Que- The unit for measuring electric power is the
a. Steridian
b. Watts
c. Watts
d. Volts
Answer- Watts
Que- The device used to change the speed of an electric fan is
a. Amplifier
b. Regulator
c. Switch
d. Rectifier
Answer- Regulator
Que- The material used in electric heater is
a. Tungsten
b. Nichrome
c. Brass
d. Steel
Answer- Nichrome
Que- After long periods of use, a grey spot develops on the inside of a bulb. This is because
a. The tungsten filament evaporates and collects there
b. The heat of the bulb scorches the glass at the top
c. Dust inside the bulb condenses on the top
d. Glass undergoes a change due to the heat
Answer- Dust inside the bulb condenses on the top
Que- What is the wavelength of visible spectrum ?
a. 1300 A°–3000 A°
b. 3900 A° – 7600 A°
c. 7800 A° – 8000 A°
d. 8500 A° – 9800 A°
Answer- 3900 A° – 7600 A°
Que- Which layer of the earth's atmosphere reflect back the radio waves to the earth's surface ?
a. Ionosphere
b. Stratosphere
c. Mesosphere
d. Exosphere
Answer- Ionosphere
Que- Where are mesons found ?
a. Cosmic rays
b. X-rays
c. Gamma rays
d. Laser beam
Answer- Cosmic rays
Que- Who discovered X-ray?
a. Marie Curie
b. Pierre Curie
c. Wilhelm Roentgen
d. Ernest Rutherford
Answer- Wilhelm Roentgen
Que- Which of the following has the lowest frequency?
a. Visible light
b. Gamma rays
c. Xrays
d. Ultra violet rays
Answer- Visible light
Que- Which of the following represents a relation for ''heat lost = heat gained'?
a. Principle of thermal equilibrium
b. Principle of colors
c. Principle of calorimetry
d. Principle of vaporization
Answer- Principle of calorimetry
Que- Q = mcdT refers to
a. Enthalpy formula
b. Heat Transfer formula
c. Specific Heat formula
d. Heat of Vaporization
Answer- Specific Heat formula
Que- Steam at 100°C causes more severe burns than water at 100°C because
a. Steam has no specific heat capacity
b. Steam has latent heat of vaporisation
c. Water has no specific heat capacity
d. Water has latent heat of fusion
Answer- Steam has latent heat of vaporisation
Que- No current will flow between two charged bodies if they have the same
a. Resistance
b. Charge
c. Potential
d. Charge/ potential ratio
Answer- Potential
Que- Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes
a. 2R
b. R/2
c. 5R/4
d. 3R/4
Answer- 5R/4
Que- Which of these liquids has the highest viscosity?
a. Milk
b. Syrup
c. Pineapple juice
d. Water
Answer- Syrup
Que- The absorption of ink by blotting paper involves
a. Viscosity of ink
b. Diffusion of ink through the blotting
c. Capillary action phenomenon
d. Siphon action
Answer- Capillary action phenomenon
Que- Water from soil enters into the root hairs owing to :
a. Atmospheric pressure
b. Capillary pressure
c. Root pressure
d. Osmotic pressure
Answer- Capillary pressure
Que- Which of the following liquids has the least density ?
a. Fresh water
b. Salt water
c. Petrol
d. Mercury
Answer- Petrol
Que- A small drop of oil spreads over water because :
a. Oil has a higher surface tension
b. Water has a higher surface tension
c. Oil has a higher viscosity
d. Water has a higher viscosity
Answer- Water has a higher surface tension
Que- An object at rest may have
a. Momentum
b. Potential energy
c. Velocity
d. Kinetic energy
Answer- Potential energy
Que- Which conservation principle is applicable in the case of the motion of a rocket?
a. Conservation of mass
b. Conservation of charge
c. Conservation of momentum
d. Conservation of energy
Answer- Conservation of momentum
Que- Rocket works on the principle of
a. Newton's Third Law
b. Newton's First Law
c. Newton's Second Law
d. Archimedes Principle
Answer- Newton's Third Law
Que- A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens due to
a. Outward pull on him
b. Inertia of motion
c. Change in momentum
d. Change in acceleration
Answer- Inertia of motion
Que- When a running car stops suddenly, the passengers tends to lean forward because of:
a. Centrifugal force
b. Inertia of rest
c. Inertia of motion
d. Gravitational force
Answer- Inertia of motion
Que- The surface tension of water on adding detergent to it
a. Increases
b. Decreases
c. No change
d. Becomes zero
Answer- Decreases
Que- A bottle of sodalime is grasped by the neck and swung briskly in a vertical circle, Near which portion of the bottle do the bubbles collect?
a. Near the bottom
b. In the middle of the bottom
c. Near the neck
d. Bubbles remain distributed uniformly
Answer- Near the neck
Que- Which liquid is the most viscous?
a. Water
b. Diesel
c. Milk
d. Oil
Answer- Oil
Que- Rain drops acquire spherical shape due to
a. Viscosity
b. Surface tension
c. Friction
d. Elasticity
Answer- Surface tension
Que- The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by
a. Bernoulli's principle
b. Magnetic properties of the ship's material
c. Newton's third law of motion
d. Earth's gravitational force
Answer- Bernoulli's principle
Que- Why do birds not have respiratory trouble at the time of flying at high altitude ?
a. Their lungs are very large
b. They fly inactively
c. They have extra air sacs
d. They use less oxygen
Answer- They have extra air sacs
Que- When a barometer reading suddenly recedes, it indicates that climate–
a. Will be very warm
b. Will be extremely stormy
c. Will remain cold
d. Incessant rain for at least 48
Answer- Will be extremely stormy
Que- When a barometer is rising air pressure is
a. Increasing
b. Decreasing
c. Constant
d. Zero
Answer- Increasing
Que- The pressure exerted by a 760 mm column of mercury at 0°C is known as
a. 1 pascal
b. 1 atmosphere
c. 1 bar
d. 1 poise
Answer- 1 pascal
Que- If a barometric reading is falling, this usually indicates what
a. Increasing pressure
b. Decreasing pressure
c. No pressure
d. None
Answer- Decreasing pressure
Que- In a Laser (say neon laser) all the atoms emit the light waves of
a. Same frequency
b. Same amplitude
c. Same phase
d. All of the above
Answer- All of the above
Que- The Laser is a beam of radiations which are
a. Non-coherent and monochromatic
b. Coherent and monochromatic
c. Non-coherent and non-monochromatic
d. Coherent and non-monochromatic
Answer- Coherent and monochromatic
Que- In quantum mechanics a particle is represented by a
a. Wave
b. Wave packet
c. Particle
d. None of the above
Answer- Wave packet
Que- The p wave of a normal Electrocardiogram indicates
a. Atrial depolarization
b. Ventricular repolarization
c. Atrial repolarization
d. Ventricular depolarization
Answer- Atrial depolarization
Que- Which of the following phenomenon helps to conclude that light is a transverse wave?
a. Interference
b. Diffraction
c. Polarisation
d. Refraction
Answer- Polarisation
Que- The wave like properties of electrons are useful in
a. Magnifying objects
b. Lasers
c. Weather reports
d. All of the above
Answer- Magnifying objects
Que- Who indirectly determined the mass of the electron by measuring the charge of the electron?
a. Thomson
b. Millikan
c. Rutherford
d. Einstein
Answer- Millikan
Que- When an atom loses an electron it becomes
a. Neutron
b. Negative ion
c. Positive ion
d. None of the above
Answer- Positive ion
Que- What is the size of Electron as comapared to Proton and Neutron?
a. 1/355
b. 1/1236
c. 1/1836
d. 1/1923
Answer- 1/1836
Que- The force that binds the neutrons and protons in a nucleus is called as:
a. Weak Nuclear Force
b. Strong Nuclear Force
c. Electromagnetic Force
d. Gravitational Force
Answer- Strong Nuclear Force
Que- Two rods, one of copper and other of steel, experience the same upthrust when placed in water.Thus, both have
a. Equal volume
b. Equal weight
c. Equal density
d. Equal mass
Answer- Equal volume
Que- If ice floating on water in a vessel melts, the water level in the vessel ________ .
a. Increases
b. Does not change
c. First increases before decreasing
d. Decreases
Answer- Does not change
Que- On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
a. Mercury is a metal
b. Density of mercury is greater than that of water
c. Cohesion of mercury is greater than its adhesion with glass
d. Cohesion of water is greater than its adhesion with glass
Answer- Cohesion of mercury is greater than its adhesion with glass
Que- The velocity of falling rain drops attains a terminal value because of
a. Surface tension
b. Air current
c. Upward thrust due to air
d. Viscous force exerted by air
Answer- Viscous force exerted by air
Que- Which one is the unit of surface tension of a liquid
a. Newton /m2
b. Electron volt /cm2
c. Joule/ mm
d. None of the above
Answer- Electron volt /cm2
Que- A white and smooth surface is
a. Good absorber and good reflector of heat
b. Bad absorber and good reflector of heat
c. Good absorber and bad reflector of heat
d. Bad absorber and bad reflector of heat
Answer- Bad absorber and good reflector of heat
Que- The atmosphere is heated mainly by
a. Insolation
b. Conduction
c. Radiation
d. Convection
Answer- Radiation
Que- The direction of heat flow between two objects depends on
a. Their masses
b. Their heat contents
c. Their temperatures
d. Whether they are in solid, liquid or gaseous state
Answer- Their temperatures
Que- Woollen cloth protects the body from cold because
a. It is a good conductor of heat
b. It is a poor conductor of heat
c. External heat rays enter into the body through the woollen cloth
d. It reflects heat
Answer- It is a poor conductor of heat
Que- Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.
a. Rough white
b. Rough black
c. Shining white
d. Shining black
Answer- Rough black
Que- What factors contribute to global winds?
a. Coriolis Effect
b. Convection Cells
c. Uneven warming of the earth by the sun
d. All of the above
Answer- All of the above
Que- Two metallic plate of equal thickness and coefficient thermal conductivity K1 and K2 put together face to face. A common plate is constructed. What is equivalent K?
a. K1k2/k1+k2
b. 2k1k2/k1+k2
c. K1+k2/k1k2
d. None
Answer- 2k1k2/k1+k2
Que- A spring is an example of which of these
a. Newton's 3rd law
b. Hooke's law
c. Newton's 1st law
d. Conservation of mass law
Answer- Hooke's law
Que- A copper disc has a hole. If the disc is heated, the size of the hole
a. Increases
b. Decreases
c. No change
d. First increases and than decreases
Answer- Increases
Que- Which measurement describes the pressure of a gas?
a. 450 mm Hg
b. 315 K
c. 251 g/cub.cm
d. None of the above
Answer- 450 mm Hg
Que- 1 Micron is equal to
a. 10–9 m
b. 10–12 m
c. 10–6 m
d. 10–15 m
Answer- 10–6 m
Que- Depth of ocean is measured by
a. Animometer
b. Aerometer
c. Siesmometer
d. Fathometer
Answer- Fathometer
Que- 'Parsec' is the unit measurement of
a. Density of stars
b. Astronomical distance
c. Brightness of heavenly bodies
d. Orbital velocity of giant stars
Answer- Astronomical distance
Que- Analog synthesis refers to a technology based on
a. Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.
b. Interfacing synthesizer equipment.
c. Representing data in terms of measurable physical quantities.
d. Representing physical quantities as numbers.
Answer- Representing data in terms of measurable physical quantities.
Que- Find the resistance (in mega) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200m.
a. 40
b. 4000
c. 80
d. 2000
Answer- 40
Que- A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be
a. 5 R
b. 5 R/4
c. 4 R/5
d. R/5
Answer- R/5
Que- Which of the following is a good conductor of heat but a bad conductor of electricity ?
a. Celluloid
b. Rubber
c. Asbestos
d. Mica
Answer- Mica
Que- When a number of resistors are connected in series in a circuit, the value of current:
a. Increases
b. Becomes half
c. Decreases
d. Remains the same
Answer- Remains the same
Que- A good conductor while carrying current is
a. Alternately charged positive and negative
b. Negatively charged
c. Positively charged
d. Electrically neutral
Answer- Negatively charged
Que- Sound travels at the fastest speed in
a. steel
b. water
c. air
d. vacuum
Answer- steel
Que- Oil raise up the wick in a lamp. The principle involves
a. the diffusion of oil through the wick
b. the liquid state of oil
c. capillary action phenomenon
d. volatility of oil
Answer- capillary action phenomenon
Que- Superconductors are substances which
a. conduct electricity at low temperature
b. offer high resistance to the flow of current
c. offer no resistance to the flow of electricity
d. conduct electricity at high temperatures
Answer- offer no resistance to the flow of electricity
Que- Light travels at the fastest speed in:
a. glass
b. water
c. hydrogen
d. vacuum
Answer- vacuum
Que- Railway tracks are banked on curves
a. necessary centrifugal force may be obtained from the horizontal component weight of the train
b. to avoid frictional force between the tracks and wheels
c. necessary centripetal force may be obtained from the horizontal component of the weight of the train
d. the train may not fly off in the opposite direction
Answer- necessary centripetal force may be obtained from the horizontal component of the weight of the train
Que- Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
a. X-rays
b. ultraviolet light
c. visible light
d. radio waves
Answer- visible light
Que- Out of the following pairs, which one does not have identical dimension?
a. Moment of inertia and moment of a force
b. Work and Torque
c. Angular momentum and Planck's constant
d. Impulse and Momentum
Answer- Moment of inertia and moment of a force
Que- Mercury is commonly used as a thermometric fluid rather than water because
a. specific heat of mercury is less than water
b. specific heat of mercury is more than water
c. mercury has greater visibility than water
d. density of mercury is more than the water
Answer- mercury has greater visibility than water
Que- Optical fibre works on the
a. principle of refraction
b. total internal reflection
c. scattering
d. interference
Answer- total internal reflection
Que- The intensity ratio of waves is 25 : 9. What is the ratio of their amplitudes?
a. 50 : 18
b. 25 : 9
c. 3 : 5
d. 5 : 3
Answer- 5 : 3
Que- The velocity of sound in air
a. Decreases with increase of temperature
b. Increases with decrease of temperature
c. Does not depend on temperature
d. Decreases with decrease of temperature
Answer- Decreases with decrease of temperature
Que- Infrasonic sound has a frequency lower than
a. 5 Hz
b. 15 Hz
c. 20 Hz
d. 32 Hz
Answer- 20 Hz
Que- When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to :
a. Reflection
b. Refraction
c. Forced vibrations
d. Damped vibrations
Answer- Forced vibrations
Que- Quality of a musical note depends on
a. Fundamental frequency
b. Amplitude of the wave
c. Harmonics present
d. Velocity of sound in the medium
Answer- Harmonics present
Que- When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are
a. Longitudinal
b. Transverse
c. Both longitudinal and transverse
d. Waves are not produced
Answer- Transverse
Que- When a light wave is reflected from a mirror, there is a change in its
a. Frequency
b. Amplitude
c. Wavelength
d. Velocity
Answer- Amplitude
Que- A doppler effect occurs when a source of sound moves
a. Away from you
b. Towards you
c. Both A & B
d. None of the above
Answer- Both A & B
Que- Stationary wave is formed by
a. A transverse wave superposing a longitudinal wave
b. Two waves of the same speed superposing
c. Two waves of same frequency travelling in the same direction
d. Two waves of same frequency travelling in the opposite direction
Answer- Two waves of same frequency travelling in the opposite direction
Que- Ultrasound devices operate with minimum frequency from
a. 20kHz
b. 35 kHz
c. 45 kHz
d. 60 kHz
Answer- 20kHz
Que- The source of the Sun's energy is the process of
a. Photoelectric emission
b. Nuclear fission
c. Nuclear fusion
d. Thermionic emission
Answer- Nuclear fusion
Que- Hot springs are heated geothermally by underlying
a. Water
b. Magma
c. Mitula
d. None of the above
Answer- Magma
Que- Which of the following is the cleanest source of energy?
a. Biofuel
b. Fossil fuel
c. Nuclear power
d. Wind energy
Answer- Wind energy
Que- The Solar energy produced by
a. Fusion reaction
b. Fission reaction
c. Combustion reaction
d. None
Answer- Fusion reaction
Que- The oldest type of energy known to man is
a. Wind power
b. Solar power
c. Tidal energy
d. Geothermal energy
Answer- Geothermal energy
Que- What is the phenomenon which established the transverse nature of light ?
a. Reflection
b. Interference
c. Diffraction
d. Polarisation
Answer- Polarisation
Que- Golden view of sea shell is due to
a. Diffraction
b. Dispersion
c. Polarization
d. Reflection
Answer- Polarization
Que- The light of distant stars is affected by
a. Interstellar Dust
b. The Earth's Atmosphere
c. Both A & B
d. None of the above
Answer- Both A & B
Que- A soap bubble shows colours when illuminated with white light. This is due to
a. Diffraction
b. Polarisation
c. Interference
d. Reflection
Answer- Interference
Que- Which of the following waves cannot be polarised?
a. Radio
b. Ultra violet
c. Infrared
d. Ultrasonic
Answer- Ultrasonic
Que- The coil wire in the electric room heater or electric cooking heater is called ________
a. Circuit
b. Element
c. Filament
d. Cells
Answer- Element
Que- The composition of electrician solder is
a. Lead-37%, tin-63%
b. Iron-37%, tin-63%
c. Lead-37%, Steel-63%
d. Steel-37%, copper-63%
Answer- Lead-37%, tin-63%
Que- The purpose of choke in tube light is
a. Induce high voltage
b. Induce low resistance
c. Induce high resistance
d. Induce low voltage
Answer- Induce high voltage