MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1777 Mcqs, each offering curated multiple-choice questions to sharpen your 9th Class knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
The given figure represents the oxygen cycle which maintains the level of oxygen in the atmosphere. Which of the following processes will you place at X and Y in the figure? |
| A. | X Y Combustion Respiration |
| B. | X Y Respiration Transpiration |
| C. | X Y Photosynthesis Evaporation |
| D. | X Y Photosynthesis Respiration |
| Answer» E. | |
| 402. |
Which one of the following statements is true? Statement 1: \[S{{O}_{2}}\] is a pollutant. Statement 2: \[S{{O}_{2}}\] reacts with water in the atmosphere to form sulphuric acid. |
| A. | Statement 1 |
| B. | Statement 2 |
| C. | Both statements are correct |
| D. | Both statements are incorrect |
| E. | None of these |
| Answer» D. Both statements are incorrect | |
| 403. |
Which of the following is an abiotic component of the environment? |
| A. | Plants |
| B. | Animals |
| C. | Microorganisms |
| D. | Water |
| E. | None of these |
| Answer» E. None of these | |
| 404. |
The phenomenon of increase in concentration of non-biodegradable organic compounds with each trophic level in a food chain is called |
| A. | Biological evolution |
| B. | Bioenlargement |
| C. | Biological fixation |
| D. | Biomagnification. |
| Answer» E. | |
| 405. |
Select the incorrect statement regarding the rainfall with low pH. |
| A. | It affects aquatic life and corrodes metal, stone, etc. |
| B. | It is caused by reaction of sulphur and nitrogen oxides with moisture in air. |
| C. | It is the consequence of increased use of non-conventional sources of energy. |
| D. | It affects plants also. |
| Answer» D. It affects plants also. | |
| 406. |
A car moving on a road with uniform acceleration covers \[20\,\,m\] in the first second and \[30\,\,m\] in the next second. What is its acceleration? |
| A. | \[20\,\,m\,\,{{s}^{-2}}\] |
| B. | \[10\,\,m\,\,{{s}^{-2}}\] |
| C. | \[30\,\,m\,\,{{s}^{-2}}\] |
| D. | \[5\,\,m\,\,{{s}^{-2}}\] |
| Answer» C. \[30\,\,m\,\,{{s}^{-2}}\] | |
| 407. |
In the velocity-time graph, AB shows that the body has |
| A. | Uniform acceleration |
| B. | Non-uniform retardation |
| C. | Uniform speed |
| D. | Initial velocity OA and is moving with uniform retardation |
| Answer» E. | |
| 408. |
Velocity of a body at rest is always |
| A. | Unity |
| B. | Negative |
| C. | Zero |
| D. | Infinite |
| Answer» D. Infinite | |
| 409. |
Physical quantity corresponding to the rate of change of displacement is |
| A. | Speed |
| B. | velocity |
| C. | Acceleration |
| D. | retardation |
| Answer» C. Acceleration | |
| 410. |
Ratio of the SI units to CGS units of retardation is |
| A. | \[\text{1}{{0}^{-\text{2}}}~~~~~~~~~~~~~~\] |
| B. | \[\text{1}{{0}^{\text{2}}}\] |
| C. | 10 |
| D. | \[\text{1}{{0}^{-\text{1}}}\] |
| Answer» C. 10 | |
| 411. |
If the time-displacement graph of a particle is parallel to the time-axis, then velocity of the particle is |
| A. | Infinity |
| B. | Unity |
| C. | Equal to acceleration of the body |
| D. | Zero |
| Answer» E. | |
| 412. |
The length of a minute hand of a clock is\[4\,\,cm\]. Find the displacement and the average velocity of the tip of the minute hand when it moves from 3.15 p.m. to 3.30 p.m. |
| A. | \[4\sqrt{2}cm,\,\,\frac{\sqrt{2}}{225}cm\,\,{{s}^{-1}}\] |
| B. | \[4\sqrt{2}cm,\,\,\frac{4}{225}cm\] |
| C. | \[2\sqrt{4}cm,\,\,\frac{1}{225}cm\,\,{{s}^{-1}}\] |
| D. | \[4\sqrt{2}cm,\,\,\frac{2}{225}cm\,\,{{s}^{-1}}\] |
| Answer» B. \[4\sqrt{2}cm,\,\,\frac{4}{225}cm\] | |
| 413. |
An aeroplane, when it is vertically above the point A on the ground, drops a bomb which hits target B on the ground. If the plane is moving at a height of 1.96 km from the ground with a speed of 300 m/sec, then distance between A and B is (neglecting air resistance) |
| A. | 3 km |
| B. | 6 km |
| C. | 3 m/s |
| D. | 4 m/s |
| Answer» C. 3 m/s | |
| 414. |
If the velocity of a body does not change, its acceleration is |
| A. | Zero |
| B. | infinite |
| C. | Unity |
| D. | none of these |
| Answer» B. infinite | |
| 415. |
Speed of a body describing its motion is |
| A. | Direction |
| B. | state |
| C. | Type |
| D. | rapidity |
| Answer» E. | |
| 416. |
A ball rolls off the top of a stair way with a horizontal velocity u m/s. If the steps are h metres high and b metres wide, then ball will hit the edge of the nth step, if |
| A. | \[n=\frac{2h{{u}^{2}}}{g{{b}^{2}}}\] |
| B. | \[n=\frac{2hu}{g{{b}^{2}}}\] |
| C. | \[n=\frac{2{{b}^{2}}}{2h{{u}^{2}}}\] |
| D. | \[n=\frac{g{{b}^{2}}}{2hu}\] |
| Answer» B. \[n=\frac{2hu}{g{{b}^{2}}}\] | |
| 417. |
Consider the given statements and select the option which correctly identifies the true (T) and false (F) statements.(i) Distance is the magnitude of displacement in all cases.(ii) When a body moves with uniform speed, then the average speed is same as instantaneous speed.(iii) Average speed is greater than the average velocity if a body is moving in a straight line without reversing its direction.(iv) When a body moves with constant velocity, the average velocity is zero. |
| A. | (i)(ii)(iii)(iv)TFTF |
| B. | (i)(ii)(iii)(iv)TTTT |
| C. | (i)(ii)(iii)(iv)FFFF |
| D. | (i)(ii)(iii)(iv)FTFF |
| Answer» E. | |
| 418. |
If the distance travelled by a body in the second is given by\[(4+6n)m\], then find the initial velocity and acceleration of the body respectively. |
| A. | \[3\,\,m\,\,{{s}^{-1}},\,\,6\,\,m\,\,{{s}^{-2}}\] |
| B. | \[7\,\,m\,\,{{s}^{-1}},\,\,4\,\,{{s}^{-2}}\] |
| C. | \[7\,\,m\,\,{{s}^{-1}},\,\,6\,\,m\,\,{{s}^{-2}}\] |
| D. | \[7\,\,m\,\,{{s}^{-1}},\,\,3\,\,m\,\,{{s}^{-2}}\] |
| Answer» D. \[7\,\,m\,\,{{s}^{-1}},\,\,3\,\,m\,\,{{s}^{-2}}\] | |
| 419. |
A ball of mass m is thrown vertically up. Another ball of mass 2m is thrown at an angle 9. Both of them stay in our view for the same period. The heights attained by the two are in the ratio |
| A. | 2 : 1 |
| B. | 1 : 1 |
| C. | 1 : cos \[\text{ }\!\!\theta\!\!\text{ }\] |
| D. | 1 : sec \[\text{ }\!\!\theta\!\!\text{ }\] |
| Answer» C. 1 : cos \[\text{ }\!\!\theta\!\!\text{ }\] | |
| 420. |
The relationship between average speed, time and distance is |
| A. | Average speed = distance x time |
| B. | \[\text{Average}\,\text{Speed=}\frac{\text{Total}\,\text{distance}}{\text{Total}\,\text{time}}\] |
| C. | Time = average speed/distance |
| D. | Distance = average speed x time |
| Answer» C. Time = average speed/distance | |
| 421. |
A cylist moves from a certain point X and goes round a circle radius, r and reaches Y, exactly at the other side of the point X, as shown in the given figure. (ii) The distance covered by the cyclist would be |
| A. | \[\pi r\] |
| B. | \[2\pi r\] |
| C. | 2r |
| D. | \[\frac{2\pi }{r}\] |
| Answer» B. \[2\pi r\] | |
| 422. |
A cylist moves from a certain point X and goes round a circle radius, r and reaches Y, exactly at the other side of the point X, as shown in the given figure. (i) The displacement of the cylist would be |
| A. | \[\pi r\] |
| B. | \[2\pi r\] |
| C. | \[2r\] |
| D. | \[\frac{2\pi }{r}\] |
| Answer» D. \[\frac{2\pi }{r}\] | |
| 423. |
A vehicle is moving with a velocity u on a curved road of width b and radius of curvature R. For counteracting the centrifugal force on the vehicle, the difference in elevation required in between the outer and inner edges of the road is |
| A. | \[\frac{{{v}^{2}}b}{Rg}\] |
| B. | \[\frac{vb}{Rg}\] |
| C. | \[\frac{v{{b}^{2}}}{Rg}\] |
| D. | \[\frac{vb}{{{R}^{2}}g}\] |
| Answer» B. \[\frac{vb}{Rg}\] | |
| 424. |
A phonograph record on turn table rotates at 30 rpm. The linear speed of a point on the record at the needle at the beginning of the recording when it is at a distance of 14 cm from the centre is |
| A. | 22 cm/ sec |
| B. | 44 cm/sec |
| C. | 48 cm/sec |
| D. | 52 cm/sec |
| Answer» C. 48 cm/sec | |
| 425. |
Unit for the rate of change of velocity is |
| A. | m/s |
| B. | \[\text{m}/{{\text{s}}^{\text{2}}}\] |
| C. | N s |
| D. | N / s |
| Answer» C. N s | |
| 426. |
Figure shows the x-t plot of a particle in one-dimensional motion. Two different equal intervals of time are shown. \[Let\,\,{{v}_{1}}\]and \[{{v}_{2}}\] be average speeds in time intervals 1 and 2 respectively. Then |
| A. | \[{{v}_{1}}>{{v}_{2}}\] |
| B. | \[{{v}_{2}}>{{v}_{1}}\] |
| C. | \[{{v}_{1}}={{v}_{2}}\] |
| D. | Data is insufficient |
| Answer» B. \[{{v}_{2}}>{{v}_{1}}\] | |
| 427. |
The rate of change of displacement with time is |
| A. | Speed |
| B. | acceleration |
| C. | Retardation |
| D. | velocity |
| Answer» E. | |
| 428. |
An insect moves along a circular path of radius \[10\,\,cm\] with a constant speed. If it takes \[1\] minute to move from a point on the path to the diametrically opposite point, then what is the distance it travels and average velocity of the insect respectively? |
| A. | \[3.14\,\,cm{{(\min )}^{-1}},\,\,20\,\,cm{{(\min )}^{-1}}\] |
| B. | \[31.4\,\,cm{{(\min )}^{-1}},\,\,0.33\,\,cm\,\,{{s}^{-1}}\] |
| C. | \[0.314\,\,cm{{(\min )}^{-1}},\,\,1\,\,cm{{(\min )}^{-1}}\] |
| D. | \[314\,\,cm{{(\min )}^{-1}},\,\,0.1\,\,cm{{(\min )}^{-1}}\] |
| Answer» C. \[0.314\,\,cm{{(\min )}^{-1}},\,\,1\,\,cm{{(\min )}^{-1}}\] | |
| 429. |
A cane filled with water is revolved in a vertical circle of radius 4 m and the water just does not fall down. The time period of revolution will be |
| A. | 1 sec |
| B. | 10 sec |
| C. | 8 sec |
| D. | 4 sec |
| Answer» E. | |
| 430. |
A motor car is travelling 30 m/s on a circular road of radius 500 m. It is increasing in speed at the rate of 2\[\text{m}/{{\text{s}}^{\text{2}}}\]. What is its acceleration? |
| A. | \[\text{3}.0\text{ m}/{{\text{s}}^{\text{2}}}\] |
| B. | \[\text{2}.\text{7 m}/{{\text{s}}^{\text{2}}}\] |
| C. | \[\text{1}.\text{8 m}/{{\text{s}}^{\text{2}}}\] |
| D. | \[\text{2}.\text{5 m}/{{\text{s}}^{\text{2}}}\] |
| Answer» C. \[\text{1}.\text{8 m}/{{\text{s}}^{\text{2}}}\] | |
| 431. |
A person with a mass of M kg, stands in contact against the wall of a cylindrical drum of radius r rotating with an angular velocity co. If the coefficient of friction between the wall and the clothing is then minimum rotational speed of the cylinder which enables the person to remain stuck to the wall when the floor is suddenly removed is |
| A. | \[{{\omega }_{\min }}=\sqrt{\frac{g}{\mu r}}\] |
| B. | \[{{\omega }_{\min }}=\sqrt{\frac{\mu r}{g}}\] |
| C. | \[{{\omega }_{\min }}=\sqrt{\frac{2g}{\mu r}}\] |
| D. | \[{{\omega }_{\min }}=\sqrt{\frac{gr}{\mu }}\] |
| Answer» B. \[{{\omega }_{\min }}=\sqrt{\frac{\mu r}{g}}\] | |
| 432. |
The acceleration of a point on the rim of flywheel 1 m in diameter, if it makes 1200 revolutions per minute is |
| A. | \[\text{87}{{\pi }^{\text{2}}}\text{ m}/{{\text{s}}^{\text{2}}}\] |
| B. | \[\text{8}0\text{ }{{\pi }^{\text{2}}}\text{ m}/{{\text{s}}^{\text{2}}}\] |
| C. | \[\text{8}00\text{ }{{\pi }^{\text{2}}}\text{ m}/{{\text{s}}^{\text{2}}}\] |
| D. | none of these |
| Answer» D. none of these | |
| 433. |
A body moving along a circular path has |
| A. | a constant speed |
| B. | A constant velocity |
| C. | No tangential velocity |
| D. | No radial acceleration |
| Answer» B. A constant velocity | |
| 434. |
In the previous question, the velocity |
| A. | Increases between point 0 and A |
| B. | Increases between point A and B |
| C. | Decre ases between points A and B |
| D. | Is zero through out |
| Answer» C. Decre ases between points A and B | |
| 435. |
The earth's radius is 6400 km. It makes one revolution about its own axis in 24 hrs. The centripetal acceleration of a point on its equator is nearly |
| A. | \[\text{34}0\text{ cm}/{{\text{s}}^{\text{2}}}\] |
| B. | \[\text{34 cm}/{{\text{s}}^{\text{2}}}\] |
| C. | \[\text{3}.\text{4 cm}/{{\text{s}}^{\text{2}}}\] |
| D. | \[0.\text{34 cm}/{{\text{s}}^{\text{2}}}\] |
| Answer» D. \[0.\text{34 cm}/{{\text{s}}^{\text{2}}}\] | |
| 436. |
A car of mass 1000 kg moves on a circular track of radius 20 m. If the coefficient of friction is 0.64, then what is the maximum velocity with which the car can be moved? |
| A. | 112 m/s |
| B. | 11.2 m/s |
| C. | \[\frac{0.64\times 20}{1000}m/s\] |
| D. | \[\frac{1000}{0.64\times 20}m/s\] |
| Answer» C. \[\frac{0.64\times 20}{1000}m/s\] | |
| 437. |
Direction: Read the passage carefully and answer the following questions. A dancer is demonstrating dance steps along a straight line. The position-time graph of the dancer is given here. The average velocity of the dancer during time interval between t = 2 s to t = 9 s is |
| A. | \[1\text{ }m\text{ }{{s}^{-1}}\] |
| B. | \[-\text{ }0.57\text{ }m\text{ }{{s}^{-1}}\] |
| C. | \[2.75\text{ }m\text{ }{{s}^{-1}}\] |
| D. | \[-\text{ }0.29\text{ }m\text{ }{{s}^{-1}}\] |
| Answer» E. | |
| 438. |
Distance travelled by a freely falling body is proportional to |
| A. | Mass of the body |
| B. | Square of the acceleration due to gravity |
| C. | Square of the time of fall |
| D. | Time of fall |
| Answer» D. Time of fall | |
| 439. |
The coordinates of moving particle at any time t are given by\[x=a{{t}^{2}}\] and\[\text{y }=\text{ b}{{\text{t}}^{\text{2}}}\]. The speed of the particle is |
| A. | \[2t(a+b)\] |
| B. | \[2t\sqrt{{{a}^{2}}+{{b}^{2}}}\] |
| C. | \[2t\left( \sqrt{{{a}^{2}}-{{b}^{2}}} \right)-2t\left( \sqrt{{{a}^{2}}-{{b}^{2}}} \right)\] |
| D. | \[\sqrt{{{a}^{2}}+{{b}^{2}}}\] |
| Answer» C. \[2t\left( \sqrt{{{a}^{2}}-{{b}^{2}}} \right)-2t\left( \sqrt{{{a}^{2}}-{{b}^{2}}} \right)\] | |
| 440. |
A stone tied to a string is whirled in a circle, and while it is revolving, the rope suddenly breaks. Then the stone |
| A. | Flies off tangentially |
| B. | Moves radially inward |
| C. | Moves radially outward |
| D. | None of these |
| Answer» B. Moves radially inward | |
| 441. |
Acceleration of a body projected upwards with a certain velocity is |
| A. | \[\text{9}.\text{8 m}/{{\text{s}}^{\text{2}}}\] |
| B. | \[-\text{ 9}.\text{8 m}/{{\text{s}}^{\text{2}}}\] |
| C. | Zero |
| D. | Insufficient data |
| Answer» C. Zero | |
| 442. |
If a ball is thrown up with a certain velocity. It attains a height of 40 m and comes back to the thrower, then |
| A. | Total distance covered by it is 40 m |
| B. | Total displacement covered by it is 80 m |
| C. | Total displacement is zero |
| D. | Total distance covered by it is zero |
| Answer» D. Total distance covered by it is zero | |
| 443. |
SI unit of the angular velocity is |
| A. | m/s |
| B. | rad |
| C. | rad /s |
| D. | m/rad |
| Answer» D. m/rad | |
| 444. |
SI unit of the resultant velocity is |
| A. | m/s |
| B. | km/s |
| C. | cm/s |
| D. | none of these |
| Answer» B. km/s | |
| 445. |
SI unit for the average velocity is |
| A. | m/s |
| B. | km/s |
| C. | cm/s |
| D. | none of these |
| Answer» B. km/s | |
| 446. |
A stone is thrown vertically upward with an initial velocity u from the top of a tower, reaches the ground with a velocity 3u. The height of the tower |
| A. | \[\frac{3{{u}^{2}}}{g}\] |
| B. | \[\frac{4{{u}^{2}}}{g}\] |
| C. | \[\frac{6{{u}^{2}}}{g}\] |
| D. | \[\frac{9{{u}^{2}}}{g}\] |
| Answer» C. \[\frac{6{{u}^{2}}}{g}\] | |
| 447. |
The distance versus time graph of a particle moving is shown below. What does the graph indicate? |
| A. | The particle starts with certain velocity with retardation and finally comes to rest. |
| B. | The velocity of the particle is constant. |
| C. | The acceleration of the particle is non-uniform throughout. |
| D. | The particle starts with a certain velocity and finally becomes uniform after certain time. |
| Answer» D. The particle starts with a certain velocity and finally becomes uniform after certain time. | |
| 448. |
Direction: Read the passage carefully and answer the following questions. A dancer is demonstrating dance steps along a straight line. The position-time graph of the dancer is given here. The average speed for the dance step depicted by CD is |
| A. | \[1\text{ }m\text{ }{{s}^{-1}}\] |
| B. | \[1.33\text{ }m{{\text{ }}^{s-1}}\] |
| C. | \[\text{2}\text{.75 m }{{\text{s}}^{\text{-1}}}\] |
| D. | \[\text{0}\text{.89 m }{{\text{s}}^{\text{-1}}}\] |
| Answer» D. \[\text{0}\text{.89 m }{{\text{s}}^{\text{-1}}}\] | |
| 449. |
Velocity-time graph of a body with uniform velocity is a straight line |
| A. | Parallel to x-axis |
| B. | Parallel to 3/-axis |
| C. | Inclined to x-axis |
| D. | Inclined to y-axis |
| Answer» B. Parallel to 3/-axis | |
| 450. |
A car covers \[30\,\,km\] at a uniform speed of\[60\,\,km\,\,{{h}^{-1}}\] and the next 30 km at a uniform speed of\[40\,\,km\,\,{{h}^{-1}}\]. Find the total time taken. |
| A. | \[30\,\,\min \] |
| B. | \[45\,\,\min \] |
| C. | \[75\,\,\min \] |
| D. | \[120\,\,\min \] |
| Answer» D. \[120\,\,\min \] | |