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MCQOPTIONS
This section includes 2268 Mcqs, each offering curated multiple-choice questions to sharpen your Grade7 knowledge and support exam preparation. Choose a topic below to get started.
| 651. |
The products which are helpful in harnessing solar energy, are |
| A. | solar furnaces |
| B. | solar heaters |
| C. | solar cells |
| D. | all of above |
| Answer» E. | |
| 652. |
The energy resources which would not run out are called |
| A. | renewable |
| B. | non renewable |
| C. | original |
| D. | escapable |
| Answer» B. non renewable | |
| 653. |
Burning of fossils fuel is leading environment towards |
| A. | pollution |
| B. | global warming |
| C. | climate change |
| D. | all of above |
| Answer» D. all of above | |
| 654. |
The floating devices which are connected to chain for generation of electricity are called |
| A. | salter gooses |
| B. | salter ducks |
| C. | salter mines |
| D. | salter seagulls |
| Answer» C. salter mines | |
| 655. |
To play and work, we get energy from |
| A. | food |
| B. | sunlight |
| C. | oxygen and water |
| D. | all of above |
| Answer» E. | |
| 656. |
John Dalton carried out his experiment about atom in |
| A. | 1908 |
| B. | 1808 |
| C. | 1708 |
| D. | 1608 |
| Answer» C. 1708 | |
| 657. |
The ionic chemical formula of 'chlorine' is |
| A. | Cl- |
| B. | Cl+ |
| C. | Cl- |
| D. | Cl+ |
| Answer» B. Cl+ | |
| 658. |
The valency of 'zinc' is |
| A. | 3 |
| B. | 5 |
| C. | 2 |
| D. | 7 |
| Answer» D. 7 | |
| 659. |
Large molecules such as polythene and polystyrene contains |
| A. | ionic bonding |
| B. | metallic bonding |
| C. | covalent bonding |
| D. | dative bonding |
| Answer» D. dative bonding | |
| 660. |
An atom is electrically |
| A. | negative |
| B. | positive |
| C. | neutral |
| D. | both positive and negative |
| Answer» D. both positive and negative | |
| 661. |
The normal value of decibel that our ears can detect is |
| A. | -20 |
| B. | 0 |
| C. | 20 |
| D. | 40 |
| Answer» C. 20 | |
| 662. |
Sound is created by our vocal cord due to |
| A. | air in lungs |
| B. | cilia in the throat |
| C. | vibration in throat |
| D. | vibration in lungs |
| Answer» D. vibration in lungs | |
| 663. |
Sounds of thunder and horn of lorries are known as |
| A. | loud sounds |
| B. | soft sounds |
| C. | high pitched sounds |
| D. | low pitched sounds |
| Answer» B. soft sounds | |
| 664. |
In large empty rooms, even a click keeps on |
| A. | increasing |
| B. | decreasing |
| C. | repeating |
| D. | coming |
| Answer» D. coming | |
| 665. |
Singing and talking are the |
| A. | artificial sounds |
| B. | natural sounds |
| C. | man-made sounds |
| D. | sounds made electronically |
| Answer» D. sounds made electronically | |
| 666. |
The organs of a human that detect sounds are |
| A. | eyes |
| B. | ears |
| C. | feet |
| D. | hands |
| Answer» C. feet | |
| 667. |
If frequency increases, |
| A. | wavelength also increases |
| B. | amplitude also increases |
| C. | number of waves also increases |
| D. | amplitude decreases |
| Answer» D. amplitude decreases | |
| 668. |
If frequency is high, the peak of the waves would be |
| A. | uneven |
| B. | closer |
| C. | distant |
| D. | even |
| Answer» C. distant | |
| 669. |
In one wavelength, wave passes through |
| A. | one complete vibration |
| B. | two complete vibrations |
| C. | one and a half vibration |
| D. | two and a half vibration |
| Answer» B. two complete vibrations | |
| 670. |
As compare to humans, bats can hear sounds only with |
| A. | low frequency |
| B. | low pitch |
| C. | low amplitude |
| D. | high pitch |
| Answer» E. | |
| 671. |
A fixed temperature on which liquid changes into gas is called its |
| A. | melting point |
| B. | boiling point |
| C. | freezing point |
| D. | evaporation |
| Answer» C. freezing point | |
| 672. |
On cooling gas is changed in to liquid by the process of |
| A. | condensation |
| B. | diffusion |
| C. | osmosis |
| D. | evaporation |
| Answer» B. diffusion | |
| 673. |
The physical properties of a solid depends upon discrete and |
| A. | arrangement of small particles |
| B. | freedom of motion of small particles |
| C. | freedom of motion of big particles |
| D. | both a and b |
| Answer» D. both a and b | |
| 674. |
The particles move far from each other and vibrate strongly breaking the attractive force among them upon |
| A. | melting |
| B. | boiling |
| C. | freezing |
| D. | solidifying |
| Answer» C. freezing | |
| 675. |
The particles model of matter states that tiny discrete particles |
| A. | compose a matter |
| B. | are in random movement |
| C. | complex |
| D. | both a and b |
| Answer» E. | |
| 676. |
Toxic air pollutants like sulphur dioxide and nitrogen oxides are produced by burning |
| A. | coal |
| B. | oil |
| C. | gases |
| D. | both a and b |
| Answer» E. | |
| 677. |
The need and demand of fossils fuel can be reduced by |
| A. | conserving energy |
| B. | storing energy |
| C. | utilizing energy |
| D. | transforming energy |
| Answer» B. storing energy | |
| 678. |
Atomic number of 'Zinc' is |
| A. | 10 |
| B. | 20 |
| C. | 30 |
| D. | 40 |
| Answer» D. 40 | |
| 679. |
Living things are source of |
| A. | fossils fuel |
| B. | bio mass |
| C. | both a and b |
| D. | coal |
| Answer» D. coal | |
| 680. |
Due to constant heat and pressure, buried plants turn in to |
| A. | wood |
| B. | coal |
| C. | fertilizer |
| D. | oil |
| Answer» C. fertilizer | |
| 681. |
The reactions of 'exothermic' are |
| A. | condensation reactions |
| B. | endothermic reactions |
| C. | reversible reactions |
| D. | substitution reactions |
| Answer» C. reversible reactions | |
| 682. |
Physical changes are |
| A. | reversible |
| B. | irreversible |
| C. | permanent |
| D. | temporary |
| Answer» B. irreversible | |
| 683. |
Plastic industry was started when a chemist made a |
| A. | black coating of plastic |
| B. | bakelite |
| C. | solid kerosene plastic |
| D. | plastic with cellulose |
| Answer» C. solid kerosene plastic | |
| 684. |
A change of state from one form to other is a |
| A. | physical change |
| B. | chemical change |
| C. | biological change |
| D. | state variation |
| Answer» B. chemical change | |
| 685. |
A substance which is burned to produce heat and light is known as |
| A. | fuel |
| B. | alcohol |
| C. | acid |
| D. | alkane |
| Answer» B. alcohol | |
| 686. |
An imaginary line going through the center of earth from the north pole to the south pole about which the earth rotates is called |
| A. | rotation |
| B. | revolution |
| C. | tilt |
| D. | axis |
| Answer» E. | |
| 687. |
The images which terrestrial telescope capture are not |
| A. | distorted |
| B. | effected by pollution |
| C. | clear |
| D. | both a and b |
| Answer» E. | |
| 688. |
Non luminous objects do not emit |
| A. | heat |
| B. | light |
| C. | weight |
| D. | force |
| Answer» C. weight | |
| 689. |
The large reflecting telescope which is orbiting earth in outer space is called |
| A. | The Hubble space |
| B. | space probe |
| C. | sputnik-1 |
| D. | voyager-1 |
| Answer» B. space probe | |
| 690. |
Pluto was discontinued to be regarded as planet in 2006 due to its |
| A. | dwarf size |
| B. | unusual orbit |
| C. | rotation |
| D. | both a and b |
| Answer» D. both a and b | |
| 691. |
The carbon dioxide is removed from |
| A. | anus as feces |
| B. | lungs while inhaling |
| C. | lungs while exhaling |
| D. | kidneys |
| Answer» D. kidneys | |
| 692. |
Every single cell of the body requires |
| A. | oxygen only |
| B. | food only |
| C. | carbon dioxide and food |
| D. | oxygen and food |
| Answer» E. | |
| 693. |
The process of giving out breath is known as |
| A. | inhaling |
| B. | exhaling |
| C. | respiration |
| D. | evaporation |
| Answer» C. respiration | |
| 694. |
The number of viruses which an average sneeze can spread in 10 meters area, is |
| A. | 1000 |
| B. | 10000 |
| C. | 100000 |
| D. | 1000000 |
| Answer» D. 1000000 | |
| 695. |
Cold is caused by |
| A. | bacteria |
| B. | viruses |
| C. | insects |
| D. | dust |
| Answer» C. insects | |
| 696. |
The resistor whose resistivity can be varied manually is known as |
| A. | transistor |
| B. | thermistor |
| C. | variable resistor |
| D. | fixed resistor |
| Answer» D. fixed resistor | |
| 697. |
The main supply system has plugs with |
| A. | one pin |
| B. | two pins |
| C. | three pins |
| D. | four pins |
| Answer» D. four pins | |
| 698. |
One of the cause of short circuits is |
| A. | insulated wiring |
| B. | fixed resistance |
| C. | variable resistance |
| D. | faulty wire insulation |
| Answer» E. | |
| 699. |
ELCB is also switched off if |
| A. | faulty earth wire has been used |
| B. | faulty equipment has been used |
| C. | faulty switches have been used |
| D. | two pin plugs have been used |
| Answer» C. faulty switches have been used | |
| 700. |
An example of good electrical conductor is |
| A. | aluminum |
| B. | sodium |
| C. | potassium |
| D. | zinc |
| Answer» B. sodium | |