MCQOPTIONS
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MCQOPTIONS
This section includes 563 Mcqs, each offering curated multiple-choice questions to sharpen your General Knowledge (GK) knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Stars appear twinkling because of ______ of light. |
| A. | Reflection |
| B. | Scattering |
| C. | Emission |
| D. | Absorption |
| Answer» C. Emission | |
| 102. |
What is the reason for twinkling of stars? |
| A. | Dispersion of light |
| B. | Total internal reflection |
| C. | Atmospheric reflection |
| D. | Atmospheric refraction |
| Answer» E. | |
| 103. |
The information of brilliant colors in a thin soap film is a consequence of the phenomena of - |
| A. | Polarization and interference |
| B. | Diffraction and dispersion |
| C. | Multiple refraction and dispersion |
| D. | Multiple reflection and interference |
| Answer» E. | |
| 104. |
If an ordinary glass tube and a glass capillary tube are 'both clipped in a beaker of water, water rises in |
| A. | both |
| B. | only the glass tube |
| C. | only the capillary tube |
| D. | neither |
| Answer» B. only the glass tube | |
| 105. |
The purpose of choke in a fluorescent lamp is |
| A. | to increase the current flow |
| B. | to decrease the current flow |
| C. | to decrease the resistance |
| D. | to decrease the voltage momentarily |
| Answer» C. to decrease the resistance | |
| 106. |
Stars appears to move from east to west because - |
| A. | all stars move from east to west |
| B. | the earth rotates from west to east |
| C. | the earth rotates from east to west |
| D. | the background of the stars moves from west to east |
| Answer» C. the earth rotates from east to west | |
| 107. |
Before X-ray examination (coloured X- ray) of the stomach, patients are given suitable salt of barium because. |
| A. | barium is a good absorber of X-rays and helps stomach to appear clearly |
| B. | barium salts are white in colour and this helps stomach to appear clearly |
| C. | barium allows X-rays to pass through the stomach |
| D. | barium salts are easily available |
| Answer» B. barium salts are white in colour and this helps stomach to appear clearly | |
| 108. |
Every hot object emits |
| A. | X-rays |
| B. | Visible light |
| C. | Infrared rays |
| D. | Ultraviolet rays |
| Answer» D. Ultraviolet rays | |
| 109. |
At low temperature, Lead behaves as a |
| A. | Semi conductor |
| B. | Super conductor |
| C. | Insulator |
| D. | Conductor |
| Answer» C. Insulator | |
| 110. |
Who among the following evolved the concept of relationship between mass and energy? |
| A. | Einstein |
| B. | Planck |
| C. | Dalton |
| D. | Rutherford |
| Answer» B. Planck | |
| 111. |
How many terminals do an electric cell has? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 112. |
Receptors used to detect taste are known as - |
| A. | Gustatory receptors |
| B. | Olfactory receptors |
| C. | Nerve cell receptors |
| D. | All of the above |
| Answer» B. Olfactory receptors | |
| 113. |
When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is - |
| A. | the violet ray |
| B. | the red ray |
| C. | the green ray |
| D. | the blue ray |
| Answer» C. the green ray | |
| 114. |
The speed of light will be minimum while passing through - |
| A. | water |
| B. | vaccum |
| C. | air |
| D. | glass |
| Answer» E. | |
| 115. |
Which of the following is an ex-ample for cantilever beam? |
| A. | Diving board |
| B. | Bridge |
| C. | See-saw |
| D. | Common balance |
| Answer» C. See-saw | |
| 116. |
Certain substances loose their electrical resistance completely at super low temperature. Such, substances are called. |
| A. | Super conductors |
| B. | Semi conductors |
| C. | Dielectrics |
| D. | Perfect conductors |
| Answer» B. Semi conductors | |
| 117. |
A radioactive substance emits? |
| A. | alpha particle |
| B. | beta particle |
| C. | gamma particle |
| D. | all of the three |
| Answer» E. | |
| 118. |
For which one of the following, "Diodes' are generally used for? |
| A. | Rectification |
| B. | Amplification |
| C. | Modulation |
| D. | Filtration |
| Answer» B. Amplification | |
| 119. |
Which of the following devices can be used to detect radiant heat? |
| A. | Liquid thermometer |
| B. | Six's maximum and minimum thermometer |
| C. | Constant volume air thermometer |
| D. | Thermopile |
| Answer» E. | |
| 120. |
Which of the following circuit elements is used to 'block' DC in an electronic circuit? |
| A. | Resistances |
| B. | Capacitance |
| C. | Inductance |
| D. | Diode |
| Answer» C. Inductance | |
| 121. |
In which one of the following the phenomenon of total internal reflection of light is used? |
| A. | Formation of mirage |
| B. | Working of binoculars |
| C. | Formation of rainbow |
| D. | Twinkling of stars |
| Answer» D. Twinkling of stars | |
| 122. |
A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is - |
| A. | the same in both cases in all respects |
| B. | of higher intensity when train arrives |
| C. | of higher pitch when train arrives |
| D. | of higher pitch when train departs |
| Answer» D. of higher pitch when train departs | |
| 123. |
When a bottle of perfume is opened in one corner of a room the smell spreads soon throughout the room. This is an example of - |
| A. | surface tension |
| B. | capillarit |
| C. | viscosity |
| D. | diffusion |
| Answer» B. capillarit | |
| 124. |
Which, of the following radiations has the least wavelength? |
| A. | X-rays |
| B. | a-rays |
| C. | g-rays |
| D. | b-rays |
| Answer» D. b-rays | |
| 125. |
Which of the following are bad conductors of electricity? |
| A. | Mica and Quartz |
| B. | Metals and Rubber |
| C. | Metals and Mica |
| D. | Mica and Rubber |
| Answer» B. Metals and Rubber | |
| 126. |
A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously? |
| A. | They must have the same volume |
| B. | They must have the same density |
| C. | They must have the same mass |
| D. | They must be dropped in vacuum |
| Answer» E. | |
| 127. |
A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will - |
| A. | Increase |
| B. | decrease |
| C. | remain unaffected |
| D. | have its shape changed |
| Answer» B. decrease | |
| 128. |
A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths will be traversed by the particle? |
| A. | Circle |
| B. | Parabolic |
| C. | Great circle |
| D. | Hyper-parabolic |
| Answer» C. Great circle | |
| 129. |
If electrical conductivity increases with the increase of temperature of a substance, then it is a |
| A. | Conductor |
| B. | Semiconductor |
| C. | Insulator |
| D. | Carborator |
| Answer» C. Insulator | |
| 130. |
If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be - |
| A. | R/4 |
| B. | R/2 |
| C. | R |
| D. | 2R |
| Answer» B. R/2 | |
| 131. |
If ice floating on water in a vessel melts, the water level in the vessel . |
| A. | increases |
| B. | does not change |
| C. | first increases before decreasing |
| D. | decreases |
| Answer» C. first increases before decreasing | |
| 132. |
An ice block with a piece of lead embedded in it floats in water. If ice melts the water level |
| A. | Rises |
| B. | Falls |
| C. | Remains same |
| D. | Falls first and them rises |
| Answer» C. Remains same | |
| 133. |
A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will - |
| A. | first rise and then fall |
| B. | fall |
| C. | remain the same |
| D. | rise |
| Answer» D. rise | |
| 134. |
If ice floating on water in a vessel melts, the water level in the vessel - |
| A. | increases |
| B. | does not change |
| C. | first increases before decreasing |
| D. | decreases |
| Answer» C. first increases before decreasing | |
| 135. |
Why does a black board appears black in color? |
| A. | It reflects black color |
| B. | It absorbs black color |
| C. | It reflects all colors |
| D. | It absorbs all the colours |
| Answer» E. | |
| 136. |
Which law states, "The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings"? |
| A. | Doppler's Effect |
| B. | Newton's law of cooling |
| C. | Kirchhoff's Law |
| D. | Stefan's Law |
| Answer» C. Kirchhoff's Law | |
| 137. |
Which law states, "The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings." |
| A. | Doppler's Effect |
| B. | Newton's law of cooling |
| C. | Kirchhoff's Law |
| D. | Stefan's Law |
| Answer» C. Kirchhoff's Law | |
| 138. |
Which law states, The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings. |
| A. | Doppler s Effect |
| B. | Newton s law of cooling |
| C. | Kirchhoff s Law |
| D. | Stefan s Law |
| Answer» C. Kirchhoff s Law | |
| 139. |
Which of the following principle is used to produce low-temperatures'? |
| A. | Super conductivity |
| B. | Joule-Kelvin effect |
| C. | Thermo-electric effect |
| D. | Adiabatic demagnetization |
| Answer» E. | |
| 140. |
The device used to change the speed of an electric fan is |
| A. | Amplifier |
| B. | Regulator |
| C. | Switch |
| D. | Rectifier |
| Answer» C. Switch | |
| 141. |
A device used for converting A.C. into D.C. is called |
| A. | Transformer |
| B. | Rectifier |
| C. | Induction coil |
| D. | Dynamo |
| Answer» C. Induction coil | |
| 142. |
Remote-sensing device has an inbuilt source of |
| A. | X-ray |
| B. | g-ray |
| C. | Ultraviolet ray |
| D. | Infrared ray |
| Answer» E. | |
| 143. |
During combustion of unsaturated compounds a is seen. |
| A. | clean flame |
| B. | blue flame |
| C. | red flame |
| D. | yellow flame |
| Answer» E. | |
| 144. |
Which of the following is a good conductor of heat but bad conductor of electricity? |
| A. | mica |
| B. | asbestos |
| C. | celluloid |
| D. | paraffin wax |
| Answer» B. asbestos | |
| 145. |
Total internal reflection can not take place when light goes from |
| A. | glass to water |
| B. | water to glass |
| C. | water to air |
| D. | glass to air |
| Answer» C. water to air | |
| 146. |
Why are we able to hear short wave broadcasts better than long wave broadcasts? |
| A. | Short waves are more energetic than long waves |
| B. | Short waves are unaffected by atmospheric disturbances |
| C. | Short wave broadcasts are made by nearby radio stations |
| D. | By convention, short waves are meant for long distances, whereas long waves are reserved for short distances |
| Answer» B. Short waves are unaffected by atmospheric disturbances | |
| 147. |
A Fuse wire is characterized by |
| A. | High resistance and low melting point |
| B. | High resistance and high melting point |
| C. | Low resistance and high melting point |
| D. | Low resistance and low melting point |
| Answer» E. | |
| 148. |
An alloy is an example of : |
| A. | Colloidal solution |
| B. | Emulsion |
| C. | Solid solution |
| D. | Heterogeneous mixture |
| Answer» D. Heterogeneous mixture | |
| 149. |
The 'Abolition of Titles' is a fundamental right classified under: |
| A. | Right against Exploitation |
| B. | Right to Freedom |
| C. | Right to equality |
| D. | Right to freedom of religion |
| Answer» D. Right to freedom of religion | |
| 150. |
Stereo was invented by . |
| A. | John Barber |
| B. | Tim Berners-Lee |
| C. | Alan Blumlein |
| D. | David Brewster |
| Answer» D. David Brewster | |