MCQOPTIONS
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MCQOPTIONS
This section includes 145 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The strongest force in the nature is |
| A. | Electric force |
| B. | Gravitational force |
| C. | Nuclear force |
| D. | Magnetic force |
| Answer» D. Magnetic force | |
| 102. |
Which of the following has the longest de Broglie wavelength if they are moving with same velocity ? |
| A. | Neutron |
| B. | Proton |
| C. | - particle |
| D. | - particle |
| Answer» E. | |
| 103. |
Nuclear fusion is the source of energy in |
| A. | Sun and atom bomb |
| B. | Nuclear reactor and sun |
| C. | Sun and hydrogen bomb |
| D. | Nuclear reactor and atom bomb |
| Answer» E. | |
| 104. |
The matter waves are |
| A. | e.m. waves |
| B. | Sound waves |
| C. | Mechanical waves |
| D. | Probability waves |
| Answer» E. | |
| 105. |
The velocity of photo electron emitted in photoelectric effect depends only on |
| A. | The frequency and intensity of incident light |
| B. | The frequency of inicdent light |
| C. | Both (a) and (b) |
| D. | The wave length of incident light |
| Answer» E. | |
| 106. |
Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is |
| A. | To control the energy released in the reactor |
| B. | To absorb neutrons and stop the chain reaction |
| C. | To cool the reactor |
| D. | To slow down the neutrons to thermal energy |
| Answer» E. | |
| 107. |
Direct conversion of solar energy with the use of photovoltaic cell results in the production of |
| A. | Optical energy |
| B. | Electrical energy |
| C. | Thermal energy |
| D. | Mechanical energy |
| Answer» C. Thermal energy | |
| 108. |
Nuclear forces are mediated by |
| A. | Proton |
| B. | Neutron |
| C. | Meson |
| D. | Electron |
| Answer» D. Electron | |
| 109. |
Nuclear forces are |
| A. | Spin dependent |
| B. | Charge dependent |
| C. | Long range |
| D. | None of these |
| Answer» B. Charge dependent | |
| 110. |
Photoelectric effect supports quantum nature of light because |
| A. | There is a minimum frequency of light below which no photoelectrons are emitted |
| B. | The maximum KE of photoelectrons depends only on the frequency of light and hot on its intensity |
| C. | Even when the metal surface is faintly illuminated, the photoelectrons leave the surface immediately |
| D. | Electric charge of the photoelectrons is quantised |
| Answer» B. The maximum KE of photoelectrons depends only on the frequency of light and hot on its intensity | |
| 111. |
Out of the following, the one which can pass through 20 cm thickness of steel is |
| A. | - rays |
| B. | - rays |
| C. | y - rays |
| D. | ultraviolet rays |
| Answer» D. ultraviolet rays | |
| 112. |
The colour of the + ve column in a gas discharge tube depends on |
| A. | The type of glass used to construct the tube |
| B. | The gas in the tube |
| C. | The applied voltage |
| D. | The material of the cathode |
| Answer» C. The applied voltage | |
| 113. |
Which of the following is not the property of cathode rays ? |
| A. | At produces heating effect |
| B. | It does not deflect in electric field |
| C. | Its casts shadow |
| D. | It produces fluorescence |
| Answer» C. Its casts shadow | |
| 114. |
The maximum number of photo electrons released in photocell is independent of |
| A. | Nature of the cathode surface |
| B. | Frequency of incident ray |
| C. | Intensity of radiations incident on cathode surface |
| D. | None of the above |
| Answer» C. Intensity of radiations incident on cathode surface | |
| 115. |
When yellow light is incident on a surface no electrons are emitted while green light can emit. If red light is incident on the surface then |
| A. | No electrons are emitted |
| B. | Photons are emitted |
| C. | Electrons of higher energy are emitted |
| D. | Electrons of lower energy are emitted |
| Answer» B. Photons are emitted | |
| 116. |
Particles which can be added to the nucleus of an atom without changing its chemical properties are |
| A. | Electrons |
| B. | Protons |
| C. | Neutrons |
| D. | -particles |
| Answer» D. -particles | |
| 117. |
When the speed of electrons increases, then the value of the specific charge on an electron |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | None of these |
| Answer» C. Remains unchanged | |
| 118. |
The cause of fractional atomic weights of elements is the presence of |
| A. | Isobars |
| B. | Isotopes |
| C. | isotones |
| D. | None of these |
| Answer» C. isotones | |
| 119. |
Which of the particles has similar mass to that of the electron ? |
| A. | Proton |
| B. | Neutron |
| C. | Positron |
| D. | Neutrino |
| Answer» D. Neutrino | |
| 120. |
An atom bomb is based upon the principle of |
| A. | Nuclear fission |
| B. | Nuclear fusion |
| C. | Controlled chain reaction |
| D. | None of the above |
| Answer» B. Nuclear fusion | |
| 121. |
In photoelectric effect, the number of photo electrons emitted is proportional to |
| A. | Intensity of incident beam |
| B. | Frequency of incident beam |
| C. | Velocity of incident beam |
| D. | Work function of photo cathode |
| Answer» B. Frequency of incident beam | |
| 122. |
Which is the incorrect statement of the following ? |
| A. | Photon is a particle with zero rest mass |
| B. | Photon is a particle with zero momentum |
| C. | Photon travels with velocity of light in vacuum |
| D. | Photon even feel the pull of gravity |
| Answer» C. Photon travels with velocity of light in vacuum | |
| 123. |
Alpha rays emitted from a radioactive substance are |
| A. | Negatively charged particles |
| B. | Hydrogen nuclear |
| C. | Helium nuclear |
| D. | None of the above |
| Answer» D. None of the above | |
| 124. |
Which of the following will deflect in electric field ? |
| A. | Y - rays |
| B. | X - rays |
| C. | Cathode rays |
| D. | Ultraviolet rays |
| Answer» D. Ultraviolet rays | |
| 125. |
Cathode rays are similar to visible light rays, in that |
| A. | They both can be deflected by electric and magnetic fields |
| B. | They both have a definite magnitude of wavelength |
| C. | They both can ionise the gas through which they pass |
| D. | They both can affect photographic plates |
| Answer» E. | |
| 126. |
Isotopes have the same |
| A. | Atomic number |
| B. | Mass number |
| C. | avogadro's number |
| D. | None of these |
| Answer» B. Mass number | |
| 127. |
The mass defect per nucleon is called |
| A. | Binding energy |
| B. | Packing fraction |
| C. | Ionization energy |
| D. | Excitation energy |
| Answer» C. Ionization energy | |
| 128. |
The nuclear force |
| A. | Obeys inverse square law of distance |
| B. | Obeys inverse third power law of distance |
| C. | Is a short range force |
| D. | Is equal in strength to the electromagnetic force |
| Answer» D. Is equal in strength to the electromagnetic force | |
| 129. |
Beta rays emitted by radioactive substance are |
| A. | Electromagnetic radiations |
| B. | Charged particles emitted by the nucleus |
| C. | Electrons orbiting around the nucleus |
| D. | None of the above |
| Answer» C. Electrons orbiting around the nucleus | |
| 130. |
In nuclear reaction, there is conservation of |
| A. | Mass only |
| B. | Energy only |
| C. | Momentum only |
| D. | Mass energy and momentum |
| Answer» E. | |
| 131. |
If alpha, beta and gamma rays carry same momentum, which has the longest wavelength ? |
| A. | Alpha rays |
| B. | Beta rays |
| C. | Gamma rays |
| D. | None, all have same wavelength |
| Answer» E. | |
| 132. |
The dual nature of light is exhibited by |
| A. | Diffraction and photoelectric effect |
| B. | Diffraction and reflection |
| C. | Refraction and interference |
| D. | Photoelectric effect |
| Answer» B. Diffraction and reflection | |
| 133. |
The wavelength of the matter waves is independent of |
| A. | Charge |
| B. | Momentum |
| C. | Velocity |
| D. | Mass |
| Answer» B. Momentum | |
| 134. |
The main source of solar energy is |
| A. | Nuclear fission |
| B. | Nuclear fusion |
| C. | Combustion |
| D. | None of these |
| Answer» C. Combustion | |
| 135. |
The important conclusion given by Millikan's experiment about the charge is |
| A. | Charge is never quantized |
| B. | Charges has no definite value |
| C. | Charge is quantized |
| D. | Charge on oil drop always increases |
| Answer» D. Charge on oil drop always increases | |
| 136. |
Voltage applied between the electrodes of discharge tube is of the nature |
| A. | 220 V alternating voltage |
| B. | 220 V DC voltage |
| C. | Variable voltage |
| D. | Voltage obtained by induction coil |
| Answer» E. | |
| 137. |
Hydrogen bomb is based upon the principle of |
| A. | Nuclear fission |
| B. | Nuclear fusion |
| C. | Controlled nuclear fission |
| D. | None of the above |
| Answer» C. Controlled nuclear fission | |
| 138. |
The mass energy relation is the out come of |
| A. | Quantum theory |
| B. | General theory of relativity |
| C. | Field theory of relativity |
| D. | Special theory of relativity |
| Answer» E. | |
| 139. |
Nuclear fission experiments show that the neutrons split the uranium nucleus into two fragments of about the same size. The process is accompanied by the emission of several |
| A. | Protons and positrons |
| B. | - particles |
| C. | Neutrons |
| D. | Protons and -particles |
| Answer» D. Protons and -particles | |
| 140. |
In a discharge tube, ionization of enclosed gas is produced due to collisions between |
| A. | Neutral gas atoms / molecules |
| B. | Positive ions and neutral atoms / molecules |
| C. | Negative electrons and neutral atoms / molecules |
| D. | Photons and neutral atoms / molecules |
| Answer» D. Photons and neutral atoms / molecules | |
| 141. |
The phenomenon of ejection of electrons from the surface of metals, when light of suitable wavelength falls on it, is known as |
| A. | Electrolysis |
| B. | Ionization |
| C. | Photo electric effect |
| D. | None of these |
| Answer» D. None of these | |
| 142. |
Which of the following phenomena is observed when black discharge occurs in a discharge tube ? |
| A. | The wall of the tube opposite to the cathode glow |
| B. | Striations are seen |
| C. | A glow appears at the cathode |
| D. | Positive column appears |
| Answer» B. Striations are seen | |
| 143. |
In a nuclear reactor, cadmium rods are used to |
| A. | Speed up neutrons |
| B. | Slow down neutrons |
| C. | Absorb neutrons |
| D. | Produce neutrons |
| Answer» D. Produce neutrons | |
| 144. |
Cathode rays enter an electric field normal to the lines of force. Then their path in the electric field is |
| A. | Straight line |
| B. | Ellipse |
| C. | Circle |
| D. | Parabola |
| Answer» E. | |
| 145. |
The ratio of specific charges of an - particle to that of a proton is |
| A. | 1 / 3 |
| B. | 1 / 2 |
| C. | 1 / 1 |
| D. | 2 / 1 |
| Answer» C. 1 / 1 | |