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.

141. What is Mass defect of a nucleus?

[A] difference between mass of a nucleus and its constituents
[B] sum of the mass of a nucleus and its constituents
[C] difference between mass of a neutron and mass of proton
[D] sum of mass of a neutron and mass of proton

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142. Which of the following is a limitation of Bohr’s model of atom?

[A] it does not explain why orbits of electrons are taken as circular
[B] it does not take into account the wave nature of electrons
[C] Both a and b
[D] None

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143. What is the process which causes the elimination of one or more electrons from the atomic shell known as?

[A] Excitation
[B] Ionisation
[C] Diffusion
[D] Refraction

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144. Which of the following statements related to the unit curie (Ci) is correct?

[A] 1 Ci = 3.7 × 107
[B] 1 Ci = 2.7 × 109
[C] 1 Ci = 2.7 × 107
[D] 1 Ci = 3.7 × 1010

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145. 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

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146. 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

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147. Which of these rays have the highest penetrating power?

[A] Alpha
[B] Beta
[C] Gamma
[D] All have the same

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148. Which of the following diodes is mostly commonly used as a voltage regulator?

[A] LED
[B] Varactor diode
[C] Shockley diode
[D] Zener diode

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149. Which of these diodes is used to detect optical signals?

[A] Photodiode
[B] Light emitting diode
[C] Photovoltaic diode
[D] None of the above

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150. What is the charge of a p-type semiconductor?

[A] Positive
[B] Negative
[C] Neutral
[D] None of the above

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