Quiz: 12th Grade Physics Practice Paper!
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- 1.What would be the electric flux due to two charges one at the origin of the Gaussian sphere and another at a distance of 4b from origin. Let the radius of the Gaussian sphere be 3b and the charge be Q.
- A.
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- B.
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- C.
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- D.
0
- 2.What happens to mutual inductance of pair of coils when distance between the coils is increased:
- A.
Mutual Inductance of first coil will increase with decrease in second coil
- B.
Mutual Inductance of both the coils increases
- C.
Mutual Inductance of both the coils decreases
- D.
Mutual Inductance of second coil will increase with decrease in first coil
- 3.For a semiconductor a negative resistance could found during a:
- A.
Negative Slope
- B.
Positive Slope
- C.
Constant Slope
- D.
Variable Slope
- 4.What would be the current through the resistance which is connected to three voltage source connected in parallel to each other:
- A.
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- B.
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- C.
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- D.
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- 5.What is the reason for the damping of copper plate when it is allowed to oscillate in between the two magnetic poles:
- A.
Polarisation
- B.
Eddy Current
- C.
Amplitude Modulation
- D.
Stationary Waves
- 6.What is the S.I. Unit of Radioactivity:
- A.
Newton
- B.
Curie
- C.
Becquerel
- D.
Joule
- 7.Welders wear special goggles to protect their eyes from:
- A.
Ultraviolet Rays
- B.
Infrared Rays
- C.
Microwaves
- D.
Cosmic Rays
- 8.De Broglie waves associated with a football is not visible because:
- A.
Velocity of the football
- B.
Weight of the football
- C.
Density of the football
- D.
Mass of the football
- 9.When does a transistor act as a switch:
- A.
Collector current is kept constant
- B.
Collector current is increases
- C.
Collector current is zero
- D.
Collector current decreases
- 10.What is used to converge the light beam at a single point on the screen during diffraction:
- A.
Polaroid
- B.
Converging Lens
- C.
Diverging Lens
- D.
Prism
- 11.When a dielectric medium is introduced in between a capacitor, the capacitance:
- A.
Increases
- B.
Decreases
- C.
Constant
- D.
Becomes Negative
- 12.If the capacitor is being charged by an external ac source with an instantaneous current of I0 cos ωt. The displacement current would be:
- A.
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- B.
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- C.
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- D.
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- 13.In which phenomenon the electrons move with an average velocity which is independent of time, although the electrons are accelerated:
- A.
Resistivity
- B.
Photoelectric Effect
- C.
Drift Velocity
- D.
Interference
- 14.For drift velocity the electrons move from:
- A.
Low potential to high potential
- B.
High potential to low potential
- C.
Negative potential to zero potential
- D.
Positive potential to zero potential
- 15.A potentiometer is not affected by the internal resistance of the source because:
- A.
The internal resistance of a given cell is fixed
- B.
One of the cells is chosen as a standard cell whose emf is known to a high degree of accuracy
- C.
To maintain a steady current
- D.
It draws no current from the voltage source being measured
- 16.The air bubble inside water acts as a _____ lens
- A.
Diverging or Concave
- B.
Plane Mirror
- C.
Converging or Convex
- D.
Bi-Convex
- 17.A+B = Y denotes which Gate:
- A.
NAND Gate
- B.
OR Gate
- C.
NOR Gate
- D.
AND Gate
- 18.The condition for maximum power dissipation is:
- A.
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- B.
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- C.
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- D.
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- 19.What would be the resistance of the light bulb rated at 100 W for 220 V ac supply:
- A.
280 Ω
- B.
465 Ω
- C.
382 Ω
- D.
484 Ω
- 20.What will happen if an open circuit is used in place of the closed loop?
- A.
Flux is induced at the centre of the circuit
- B.
Flux is induced at only one of the ends of the circuit
- C.
Flux is induced across the open ends of the circuit
- D.
Flux is induced for a short period of time
- 21.If £ is the emf induced between axle and the rim of a wheel. What is the effect on emf if number of spokes were increased?
- A.
Emf is doubled
- B.
No change in Emf
- C.
Emf becomes half
- D.
Emf becomes 4 times
- 22.Device used only to check the flow of current in a circuit:
- A.
Voltmeter
- B.
Wheatstone Bridge
- C.
Potentiometer
- D.
Galvanometer
- 23.Current is flowing from east to west in a wire AB. What would be the direction of the flow of current in a wire CD parallel to AB:
- A.
East to West
- B.
North to South
- C.
West to East
- D.
South to North
- 24.Name the semiconductor device which works under the reverse bias condition:
- A.
Solar Cell
- B.
Zener Diode
- C.
Transistor
- D.
Microprocessor
- 25.In a diode, what happens at critical voltage:
- A.
Zener Breakdown
- B.
Saturation Current Flow
- C.
Avalanche Breakdown
- D.
Recombination of Charges Occur
- 26.Which of the following has a small eyepiece and a large objective lens:
- A.
Telescope
- B.
Compound Microscope
- C.
Simple Microscope
- D.
Periscope
- 27.What happens below the threshold frequency:
- A.
Partial emission of photoelectrons
- B.
Increase in photoelectric current
- C.
Decrease in photoelectric current
- D.
No emission of photoelectrons
- 28.What kind of wave are used for line of sight communication:
- A.
Sky Wave
- B.
Sound Wave
- C.
Space Wave
- D.
Light Wave
- 29.How is the intensity of transmitted light varied when the Polaroid is rotated:
- A.
Intensity doubles
- B.
Intensity becomes half
- C.
Intensity becomes four times
- D.
Intensity remains same
- 30.Endoscopy is based on the principle of:
- A.
Interference
- B.
Diffraction
- C.
Total Internal Reflection
- D.
Polarisation
- 31.A charge Q is placed at the centre of the toroid. What will be the current enclosed by the toroid:
- A.
Negative Current
- B.
Zero Current
- C.
Positive Current
- D.
Infinite Current
- 32.Which of the following will exit the cyclotron first?
- A.
Alpha particle
- B.
Proton
- C.
Deuterium Ion
- D.
Lithium ion
- 33.Which of the following is vector quantity:
- A.
Current
- B.
Electric Flux
- C.
Electric Potential
- D.
Electric dipole Moment
- 34.In an equipotential surface:
- A.
Entire charge is concentrated at the centre
- B.
No work is done to bring a test charge to a near charge
- C.
Electric field is in the opposite direction in which the potential decreases
- D.
Electric field due to induced charges opposes the external field within the conductor
- 35.Which of the following depends on the Inverse Square Law:
- A.
Ampere Circuital Law
- B.
Lenz Law
- C.
Snell’s Law
- D.
Gauss Law
- 36.Which of the following is dynamically stable in a hydrogen atom:
- A.
Centrifugal Force
- B.
Vander Waal’s Force
- C.
Centripetal Force
- D.
Gravitational Force
- 37.According to Bohr, what kind of spectrum would be emitted when an accelerating electrons revolves around the nucleus:
- A.
Line
- B.
Continuous
- C.
Radiation
- D.
Zigzag
- 38.Which of the following have a high binding energy:
- A.
Iron
- B.
Zinc
- C.
Aluminium
- D.
Uranium
- 39.The source of energy in sun and stars is:
- A.
Fission
- B.
Photon Energy
- C.
Combustion
- D.
Fusion
- 40.Neutrino detection is difficult because:
- A.
They have weak interaction with other particles
- B.
They have strong interaction with other particles
- C.
They have nuclear interaction with other particles
- D.
They have ion-ion interaction with other particles
- 41.Paschen series lies in which region?
- A.
Visible
- B.
Ultraviolet
- C.
Infrared
- D.
Microwave
- 42.Which of the following have a magnitude but not direction:
- A.
Velocity
- B.
Magnetic Field
- C.
Current
- D.
Force
- 43.Which of the following will not show polarisation:
- A.
Ultrasonic Wave
- B.
Light Wave
- C.
Micro Wave
- D.
Radio Wave
- 44.Linearly polarized light only vibrate in:
- A.
Two plane
- B.
One plane
- C.
Four plane
- D.
No plane is involved
- 45.The S.I. Unit for current sensitivity is:
- A.
Ampere
- B.
Ampere (metre)
- C.
(Ampere)-1
- D.
Ampere (metre)-1
- 46.The Square Law Device is a:
- A.
Linear Device
- B.
Closed Device
- C.
Non-Linear Device
- D.
Open Device
- 47.To what phenomenon the decay of light bulb be compared to:
- A.
Radioactive Decay
- B.
Activity Of Sample
- C.
Mean Life
- D.
Electromagnetic Radiation
- 48.The angle between the true geographic north and the magnetic north is called:
- A.
Magnetic declination
- B.
Angle of dip
- C.
Dynamo Effect
- D.
Gyro-magnetic angle
- 49.The galvanometer do not show any deflection if:
- A.
Bridge current flow to be constant
- B.
Bridge voltage to be constant
- C.
Bridge is balanced
- D.
Bridge resistance is constant
- 50.Which of the following is based on conservation of charge:
- A.
Kirchhoff’s Junction Rule
- B.
Kirchhoff’s Voltage Law
- C.
Ohm’s Law
- D.
Biot-Savart Law
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