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MCQOPTIONS
This section includes 760 Mcqs, each offering curated multiple-choice questions to sharpen your Grade9 knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
The changing of a liquid into vapors from the surface of the liquid without heating it is called |
| A. | expansion |
| B. | contraction |
| C. | evaporation |
| D. | fusion |
| Answer» D. fusion | |
| 552. |
Thermal volume expansion of liquid has |
| A. | 3 types |
| B. | 2 types |
| C. | 4 types |
| D. | 5 types |
| Answer» C. 4 types | |
| 553. |
Wires on electric poles are given some sag to prevent breaking in |
| A. | winter |
| B. | rainy season |
| C. | hot season |
| D. | wind |
| Answer» B. rainy season | |
| 554. |
If the temperature on the Celsius scale is 20 °C the temperature in kelvin scale is |
| A. | 294 K |
| B. | 293 K |
| C. | 292 K |
| D. | 300 K |
| Answer» C. 292 K | |
| 555. |
A device that is used to measure the temperature of a body is called |
| A. | thermometer |
| B. | barometer |
| C. | nanometer |
| D. | beam balance |
| Answer» B. barometer | |
| 556. |
Normal human body's temperature is 98.6 °F. In kelvin scale, it is |
| A. | 320 K |
| B. | 300 K |
| C. | 308 K |
| D. | 310 K |
| Answer» E. | |
| 557. |
Evaporation causes |
| A. | cooling |
| B. | heating effect |
| C. | increase in weight |
| D. | increase in density |
| Answer» B. heating effect | |
| 558. |
Water from 4 °C to 0 °C |
| A. | contracts |
| B. | starts to turn in to ice |
| C. | expands |
| D. | none of above |
| Answer» D. none of above | |
| 559. |
The scale on a thermometer has |
| A. | 3 fixed points |
| B. | 4 fixed points |
| C. | 1 fixed point |
| D. | 2 fixed points |
| Answer» E. | |
| 560. |
To and fro motion of a body about its mean position is termed as |
| A. | random motion |
| B. | vibratory motion |
| C. | circular motion |
| D. | rotatory motion |
| Answer» C. circular motion | |
| 561. |
The acceleration of freely falling bodies is known as |
| A. | Galileo acceleration |
| B. | zero acceleration |
| C. | graphical acceleration |
| D. | gravitational acceleration |
| Answer» E. | |
| 562. |
The numerical value with an appropriate unit is called |
| A. | rate |
| B. | magnitude of quantity |
| C. | amount |
| D. | position |
| Answer» C. amount | |
| 563. |
A physical quantity which can be completely described by its magnitude and direction is called |
| A. | scalar |
| B. | vector |
| C. | displacement |
| D. | velocity |
| Answer» C. displacement | |
| 564. |
The quantity whose value varies with the independent quantity is termed as |
| A. | negative quantity |
| B. | dependent quantity |
| C. | fixed quantity |
| D. | zero quantity |
| Answer» C. fixed quantity | |
| 565. |
The SI unit of power is |
| A. | joules |
| B. | newton |
| C. | watt |
| D. | omega |
| Answer» D. omega | |
| 566. |
The ratio of required form of energy obtained from a system as output to the total energy given to it as input is called its |
| A. | efficiency |
| B. | power |
| C. | stress |
| D. | strain |
| Answer» B. power | |
| 567. |
Kinetic energy with mass ‘m’ and velocity ‘v’ is |
| A. | 2 mv² |
| B. | 1/2 mv |
| C. | 2m ⁄ v² |
| D. | 1/2 mv² |
| Answer» E. | |
| 568. |
The main source of heat is |
| A. | moon |
| B. | stars |
| C. | sun |
| D. | Mars |
| Answer» D. Mars | |
| 569. |
A system which gives an output equal to the total energy used by it is called |
| A. | negative system |
| B. | non-ideal system |
| C. | ideal system |
| D. | slow system |
| Answer» D. slow system | |
| 570. |
Earth's gravitational force of attraction vanishes at |
| A. | 6400 km |
| B. | infinity |
| C. | 6900 km |
| D. | 10000 km |
| Answer» C. 6900 km | |
| 571. |
The value of ‘g’ is inversely proportional to the square of the Earth's |
| A. | diameter |
| B. | radius |
| C. | weight |
| D. | area |
| Answer» C. weight | |
| 572. |
The weight of body is due to force of gravitation between body and |
| A. | earth |
| B. | other bodies |
| C. | atmosphere |
| D. | water |
| Answer» B. other bodies | |
| 573. |
To move around the Earth, a satellite requires |
| A. | centrifugal force |
| B. | centripetal force |
| C. | dynamic force |
| D. | translatory force |
| Answer» C. dynamic force | |
| 574. |
The mass of earth is |
| A. | 5 * 1024 kg |
| B. | 6 * 1024 |
| C. | 7 * 1024 |
| D. | 8 * 1024 |
| Answer» C. 7 * 1024 | |
| 575. |
When a body is lifted through a height h, the work done on it appears in the form of its |
| A. | kinetic energy |
| B. | potential energy |
| C. | chemical energy |
| D. | geothermal energy |
| Answer» C. chemical energy | |
| 576. |
The interconversion of matter and energy is predicted by |
| A. | Newton |
| B. | Einstein |
| C. | Jobst Burgi |
| D. | Abu Jafar |
| Answer» C. Jobst Burgi | |
| 577. |
The change in the quality of the environment that can be harmful to living things is called |
| A. | power |
| B. | energy conversion |
| C. | pollution |
| D. | none of above |
| Answer» D. none of above | |
| 578. |
Anna carries a 12 kg bag upstairs to a height of 15 steps. The amount of work she has done is |
| A. | 360 J |
| B. | 270 J |
| C. | 250 J |
| D. | 290 J |
| Answer» C. 250 J | |
| 579. |
The energy obtained from electric cells and batteries as a result of a chemical reaction is called |
| A. | chemical energy |
| B. | nuclear energy |
| C. | heat energy |
| D. | electrical energy |
| Answer» E. | |
| 580. |
As compared to non-metals, heat reaches from the hot part to the cold parts of the metal objects |
| A. | slowly |
| B. | quickly |
| C. | equal time |
| D. | none of above |
| Answer» C. equal time | |
| 581. |
Central heating system in buildings work on the principle of |
| A. | convection |
| B. | fusion |
| C. | radiation |
| D. | conduction |
| Answer» B. fusion | |
| 582. |
The process in which heat is transferred in form of waves is called |
| A. | Conduction |
| B. | convection |
| C. | thermal climbing |
| D. | radiation |
| Answer» E. | |
| 583. |
The good conductors of heat is |
| A. | water |
| B. | wool |
| C. | rubber |
| D. | metal |
| Answer» E. | |
| 584. |
Central heating systems in buildings work on the principle of |
| A. | convection |
| B. | radiation |
| C. | conduction |
| D. | all of above |
| Answer» B. radiation | |
| 585. |
A body is in equilibrium if it moves with |
| A. | uniform velocity |
| B. | constant velocity |
| C. | uniform acceleration |
| D. | constant acceleration |
| Answer» B. constant velocity | |
| 586. |
Splitting up of a force into two mutually perpendicular components is called the |
| A. | determination of that force |
| B. | subtraction of the forces |
| C. | resolution of that force |
| D. | line of action of that force |
| Answer» D. line of action of that force | |
| 587. |
A boy tightens the nut of a car using a 16 cm long spanner by applying a force of 180 N. The torque will be |
| A. | 2880 N m |
| B. | 28.8 N m |
| C. | 30 N m |
| D. | 11.25 N m |
| Answer» C. 30 N m | |
| 588. |
The body is in equilibrium if sum of all the |
| A. | forces acting on it is zero only |
| B. | torque acting on it is zero only |
| C. | momentum acting on it zero |
| D. | forces and acting on it is zero |
| Answer» E. | |
| 589. |
A paratrooper coming down with terminal velocity is |
| A. | accelerating |
| B. | decelerating |
| C. | not in equilibrium |
| D. | in equilibrium |
| Answer» E. | |
| 590. |
The temperature at which a substance changes from liquid to solid is called its |
| A. | constant point |
| B. | boiling point |
| C. | freezing point |
| D. | melting point |
| Answer» D. melting point | |
| 591. |
Ice changes into water at |
| A. | 100 °C |
| B. | 0 °C |
| C. | 132 °C |
| D. | 32 °C |
| Answer» C. 132 °C | |
| 592. |
Normal human body's temperature is |
| A. | 30 °C |
| B. | 37 °C |
| C. | 42 °C |
| D. | 32 °C |
| Answer» C. 42 °C | |
| 593. |
At high temperature, the evaporation is |
| A. | fast |
| B. | low |
| C. | decreasing |
| D. | zero |
| Answer» B. low | |
| 594. |
Latent heat of fusion of ice is |
| A. | 4.36 × 105 Jkg-1 |
| B. | 2.36 × 105 Jkg-1 |
| C. | 1.36 × 105 Jkg-1 |
| D. | 3.36 × 105 Jkg-1 |
| Answer» E. | |
| 595. |
Mass per unit volume is called |
| A. | resistance |
| B. | volume |
| C. | density |
| D. | weight |
| Answer» D. weight | |
| 596. |
SI unit of density is |
| A. | kgm-4 |
| B. | kgm-3 |
| C. | kgm-2 |
| D. | kgm |
| Answer» C. kgm-2 | |
| 597. |
Solids have fixed |
| A. | volume only |
| B. | shape only |
| C. | position |
| D. | volume and shape |
| Answer» E. | |
| 598. |
A comparison of such a change caused by the stress with the original shape, volume or length is called |
| A. | stress |
| B. | strain |
| C. | density |
| D. | elasticity |
| Answer» C. density | |
| 599. |
Gases are much lighter than |
| A. | solids only |
| B. | liquids only |
| C. | gas |
| D. | solids and liquids |
| Answer» E. | |
| 600. |
On Kelvin scale, the lower fixed point is marked as |
| A. | 0 K |
| B. | 180 K |
| C. | 373 K |
| D. | 273 K |
| Answer» E. | |