MCQOPTIONS
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MCQOPTIONS
This section includes 6820 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 2101. |
The semiconductor chip used in integrated circuit is made of? |
| A. | calcium |
| B. | Carbon |
| C. | silicone |
| D. | zircon |
| Answer» D. zircon | |
| 2102. |
What are the components of an electric heater? |
| A. | plate of plaster of paris |
| B. | nichrome coil |
| C. | aluminum coil |
| D. | The wire of both (A) and (B) above |
| Answer» E. | |
| 2103. |
What is the device for converting electrical energy into mechanical energy? |
| A. | dynamo |
| B. | Transformers |
| C. | electric motor |
| D. | Inductor |
| Answer» D. Inductor | |
| 2104. |
If the distance between two electric charges is halved, then the value of the electric force between them will become? |
| A. | half |
| B. | double |
| C. | quadruple |
| D. | one fourth |
| Answer» D. one fourth | |
| 2105. |
What is the value of a kilowatt hour (kwh)? |
| A. | 3.6 x 10⁶ joules |
| B. | 6 x 10³ joules |
| C. | 10 joules |
| D. | 9 joules |
| Answer» B. 6 x 10³ joules | |
| 2106. |
In an electric press or electrical iron, the nichrome wire is wrapped over whose plate? |
| A. | silver |
| B. | Soil |
| C. | asbestos |
| D. | glass |
| Answer» D. glass | |
| 2107. |
How are lightning conductors made? |
| A. | of iron |
| B. | of aluminum |
| C. | of copper |
| D. | of steel |
| Answer» D. of steel | |
| 2108. |
Wouldn't an electric current flow between two charged objects connected to each other if they did? |
| A. | on equal footing |
| B. | on equal footing |
| C. | at the same potential |
| D. | at the same resistance |
| Answer» D. at the same resistance | |
| 2109. |
Metals are good conductors of electricity because . . . . |
| A. | they have free electrons |
| B. | their atoms are lighter |
| C. | its melting point is high |
| D. | all these |
| Answer» B. their atoms are lighter | |
| 2110. |
What is the ( S . I . ) unit of specific resistance? |
| A. | Om |
| B. | Ohm - meter -m |
| C. | ohm/meter |
| D. | Ohm - meter² |
| Answer» C. ohm/meter | |
| 2111. |
If the radius of a wire is halved, then its resistance. . . |
| A. | will be half |
| B. | will double |
| C. | one-fourth will remain |
| D. | will be sixteen times |
| Answer» E. | |
| 2112. |
Which of the following material is the best conductor of electricity? |
| A. | silver |
| B. | copper |
| C. | Gold |
| D. | asbestos |
| Answer» B. copper | |
| 2113. |
What is the algebraic sum of the currents joining at a point in a circuit? |
| A. | infinite |
| B. | Zero |
| C. | between zero and infinity |
| D. | none of these |
| Answer» C. between zero and infinity | |
| 2114. |
If an ebonite rod is rubbed with a cat's skin, then the ebonite rod - |
| A. | becomes indebted |
| B. | first negatively charged then positively charged |
| C. | remains indifferent |
| D. | gets charged |
| Answer» E. | |
| 2115. |
What are the symptoms of a superconductor? |
| A. | high permeability |
| B. | low permeability |
| C. | zero permeability |
| D. | infinite permeability |
| Answer» B. low permeability | |
| 2116. |
What is the order of the result of the electrical resistance of the human body (dry)? |
| A. | 10² ohm |
| B. | 10⁴ ohm |
| C. | 10⁶ ohm |
| D. | 10⁸ ohm |
| Answer» D. 10⁸ ohm | |
| 2117. |
If a 100 watt electric bulb burns for 10 hours, then the electricity cost will be? |
| A. | 0.1 unit |
| B. | 1 unit |
| C. | 10 units |
| D. | 100 units |
| Answer» C. 10 units | |
| 2118. |
The chemical used in a car battery is? |
| A. | hydrochloric acid |
| B. | sulfuric acid |
| C. | nitric acid |
| D. | distilled water |
| Answer» C. nitric acid | |
| 2119. |
What is the unit of kilowatt hour (KWh)? |
| A. | of energy |
| B. | of power |
| C. | electric charge |
| D. | of electric current |
| Answer» B. of power | |
| 2120. |
Approximately what part of the energy expended in a tube light is converted into light? |
| A. | 30-40% |
| B. | 40 - 50% |
| C. | 50 - 60% |
| D. | 60 - 70% |
| Answer» E. | |
| 2121. |
The total charge of a charged conductor is . . |
| A. | Remains on the inner page. |
| B. | Lives on external page. |
| C. | Some live on the inner page and some on the outer page. |
| D. | All of the above are true. |
| Answer» C. Some live on the inner page and some on the outer page. | |
| 2122. |
The work done by a unit charge in flowing from one end of the conductor to the other is called? |
| A. | inertia |
| B. | heat |
| C. | Potential difference |
| D. | voltage |
| Answer» D. voltage | |
| 2123. |
Electricity resides in mercury lamp? |
| A. | mercury at low pressure |
| B. | mercury at high pressure |
| C. | neon and mercury |
| D. | none of these |
| Answer» B. mercury at high pressure | |
| 2124. |
A fuse wire is used in an electrical circuit? |
| A. | To reduce the cost of electrical energy in transmission |
| B. | To keep the voltage level constant |
| C. | To prevent excess current flowing in the circuit |
| D. | To prevent the electrical wire from overheating |
| Answer» D. To prevent the electrical wire from overheating | |
| 2125. |
In electrical fittings a wire is grounded. this is due to? |
| A. | If there is a short circuit, the stream will go into the ground. |
| B. | It does not dissipate electricity |
| C. | This completes the electrical circuit |
| D. | This removes the electrocution of electricity |
| Answer» B. It does not dissipate electricity | |
| 2126. |
When a glass rod is rubbed with silk, the rod . . . |
| A. | becomes indebted |
| B. | first negatively charged then positively charged |
| C. | remains indifferent |
| D. | gets charged |
| Answer» E. | |
| 2127. |
The resistance of a conductor is 440 ohm. How much current will flow if it is connected to a 110 volt source? |
| A. | 0.2 A |
| B. | 0.25 A |
| C. | 4A |
| D. | 1 . 25 A |
| Answer» C. 4A | |
| 2128. |
The force between two stationary charges is directly proportional to the product of their quantities and inversely proportional to the square of the distance between them.That's the rule? |
| A. | rules of OM |
| B. | Kirchhoff's law |
| C. | coulomb's law |
| D. | Faraday's law |
| Answer» D. Faraday's law | |
| 2129. |
The length of a wire is L meter, by stretching the wire its length is made 2L meter, now the resistance of the wire will be |
| A. | twice as many |
| B. | four times the first |
| C. | a quarter of the first |
| D. | will remain unchanged |
| Answer» C. a quarter of the first | |
| 2130. |
When a soap bubble is charged, then . . . |
| A. | it shrinks |
| B. | it spreads |
| C. | There is no change in its shape |
| D. | none of the above |
| Answer» C. There is no change in its shape | |
| 2131. |
in equal charges? |
| A. | Attraction |
| B. | adhesion |
| C. | distraction |
| D. | cohesion |
| Answer» D. cohesion | |
| 2132. |
The temperature of the filament of a burning bulb electric bulb is usually? |
| A. | 100℃ to 500℃ |
| B. | 1000℃ to 1500℃ |
| C. | 2000℃ to 2500℃ |
| D. | 3000℃ to 3500℃ |
| Answer» E. | |
| 2133. |
Transformers are used? |
| A. | To convert AC to DC |
| B. | To convert DC to AC |
| C. | To oxidize DC voltage |
| D. | To oxidise or step down AC voltage |
| Answer» E. | |
| 2134. |
Which of the following are used as electrolytes in dry cells (batteries)? |
| A. | ammonium chloride and zinc chloride |
| B. | sodium chloride and calcium chloride |
| C. | Magnesium Chloride and Zinc Chloride |
| D. | ammonium chloride and calcium chloride |
| Answer» B. sodium chloride and calcium chloride | |
| 2135. |
The work done in moving a unit positive charge from one point to another in an electric circuit is measured by the distance between those points. . . |
| A. | to resistance |
| B. | to potential difference |
| C. | to the stream |
| D. | to the strength of the electric current |
| Answer» C. to the stream | |
| 2136. |
There are two bulbs in a house, one of them gives more light than the other. Which of the following statement is correct? |
| A. | Illumination of light does not depend on resistance. |
| B. | Resistance is same in both the bulbs. |
| C. | The bulb with more light has more resistance. |
| D. | The bulb with less light has more resistance in the bulb. |
| Answer» E. | |
| 2137. |
How is sound energy converted by a microphone? |
| A. | in electrical energy |
| B. | in light energy |
| C. | in magnetic energy |
| D. | in all of the above |
| Answer» B. in light energy | |
| 2138. |
Mica. . . . . . . . is ? |
| A. | poor conductor of both heat and electricity |
| B. | conductor of both heat and electricity |
| C. | poor conductor of heat and conductor of electricity |
| D. | conductor of heat and poor conductor of electricity |
| Answer» B. conductor of both heat and electricity | |
| 2139. |
Using a fuse wire. . . . Happens for? |
| A. | to pass high current without causing harm |
| B. | breaking of electric circuit during excessive current flow |
| C. | protect a person from electric shock |
| D. | none of the above |
| Answer» C. protect a person from electric shock | |
| 2140. |
If a 100 watt bulb is lit for 5 hours a day, how much will it cost at 50 paise per unit in 30 days? |
| A. | Rs 10.50 |
| B. | 8. Rs 50 |
| C. | 7. Rs 50 |
| D. | 9. Rs 50 |
| Answer» D. 9. Rs 50 | |
| 2141. |
What is the effect on the electrical resistance and electrical conductivity of conducting materials on increasing the temperature? |
| A. | The electrical resistance increases while the electrical conductivity decreases. |
| B. | The electrical resistance decreases while the electrical conductivity increases. |
| C. | The electrical resistance and electrical conductivity both increase. |
| D. | The electrical resistance and electrical conductivity both decrease. |
| Answer» B. The electrical resistance decreases while the electrical conductivity increases. | |
| 2142. |
What are the characteristics of a fuse wire? |
| A. | high resistance and high melting point |
| B. | low resistance and low melting point |
| C. | high resistance and low melting point |
| D. | low resistance and high melting point |
| Answer» D. low resistance and high melting point | |
| 2143. |
The most commonly used object in fluorescence tube is |
| A. | sodium oxide and argon |
| B. | sodium vapor and neon |
| C. | mercury vapor and argon |
| D. | mercuric oxide and neon |
| Answer» D. mercuric oxide and neon | |
| 2144. |
In the process of electrolysis, the amount of matter liberated at an electrode is directly proportional to the total charge flowing.That's the rule? |
| A. | Faraday's first law of electrolysis |
| B. | Faraday's second law of electrolysis |
| C. | Faraday's third law of electrolysis |
| D. | none of the above |
| Answer» B. Faraday's second law of electrolysis | |
| 2145. |
What material is the wire usually used for installing a safety fuse made of? |
| A. | tin |
| B. | lead |
| C. | Nickel |
| D. | an alloy of tin and lead |
| Answer» E. | |
| 2146. |
Fluorescent tube is preferred over electric bulb because . . . |
| A. | Its illumination surface is large. |
| B. | The increase or decrease in voltage does not affect it. |
| C. | The electrical energy in the tube is almost completely converted into light energy. |
| D. | Its light is not harmful to the eyes. |
| Answer» D. Its light is not harmful to the eyes. | |
| 2147. |
What is the principle of Fuse? |
| A. | electrochemical effect |
| B. | Mechanical effect of electricity |
| C. | thermal effect of electricity |
| D. | electromagnetic effect of electricity |
| Answer» D. electromagnetic effect of electricity | |
| 2148. |
Nichrome wire is used as a heating element because . . . |
| A. | Its strings can be pulled. |
| B. | Its specific resistance is high. |
| C. | Does not form oxide when red hot. |
| D. | Due to both 2 and 3 above |
| Answer» E. | |
| 2149. |
Why is the air completely removed from the electric bulb? |
| A. | To prevent oxidation of tungsten filament |
| B. | to prevent the bulb from bursting |
| C. | To prevent loss of light due to absorption |
| D. | none of the above |
| Answer» B. to prevent the bulb from bursting | |
| 2150. |
An electric fuse wire must possess which of the following set of properties for general applications? |
| A. | Thick wire, High melting point alloy, Short length |
| B. | Thicker wire, lower melting point alloy, longer length |
| C. | Low Length, Low Melting Point Alloy, Thin Wire |
| D. | Longer length, lower melting point alloy, thinner wire |
| Answer» D. Longer length, lower melting point alloy, thinner wire | |