Quiz: 12th Grade Physics Practice Paper!

50 Questions | By Jagranjosh | Last updated: Mar 19, 2022 | Total Attempts: 1019

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Quiz: 12th Grade Physics Practice Paper! - Quiz

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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.
- B.
- C.
- 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.
- B.
- C.
- D.
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 I₀cos ωt. The displacement current would be:
- A.
- B.
- C.
- D.
13.

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
14.

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
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.
- B.
- C.
- D.
19.

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
20.

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
21.

Which of the following has a small eyepiece and a large objective lens:
- A.
  
  Telescope
- B.
  
  Compound Microscope
- C.
  
  Simple Microscope
- D.
  
  Periscope
22.

In a diode, what happens at critical voltage:
- A.
  
  Zener Breakdown
- B.
  
  Saturation Current Flow
- C.
  
  Avalanche Breakdown
- D.
  
  Recombination of Charges Occur
23.

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
24.

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
25.

Device used only to check the flow of current in a circuit:
- A.
  
  Voltmeter
- B.
  
  Wheatstone Bridge
- C.
  
  Potentiometer
- D.
  
  Galvanometer