TNSB +2 Physics (Trial)

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| By Meyya22

Meyya22

Community Contributor

Quizzes Created: 6 | Total Attempts: 125,191

Questions: 10 | Attempts: 261 | Updated: Jan 21, 2023

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Questions and Answers

1.

Radiocarbon is produced in the atmosphere as a result of
- A.
  
  Collision between fast neutrons and nitrogen nuclei present in the atmosphere
- B.
  
  Action of ultraviolet light from the sun on atmospheric oxygen
- C.
  
  Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
- D.
  
  Lightning discharge in atmosphere
Correct Answer
A. Collision between fast neutrons and nitrogen nuclei present in the atmosphere

Explanation
The neutrons these are produced in atmosphere from the sun radiation i.e.cosmic rays. So that the obtained neutron is then reacts with the nitrogen which is present in the atmosphere and produce radioactive element

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2.

Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
- A.
  
  Pressure and Young's modules
- B.
  
  Planck's constant and Angular momentum
- C.
  
  Impulse and moment of force
- D.
  
  Force and rate of change of linear momentum
Correct Answer
C. Impulse and moment of force

Explanation
Impulse means change in the momentum of a body,Impulse = Ft = mv - mu The turning effect of force about the axis of rotation is called moment of force or torque.

So they don't have any units... resulting no dimensions!!

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3.

Lux is the SI unit of
- A.
  
  Intensity of illumination
- B.
  
  Luminous efficiency
- C.
  
  Luminous flux
- D.
  
  Luminous intensity
Correct Answer
A. Intensity of illumination

Explanation
The SI unit of intensity of illumination (illuminance) is the lux. An illuminance of 1.0 lux is produced by 1.0 lumen of light shining on an area of 1.0 m^2.

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4.

Moment of inertia is
- A.
  
  Vector
- B.
  
  Phasor
- C.
  
  Scalar
- D.
  
  Tensor
Correct Answer
D. Tensor

Explanation
Moment of inertia is prodct of mass and squre of radius[that is tensile strength] ie I=mc^2

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5.

Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
- A.
  
  1.8 km, 0.15 km
- B.
  
  2.2 km, 0.20 km
- C.
  
  2.8 km, 0.25 km
- D.
  
  3.3 km, 0.30 km
Correct Answer
D. 3.3 km, 0.30 km

Explanation
DISTANCE = SPEED * TIME TAKEN
d1=300*5=1500
d2=300*6=1800
maximum distance=d1+d2=3300 metres=3.3km
minimum distance=d2-d1=1800-1500=300 metres=0.3km

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6.

Stars which appear single to the naked eye but are double when seen through a telescope are
- A.
  
  Novas and supernovas
- B.
  
  Binaries
- C.
  
  Asteroids
- D.
  
  Quasars
Correct Answer
B. Binaries

Explanation
Actually at very far distances, resolving power of our eye becomes very very weak.

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7.

If the distance between two masses is increased by a factor of 4, the gravitational force of attraction between them will
- A.
  
  Reduce by a factor of 16
- B.
  
  Remain Same
- C.
  
  Reduce by a factor of 4
- D.
  
  Increase by a factor of 4
Correct Answer
A. Reduce by a factor of 16

Explanation
The gravitational force between two bodies is given by F =

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8.

A cannonball is fired horizontally at 10 m/s from a cliff. Its speed one second after being fired is about
- A.
  
  10m/s
- B.
  
  14m/s
- C.
  
  16m/s
- D.
  
  20m/s
Correct Answer
B. 14m/s

Explanation
14m/s is correct, as vector addition shows if a student knows that gain of vertical speed in 1 s is 10 m/s.

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9.

A particle is executing simple harmonic motion with frequency f. The frequency at which its kinetic energy change into potential energy is
- A.
  
  F/2
- B.
  
  F
- C.
  
  2f
- D.
  
  4f
Correct Answer
C. 2f

Explanation
In Simple Harmonic Motion, frequency of K.E. and P.E. = 2 * (Frequency of oscillating particle)

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10.

Mica is used in electrical appliances such as electric iron because mica is
- A.
  
  A good conductor of heat but a bad conductor of electricity
- B.
  
  A bad conductor of heat but a good conductor of electricity
- C.
  
  A good conductor of heat as well as electricity
- D.
  
  A bad conductor of heat as well as electricity
Correct Answer
A. A good conductor of heat but a bad conductor of electricity

Explanation
Mica is a good conductor of heat but a bad conductor of electricity, mica heats the iron's base but not give electric shock. That's why it is use in electric iron.

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Current Version
Jan 21, 2023

Quiz Edited by
ProProfs Editorial Team
Dec 12, 2013

Quiz Created by
Meyya22

Tnsb +2 Physics (Trial)

Radiocarbon is produced in the atmosphere as a result of

Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?

Lux is the SI unit of

Moment of inertia is

Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?

Stars which appear single to the naked eye but are double when seen through a telescope are

If the distance between two masses is increased by a factor of 4, the gravitational force of attraction between them will

A cannonball is fired horizontally at 10 m/s from a cliff. Its speed one second after being fired is about

A particle is executing simple harmonic motion with frequency f. The frequency at which its kinetic energy change into potential energy is

Mica is used in electrical appliances such as electric iron because mica is