MCQOPTIONS
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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.
| 351. |
If a body is moving in a straight line then net force acting on it is |
| A. | constant |
| B. | increasing |
| C. | decreasing |
| D. | zero |
| Answer» E. | |
| 352. |
As compare to sliding friction, the rolling friction is |
| A. | lesser |
| B. | greater |
| C. | equal |
| D. | always negative |
| Answer» B. greater | |
| 353. |
The resultant of all the forces acting on body is |
| A. | net force |
| B. | normal force |
| C. | perpendicular force |
| D. | equilibrium |
| Answer» B. normal force | |
| 354. |
With the gain of altitude, the value of g |
| A. | increases |
| B. | remains same |
| C. | decreases |
| D. | all of above |
| Answer» D. all of above | |
| 355. |
The weight of an object if the value of g on moon is 1.6 ms-2 having mass equals 100 kg is |
| A. | 100 N |
| B. | 160 N |
| C. | 1000 N |
| D. | 1600 N |
| Answer» C. 1000 N | |
| 356. |
If the mass of the Earth is 6 × 1024, radius is 6400 km and altitude is 1000 km, then the value of ‘g’ will be |
| A. | 8 ms-2 |
| B. | 7.3 ms-2 |
| C. | 9.5 ms-2 |
| D. | 8.9 ms-2 |
| Answer» C. 9.5 ms-2 | |
| 357. |
The velocity of geostationary satellite with respect to Earth is |
| A. | half |
| B. | triple |
| C. | zero |
| D. | double |
| Answer» D. double | |
| 358. |
The action and reaction due to force of gravitation are equal in magnitude but opposite in |
| A. | size |
| B. | direction |
| C. | volume |
| D. | none of above |
| Answer» C. volume | |
| 359. |
During interconversion of energy the total energy |
| A. | remains constant |
| B. | increases |
| C. | decreases |
| D. | becomes zero |
| Answer» B. increases | |
| 360. |
The efficiency of a solar cell is |
| A. | 0.8 |
| B. | 0.35 |
| C. | 0.55 |
| D. | 0.03 |
| Answer» E. | |
| 361. |
The value of the speed of light is |
| A. | 3 × 105 ms-1 |
| B. | 5 × 105 ms-1 |
| C. | 3 × 109 ms-1 |
| D. | 3 × 108 ms-1 |
| Answer» E. | |
| 362. |
The vibrating diaphragm of a drum in the form of |
| A. | kinetic energy |
| B. | sound energy |
| C. | chemical energy |
| D. | nuclear energy |
| Answer» C. chemical energy | |
| 363. |
If the kinetic energy of a body of mass 2 kg is 25 J. Its speed is |
| A. | 25 ms-1 |
| B. | 15 ms-1 |
| C. | 5 ms-1 |
| D. | 2.5 ms-1 |
| Answer» D. 2.5 ms-1 | |
| 364. |
Eagles fly without flapping their wings due to |
| A. | air currents |
| B. | sun radiation |
| C. | thermal climbing |
| D. | none of above |
| Answer» D. none of above | |
| 365. |
The heat flow rate depends on |
| A. | cross sectional area of solid |
| B. | length of solid |
| C. | temperature difference between ends |
| D. | all of above |
| Answer» E. | |
| 366. |
If the cross sectional area is larger, the rate of flow of heat will be |
| A. | zero |
| B. | constant |
| C. | smaller |
| D. | greater |
| Answer» E. | |
| 367. |
Thermal conductivity of air is |
| A. | 0.026 Wm-1 K-1 |
| B. | 0.75 Wm-1 K-1 |
| C. | 0.59 Wm-1 K-1 |
| D. | 1.58 Wm-1 K-1 |
| Answer» B. 0.75 Wm-1 K-1 | |
| 368. |
The surface which absorbs more heat is |
| A. | black and rough |
| B. | white and rough |
| C. | red and rough |
| D. | pink and rough |
| Answer» B. white and rough | |
| 369. |
On the Fahrenheit scale, the upper fixed point is marked as |
| A. | 32 °F |
| B. | 212 °F |
| C. | 100 °F |
| D. | 0 °F |
| Answer» C. 100 °F | |
| 370. |
The fraction change in the volume per kelvin change in temperature is equal to |
| A. | coefficient of linear thermal expansion |
| B. | temperature coefficient of volume expansion |
| C. | pressure expansion |
| D. | coefficient of contraction |
| Answer» C. pressure expansion | |
| 371. |
More molecules of a liquid move with high velocities at |
| A. | pressure |
| B. | zero temperature |
| C. | lower temperature |
| D. | higher temperature |
| Answer» E. | |
| 372. |
Once heats enter a body, it becomes its |
| A. | constant energy |
| B. | negative energy |
| C. | external energy |
| D. | internal energy |
| Answer» E. | |
| 373. |
On the Fahrenheit scale, the interval between the lower and upper fixed points is divided into |
| A. | 100 equal parts |
| B. | 180 equal parts |
| C. | 50 equal parts |
| D. | 90 equal parts |
| Answer» C. 50 equal parts | |
| 374. |
In the process of rubbing hands, mechanical energy is converted into |
| A. | sound energy |
| B. | electrical energy |
| C. | thermal energy |
| D. | heat energy |
| Answer» E. | |
| 375. |
If some energy given to a system, then energy in the required form obtained is always |
| A. | less than the given energy |
| B. | equal to the given energy |
| C. | greater than the given energy |
| D. | none of above |
| Answer» B. equal to the given energy | |
| 376. |
The relation between mass ‘m’, speed of light ‘c’ and energy ‘E’ can be written as |
| A. | E = m + c |
| B. | E = m - c |
| C. | E = m c² |
| D. | E = m c |
| Answer» D. E = m c | |
| 377. |
The capacity of a body to do work is called |
| A. | energy |
| B. | work load |
| C. | kinetic energy |
| D. | potential energy |
| Answer» B. work load | |
| 378. |
If a stone of mass 500 g strikes the ground with velocity of 20 ms-1 then kinetic energy at that point is |
| A. | 10 J |
| B. | 40 J |
| C. | 75 J |
| D. | 100 J |
| Answer» E. | |
| 379. |
The most suitable state for thermometric material is |
| A. | solid |
| B. | plasma |
| C. | liquid |
| D. | gas |
| Answer» D. gas | |
| 380. |
The absolute zero is equal to |
| A. | -273 °C |
| B. | -280 °C |
| C. | 0 °C |
| D. | -100 °C |
| Answer» B. -280 °C | |
| 381. |
Mercury boils at |
| A. | 357 °C |
| B. | 375 °C |
| C. | 350 °C |
| D. | 367 °C |
| Answer» C. 350 °C | |
| 382. |
The changing of liquid into vapors without heating is called |
| A. | freezing |
| B. | steaming |
| C. | evaporation |
| D. | melting |
| Answer» D. melting | |
| 383. |
The liquid which evaporates more quickly is |
| A. | spirit |
| B. | water |
| C. | grease |
| D. | oil |
| Answer» B. water | |
| 384. |
Zeros between significant digits are also |
| A. | imaginary |
| B. | significant |
| C. | non-significant |
| D. | none of above |
| Answer» C. non-significant | |
| 385. |
The least count of ruler is |
| A. | 2 mm |
| B. | 10 mm |
| C. | 50 mm |
| D. | 1 mm |
| Answer» E. | |
| 386. |
Distance of the moon from the earth is |
| A. | 3.84 × 103 m |
| B. | 38.4 × 103 m |
| C. | 3.84 × 108 m |
| D. | 38.4 × 108 m |
| Answer» D. 38.4 × 108 m | |
| 387. |
The least count of the screw gauge is |
| A. | 1 mm |
| B. | 0.5 mm |
| C. | 0.01 mm |
| D. | 0.001 mm |
| Answer» D. 0.001 mm | |
| 388. |
To measure the volume of a liquid, powdered substance or irregular shaped insoluble solid we can use |
| A. | measuring cylinder |
| B. | screw gauge |
| C. | Vernier calipers |
| D. | physical balance |
| Answer» B. screw gauge | |
| 389. |
If the distance between all pairs of particles of the body do not change by applying a force then the body is said to be |
| A. | flexible |
| B. | small |
| C. | large |
| D. | rigid |
| Answer» E. | |
| 390. |
The steering of a car has a radius of 15 cm. The torque produced by a couple of 40 N will be |
| A. | 12 Nm |
| B. | 10.8 Nm |
| C. | 15 Nm |
| D. | 12.59 Nm |
| Answer» B. 10.8 Nm | |
| 391. |
Forces that are parallel to each other with the same direction are |
| A. | parallel forces |
| B. | like parallel forces |
| C. | unlike parallel forces |
| D. | none of above |
| Answer» C. unlike parallel forces | |
| 392. |
If the force ‘F’ is multiplied by arm ‘L’, we get |
| A. | momentum |
| B. | distance |
| C. | torque/moment |
| D. | inertia |
| Answer» D. inertia | |
| 393. |
A man is pulling a trolley on a horizontal road with a force of 100 N making 45 ° with the road. The horizontal and vertical components will be |
| A. | 52.5 N, 85.09 N |
| B. | 55.6 N, 78.6 N |
| C. | 60.3 N, 54.11 N |
| D. | 70 N, 29.23 N |
| Answer» B. 55.6 N, 78.6 N | |
| 394. |
A car start from rest. It moves through 2 km in 100 s with uniform acceleration. Its speed at the end of 100 s will be |
| A. | 80 −1 |
| B. | 20 −1 |
| C. | 40 ms−1 |
| D. | 10 −1 |
| Answer» D. 10 −1 | |
| 395. |
The velocity of ball at highest point when its thrown vertically upward is |
| A. | -10 ms-1 |
| B. | 10 ms-2 |
| C. | 8 ms-1 |
| D. | zero |
| Answer» E. | |
| 396. |
The quantities between which graph is plotted is called |
| A. | scalars |
| B. | vectors |
| C. | variables |
| D. | base |
| Answer» D. base | |
| 397. |
A bus starts from rest. Its velocity becomes 30 ms−1 in 8s. Its acceleration will be |
| A. | 3 ms−2 |
| B. | 5 ms−2 |
| C. | 2 ms−2 |
| D. | 3.5 ms−2 |
| Answer» B. 5 ms−2 | |
| 398. |
The velocity of cyclist when he completes half round of a circular track of radius 318 m in 1.5 min is |
| A. | 10 ms-1 |
| B. | 8 ms-1 |
| C. | 7.07 ms-1 |
| D. | 9 ms-1 |
| Answer» D. 9 ms-1 | |
| 399. |
A point where the whole weight of the body appears to act vertically downward is called |
| A. | intersection point |
| B. | center of a mass |
| C. | friction |
| D. | center of gravity |
| Answer» E. | |
| 400. |
The turning effect of a force is called the force's |
| A. | momentum |
| B. | distance |
| C. | torque/moment |
| D. | inertia |
| Answer» D. inertia | |