11. 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: B [Strong Nuclear Force]
Notes:
Strong Nuclear Force is the force that binds the neutrons and protons together in a nucleus. Nuclear forces are the strongest forces in nature are 10^38 times stronger than gravitational forces. Nuclear forces have the shortest range and operate within the nucleus only.
12. What is the phase of a vibrating particle at t = 0 known as?
[A] epoch
[B] eon
[C] Path difference
[D] Period
Answer: A [epoch]
Notes:
Initial phase or epoch is the phase of a vibrating particle at t = 0. When t = 0; Phase is the angle of epoch.
13. What is the audible range of sound for human beings?
[A] 20 Hz to 2000 Hz
[B] 200 Hz to 20000 Hz
[C] 20 Hz to 20000 Hz
[D] 2000 Hz to 20000 Hz
Answer: C [20 Hz to 20000 Hz]
Notes:
The audible range of sound for human beings extends from about 20 Hz to 20000 Hz (one Hz = one cycle/s).
14. Which of the following is the phenomenon responsible for the trade winds?
[A] Convection
[B] Conduction
[C] Radiation
[D] None of the above
Answer: A [Convection]
Notes:
The trade-wind, which is the steady surface wind on the earth blowing in from north-east towards the equator, is an example of natural convection.
15. What is a Carnot engine?
[A] A reversible refrigeration device operating between two temperatures
[B] A reversible heat engine operating between two temperatures
[C] An irreversible heat engine operating between two temperatures
[D] A reversible heat engine operating between multiple ranges of temperatures
Answer: B [A reversible heat engine operating between two temperatures]
Notes:
A reversible heat engine operating between two temperatures is called a Carnot engine.
16. In which of the following cases a concave mirror will form a virtual and erect image?
[A] When object is placed at infinity
[B] When object is at focus
[C] When object is between pole and focus
[D] None of the above
Answer: C [when object is between pole and focus]
Notes:
When the object is between pole and focus, a concave mirror will form a virtual and erect image.
17. Which of the following is true about metals?
[A] They are good conductors of electricity
[B] They have low resistivity
[C] Both a and b
[D] None of the above
Answer: C [Both a and b]
Notes:
The metals and alloys have very low resistivity in the range of 10–8 Ω m to 10–6 Ω m. They are good conductors of electricity.
18. Which of the following is correct about EMF of a cell?
[A] It is the potential difference between the electrodes when current is flowing in the cell
[B] It is the drift velocity of the electrons when there is no current in the cell
[C] It is the potential difference between the electrodes when there is no current in the cell
[D] None of the above
Answer: C [it is the potential difference between the electrodes when there is no current in the cell]
Notes:
Emf is defined as the potential difference between electrodes when there is no current in the cell (cell is in open circuit).
19. Which of the following is a suitable material for making a permanent magnet?
[A] Alnico
[B] Cobalt steel
[C] Ticonal
[D] All of the above
Answer: D [All of the above]
Notes:
Soft iron, alnico, cobalt steel and ticonal are some of the suitable materials for permanent magnets.
20. Consider the following statements:
1. An electron and Positron have the same charge (in opposite signs) and same mass
2. When a positron comes to rest in matter, it is quickly annihilated by an Electron and a gamma photon is produced.
Which among the above statements is/ are correct?
[A] Only 1 is correct
[B] Only 2 is correct
[C] Both 1 & 2 are correct
[D] Neither 1 nor 2 is correct
Answer: A [Only 1 is correct]
Notes:
The second statement has a little tweaked info. When a positron comes to rest in matter, it is quickly annihilated by an Electron and two gamma photons are produced.
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