement called?
Velocity
Speed
Acceleration
What is the binding energy of a hydrogen nucleus?
Zero
Infinite
Less then zero
A shunt is a wire of which of the following?
Very small resistance
High resistance
Very high resistance
What is a pure sine wave of sound called?
Tone
Chord
Melody
What does an electric cell convert?
Electric energy from chemical energy
Electrons
Electric charge
A choke coil is used in:
A.C. circuit
D.C circuit
Both A.C. and D.C. circuit
Which of the following is not a unit of energy?
Watt
Joule
Calorie
Who discovered infrared waves?
William Herschel
Johann Wilhelm Ritter
Wilhelm Conrad Rontgen
A ball is projected upward. As it rises which of the following increases?
Its potential energy
Its kinetic energy
Its momentum
Lubrication reduces friction because of what?
The relative motion between solid and liquid
The law of limiting friction is not applicable
Lubricant molecules act as ball bearings
According to classical theory, the proposed circular path of an electron in a Rutherford atom will be:
Spiral
Circular
Parabolic
For a floating body to be in stable equilibrium where should its centre of buoyancy be located?
Above the centre of gravity
Below the centre of gravity
It may be anywhere
When is the diffractive index of light greater?
When the wavelength is shorter
When the frequency is greater
When the wavelength is greater
The Moon has no atmosphere because of which of the following?
The escape velocity on it is small
It is not a planet
It is far away from the Earth
Which of the following does not have a subjective experience?
Intensity
Pitch
Timbre
Which of the following is not a thermodynamic function?
Work done
Enthalpy
Entropy
What is Lenz's law relate to?
The conservation of energy
The conservation of electric current
The conservation of electric charge
What does NEO stand for?
Near Earth Object
Natural Earth Orbit
No Early Observation
What remains constant when the Earth revolves around the Sun?
Angular momentum
Linear momentum
Angular kinetic energy
When a ray is refracted, which one of the following does not change?
Wavelength
Frequency
Amplitude
What are sound waves in the air always?
Longitudinal
Stationary
Transverse
What happens to light energy during interference?
It get redistributed
It is created at the maxima
It is destroyed at the minima
Longitudinal waves cannot travel through what?
A vacuum
Solids
Gases
Microwaves are electromagnetic waves with frequency in which range?
A giga hertz
A mega hertz
A micro hertz
The nature of the Sun's spectrum is:
A continuous spectrum with absorption lines
A line spectrum
A band spectrum
What are Gamma rays used for?
Sterilizing foodstuff
Tanning
Hair growth
What causes dampening in oscillatory friction?
Restoring force
Friction
Both restoring force and friction
What is the path of a projectile called?
Trajectory
Projectile path
Projected particle path
How does plugging help to retain sub soil water?
By breaking capillaries
By creating capillaries
By turning the soil upside down
Which material is used to see the infrared spectrum of light through a prism?
A single crystal of rock-salt
A flint crystal
A gold crown
A ball is projected upwards. Its acceleration at the highest point is which of the following?
Directed downwards
Directed upwards
Zero
What is the direction of flow of heat between two bodies determined by?
The difference in their temperature
Kinetic energy
Internal energy
What is the half life of lead?
Infinite
Zero
1590 days
The ratio of the velocity of an electron in the first orbit to the second orbit is what?
2
4
6
Which of the following waves are used for taking photographs during foggy or smokey conditions?
Infrared
Microwaves
Ultraviolet
A bullet strikes against a wooden block and is embedded in it. What is the nature of this collision?
Perfectly inelastic collision
Elastic collision
Inelastic collision
What is the essential characteristic for a good lubricant?
High viscosity
High density
High surface tension
What is heavenly matter landing on the Earth's surface known as?
Meteorite
Meteor
Shooting star
Which type of output continually changes value and can have any value in a given range?
Analogue
Digital
Optical
What force keeps the planets in orbit?
Gravity
Magnetism
Friction
What makes a cloud float in air?
Low density
High density
High viscosity
An ice cube is floating in a beaker of water. If the ice cube melts what happens to the level of water in the beaker?
It remains unchanged
It decreases
It increases
Which of the following statements about centripetal and centrifugal forces is correct?
Centripetal force is directly opposite to centrifugal force
Both are the same
Both forces act on the same body
The angle of minimum deviation of a ray of light through a glass prism is greatest for which color?
Violet
Orange
Yellow
The velocity of sound in a vacuum is what?
330m/sec
220m/sec
110m/sec
Which of the following causes a tidal wave in the sea due to the gravitational effect?
Moon
Earth
Sun
A parallel connection is essential in a car, why?
So everything can be turned off independently
To prevent a massive build-up of static
To stop the car exploding
The frequency of sound waves in the audible range is which of the following?
2O Hz-2000 Hz
O.5 Hz-5 Hz
1 Hz-10Hz
What is the mathematically defined surface around a black hole known as?
Event Horizon
Black Bits
Milky Way
If rails are on a plane surface and there is no friction, the power dissipated by an engine on the rails is which of the following?
Zero
Doubled
Halved
Who demonstrated that the observed motions of celestial objects can be explained without putting Earth in the center of the universe?
Nicolaus Copernicus
Alexander Arastu
Galileo Galilei
Which of the following is not essential for the free oscillations of a mass attached to a spring?
Gravity
Inertia
Elasticity
What are two of the most popular semiconductors which are frequently utilized in solid state electronic devices?
Germanium and silicon
Germanium and carbon
Silicon and carbon
Where is the image of a distant object formed by a short sighted eye?
In front of retina
In a blind spot
Behind the retina
What does hydrometry deal with the measurement of?
The amount of water vapor in the air
The density of water vapor in the air
The amount of water and air
What is the the unit of resistance?
Ohm
Joule
Tesla
When work is done on a body, kinetic or potential energy does what?
Increases
Decreases
Remain same
Where do cosmic rays originate?
Outside the solar system
From the Earth's core
From the Sun
How often does Halley's comet complete one revolution around the Sun?
76 years
46 years
20 years
What is the surface tension of boiling water?
Zero
Infinity
Less then zero
The speed of sound varies from substance to substance. In what does Sound travel the fastest?
Steel
Air
Vacuum
