MCQOPTIONS
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MCQOPTIONS
This section includes 1134 Mcqs, each offering curated multiple-choice questions to sharpen your Grade10 knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
In electrolyte, the current is produced due to the flow of |
| A. | positive charges only |
| B. | negative charges only |
| C. | no charges |
| D. | positive and negative charges |
| Answer» E. | |
| 552. |
2 resistances of 4kΩ and 6kΩ are joined in series, if a battery of 10 V is connected across the ends, then equivalent resistance of the series combination should be |
| A. | 15kΩ |
| B. | 10kΩ |
| C. | 2kΩ |
| D. | 24kΩ |
| Answer» C. 2kΩ | |
| 553. |
We can use the formula[ (watt × time of use in hours)/1000 × the cost of one unit] to find the amount of |
| A. | income tax |
| B. | electricity bill |
| C. | sales tax |
| D. | none of above |
| Answer» C. sales tax | |
| 554. |
As the temperature rises, the resistance of the thermistor |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | none of above |
| Answer» B. increases | |
| 555. |
The induced charge on insulators |
| A. | resides on surface |
| B. | move inside |
| C. | change into electric current |
| D. | moves outwards |
| Answer» B. move inside | |
| 556. |
In a light bulb of 60 W, the current in a bulb fluctuates in each second |
| A. | 50 times |
| B. | 100 times |
| C. | 25 times |
| D. | 70 times |
| Answer» B. 100 times | |
| 557. |
Per year safe limit of radiation exposure is |
| A. | 5 rem |
| B. | 10 rem |
| C. | 7 rem |
| D. | 15 rem |
| Answer» B. 10 rem | |
| 558. |
The half-life of a radioactive element is 10 minutes. If the initial count rate is 368 counts per minute, then the time for which count rate reaches 46 counts per minute would be? |
| A. | 30 minutes |
| B. | 40 minutes |
| C. | 15 minutes |
| D. | 23 minutes |
| Answer» B. 40 minutes | |
| 559. |
In each fission event, the energy released is about |
| A. | 100 MeV |
| B. | 300 MeV |
| C. | 400 MeV |
| D. | 200 MeV |
| Answer» E. | |
| 560. |
To create a shower of secondary radiation, the cosmic radiation interacts with |
| A. | atoms |
| B. | electrons |
| C. | protons |
| D. | neutrons |
| Answer» B. electrons | |
| 561. |
The atoms of an element which have the same number of protons but different number of neutrons in their nuclei are known as |
| A. | ions |
| B. | isotopes |
| C. | radiant |
| D. | electrons |
| Answer» C. radiant | |
| 562. |
A body in the gravitational field always tends to move from a point of potential energy |
| A. | higher to lower |
| B. | lower to higher |
| C. | in straight line |
| D. | not in straight line |
| Answer» B. lower to higher | |
| 563. |
If 2 bodies are oppositely charged with 400µC and 200µC, the distance between them in the air is 0.5 m. The force between the bodies should be |
| A. | 2880 N |
| B. | 3000 N |
| C. | 1850 N |
| D. | 3250 N |
| Answer» B. 3000 N | |
| 564. |
Electric field intensity is a |
| A. | base quantity |
| B. | scaler quantity |
| C. | non vector quantity |
| D. | vector quantity |
| Answer» E. | |
| 565. |
SI unit of electric potential is |
| A. | C-1 |
| B. | J-1 |
| C. | JC-1 |
| D. | JC-4 |
| Answer» D. JC-4 | |
| 566. |
3 capacitors with capacitances 5µ F, 6µ F and 7µ F are arranged in series combination with a battery of 5V, as 1µ F = 10-6F, the total capacitance should be |
| A. | 2.8 µF |
| B. | 1.5 µF |
| C. | 2.3 µF |
| D. | 1.96 µF |
| Answer» E. | |
| 567. |
The positive terminal of the battery is connected to the voltmeter's |
| A. | neutral terminals |
| B. | negative terminal |
| C. | positive terminal |
| D. | none of above |
| Answer» D. none of above | |
| 568. |
In a light bulb of 60 W, the current in a bulb fluctuates 50 times in each second between |
| A. | −0.51 A to 0.51 A |
| B. | −0.61 A to 0.61 A |
| C. | −0.71 A to 0.71 A |
| D. | −0.81 A to 0.81 A |
| Answer» D. −0.81 A to 0.81 A | |
| 569. |
The current which changes its direction of flow after regular intervals of time is called |
| A. | negative current |
| B. | direct current |
| C. | alternative current |
| D. | fixed current |
| Answer» D. fixed current | |
| 570. |
A sensitive instrument that detects current in a circuit and always connected in series with the circuit is called |
| A. | Vernier calipers |
| B. | galvanometer |
| C. | ammeter |
| D. | voltmeter |
| Answer» C. ammeter | |
| 571. |
The time during which half of the unstable radioactive nuclei disintegrate of the sample of a radioactive element is called the |
| A. | full life |
| B. | half life |
| C. | double life |
| D. | quarter life |
| Answer» C. double life | |
| 572. |
The positive charge in an atom was concentrated in |
| A. | nucleus |
| B. | shells |
| C. | outside shells |
| D. | between shells |
| Answer» B. shells | |
| 573. |
For curing cancerous tumors and cells, doctors use |
| A. | radioactive cobalt-60 |
| B. | radioactive cobalt-80 |
| C. | radioactive cobalt-90 |
| D. | radioactive cobalt-50 |
| Answer» B. radioactive cobalt-80 | |
| 574. |
The activity of 1 gram of radium is |
| A. | 3.73 × 104 MBq |
| B. | 4.58 × 104 MBq |
| C. | 1.69 × 104 MBq |
| D. | 2.56 × 104 MBq |
| Answer» B. 4.58 × 104 MBq | |
| 575. |
The simplest atom with a single proton is of |
| A. | nitrogen |
| B. | helium |
| C. | carbon |
| D. | hydrogen |
| Answer» E. | |
| 576. |
In the absence of an external source, no current passes through the conductor due to the electron's |
| A. | random motion |
| B. | circular motion |
| C. | vibratory motion |
| D. | linear motion |
| Answer» B. circular motion | |
| 577. |
A large amount of current passes through earth wire because it has |
| A. | very low resistance |
| B. | very high resistance |
| C. | high frequency |
| D. | low frequency |
| Answer» B. very high resistance | |
| 578. |
The amount of heat generated in resistance due to the flow of charges is equal to the product of the square of current, resistance and the time duration. This statement is known as |
| A. | Ohm's law |
| B. | Joule's law |
| C. | Newton's law |
| D. | Pascal's law |
| Answer» C. Newton's law | |
| 579. |
The ground wire carries |
| A. | current |
| B. | no electricity |
| C. | frequency |
| D. | voltage |
| Answer» C. frequency | |
| 580. |
By coupling the output of the OR gate with the NOT gate, we get |
| A. | AND gate |
| B. | NOR gate |
| C. | NAND gate |
| D. | NOT gate |
| Answer» C. NAND gate | |
| 581. |
By coupling a NOT gate with the output terminal of the AND gate, we get |
| A. | AND gate |
| B. | OR gate |
| C. | NAND gate |
| D. | NOT gate |
| Answer» D. NOT gate | |
| 582. |
A signal that can have only two discrete values is called a |
| A. | Wi-Fi signal |
| B. | current signal |
| C. | digital signal |
| D. | analogue signal |
| Answer» D. analogue signal | |
| 583. |
The number of free electrons in metals is |
| A. | very few |
| B. | zero |
| C. | very large |
| D. | average |
| Answer» D. average | |
| 584. |
A high voltage in digital electronics is represented as |
| A. | 1 |
| B. | 0 |
| C. | 2 |
| D. | 4 |
| Answer» B. 0 | |
| 585. |
The quantities that we perceive by our senses are usually |
| A. | positive quantities |
| B. | digital quantities |
| C. | negative quantities |
| D. | analogue quantities |
| Answer» E. | |
| 586. |
The output of two-input NOR gate is 1 when |
| A. | A = 1, B = 0 |
| B. | A = 0, B = 1 |
| C. | A = 0, B = 1 |
| D. | A = 1,B = 1 |
| Answer» D. A = 1,B = 1 | |
| 587. |
The process of transforming information into 1's and 0's is called |
| A. | encoding |
| B. | decoding |
| C. | digitization |
| D. | symbolling |
| Answer» D. symbolling | |
| 588. |
When the beam of electrons is passed between the pates having an electric field, the beam deflects towards |
| A. | negative plate |
| B. | positive plate |
| C. | goes straight |
| D. | neutral plate |
| Answer» C. goes straight | |
| 589. |
The grid in the electron gun is connected to |
| A. | both negative and positive potentials |
| B. | positive potential |
| C. | negative potential |
| D. | no potential |
| Answer» D. no potential | |
| 590. |
Things which can have two possible states are known as |
| A. | analogue variables |
| B. | binary variables |
| C. | dependent variables |
| D. | independent variables |
| Answer» C. dependent variables | |
| 591. |
The electrons are produced by thermionic emission from a tungsten filament heated by |
| A. | 6 V supply |
| B. | 10 V supply |
| C. | 20 V supply |
| D. | 8 V supply |
| Answer» B. 10 V supply | |
| 592. |
J.J Thomson in 1897 observed the deflection of cathode rays by |
| A. | electric field |
| B. | magnetic field |
| C. | chemical field |
| D. | electric and magnetic field |
| Answer» E. | |
| 593. |
Radio, televisions and telephones process |
| A. | no signals |
| B. | digital signals |
| C. | analogue signals |
| D. | none of above |
| Answer» D. none of above | |
| 594. |
The inability of the eye to see the image of the objects is called |
| A. | defect of vision |
| B. | near point |
| C. | far point |
| D. | accommodation |
| Answer» B. near point | |
| 595. |
An endoscope is used to explore the |
| A. | Inner organs of human body |
| B. | skin |
| C. | tissues of human body |
| D. | exocrine glands |
| Answer» B. skin | |
| 596. |
A telescope can make stars look |
| A. | bigger |
| B. | brighter |
| C. | smaller |
| D. | all of above |
| Answer» C. smaller | |
| 597. |
The ability to distinguish between two closely placed objects or point sources is called an instrument's |
| A. | reflecting power |
| B. | resolving power |
| C. | optical power |
| D. | acoustical power |
| Answer» C. optical power | |
| 598. |
A magnifying glass is a lens that forms a virtual image that is |
| A. | smaller than the object |
| B. | equal to the object |
| C. | larger than the object |
| D. | none of above |
| Answer» D. none of above | |
| 599. |
In photograph enlarger, the object is placed |
| A. | between F and 2F |
| B. | beyond 2F |
| C. | at F |
| D. | less than F |
| Answer» B. beyond 2F | |
| 600. |
Pole is also termed as |
| A. | center of curvature |
| B. | focal length |
| C. | principal axis |
| D. | vertex |
| Answer» E. | |