General Science - Physics MCQs
Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examinations.
91. Which of these is used to accelerate charged particles or ions to high energies?
[A] Solenoid
[B] Cyclotron
[C] Electric motor
[D] Toroid
Show Answer
Correct Answer: B [Cyclotron]
Notes:
The cyclotron is a machine to accelerate charged particles or ions to high energies.
92. What do we call the energy which should be supplied to the nucleus to break it up into its constituent particles?
[A] Excitation energy
[B] Binding energy
[C] Ionisation energy
[D] None of the above
Show Answer
Correct Answer: B [Binding energy]
Notes:
Binding energy is the energy which should be supplied to the nucleus in order to break it up into its constituent particles.
93. What do we call the phenomenon of spontaneous disintegration of the nucleus of an atom?
[A] Nuclear Fusion
[B] Ionisation
[C] Radioactivity
[D] Covalent Bonding
Show Answer
Correct Answer: C [Radioactivity]
Notes:
Radioactivity It is the phenomenon of spontaneous disintegration of the nucleus of an atom with emission of one or more radiations
94. Which of the following is correct?
[A] 1 rutherford (Rd) = 103 decays/second
[B] 1 rutherford (Rd) = 104 decays/second
[C] 1 rutherford (Rd) = 105 decays/second
[D] 1 rutherford (Rd) = 106 decays/second
Show Answer
Correct Answer: D [1 rutherford (Rd) = 106 decays/second]
Notes:
The activity of a radioactive sample is said to be one rutherford. 1 rutherford (Rd) = 106 decays/second
95. What is meant by Atomic number of an atom?
[A] total number of protons
[B] total number of electrons in an uncharged atom
[C] Both a and b
[D] None
Show Answer
Correct Answer: C [Both a and b]
Notes:
The atomic number or proton number of a chemical element is the number of protons found in the nucleus of an atom. In an uncharged atom, the atomic number is also equal to the number of electrons.
96. Which of the following is a commonly used moderator in a Nuclear reactor?
[A] Heavy water
[B] Graphite
[C] Water
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Commonly used moderators include water, graphite and heavy water.
97. When is a p-n diode said to be forward biased?
[A] when p-side is connected to the positive terminal of the battery
[B] when n-side is connected to the positive terminal of the battery
[C] when p-side is connected to the negative terminal of the battery
[D] None of the above
Show Answer
Correct Answer: A [when p-side is connected to the positive terminal of the battery]
Notes:
When an external voltage V is applied across a semiconductor diode such that p-side is connected to the positive terminal of the battery and n- side to the negative terminal.
98. Which of these are called as Universal logic gates?
[A] NAND
[B] NOR
[C] NOT
[D] Both a and b
Show Answer
Correct Answer: D [Both a and b]
Notes:
The NAND gate and the NOR gate are called as universal gates as any Boolean function can be implemented without the need to use any other gate.
99. What is the output of an AND gate when both the inputs are 0?
[A] 0
[B] 1
[C] Either 0 or 1
[D] 2
Show Answer
Correct Answer: A [0]
Notes:
The AND gate is a basic digital logic gate that gives a LOW output If none or not all inputs to the AND gate are HIGH.
100. Which of these is used as a material for making semiconductor devices?
[A] Silicon
[B] Germanium
[C] Gallium Arsenide
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Semiconductor raw materials include germanium, gallium arsenide, silicon carbide.
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