MCQOPTIONS
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MCQOPTIONS
This section includes 1489 Mcqs, each offering curated multiple-choice questions to sharpen your 8th Class knowledge and support exam preparation. Choose a topic below to get started.
| 601. |
The second medium is optically denser |
| A. | Ray bends towards normal |
| B. | Ray bends away from normal |
| C. | It passes in same path |
| D. | Unidentified |
| Answer» B. Ray bends away from normal | |
| 602. |
The bending of a light which passes from one medium to other medium is |
| A. | Reflection |
| B. | Refraction |
| C. | Attraction |
| D. | Repulsion |
| Answer» C. Attraction | |
| 603. |
The light ray passes in homogeneous medium |
| A. | Straight line |
| B. | Curved line |
| C. | Un identified |
| D. | Zig-zag mode |
| Answer» B. Curved line | |
| 604. |
Statement I: If refractive index of one medium is equal to refractive index of second medium, then beam does not bend at all Statement II: The bending of light does not depend on refractive indices of media. |
| A. | Both Statements are true. Statement-II is the correct explanation of Statement-I. |
| B. | Both Statements are true, Statement-II is not correct explanation of Statement-I. |
| C. | Statement-I is true. Statement-II is false. |
| D. | Statement-I is false. Statement-II is true. |
| Answer» B. Both Statements are true, Statement-II is not correct explanation of Statement-I. | |
| 605. |
For a concave mirror when object is placed at infinity the image is formed at |
| A. | Pole |
| B. | Principal focus |
| C. | Centre of curvature |
| D. | Infinity |
| Answer» C. Centre of curvature | |
| 606. |
The diameter of spherical mirror in which reflection takes place is called |
| A. | Radius of curvature |
| B. | Centre of curvature |
| C. | Linear aperture |
| D. | Focal length |
| Answer» D. Focal length | |
| 607. |
Convergence of concave mirror can be decreased by dipping in |
| A. | Water |
| B. | Oil |
| C. | Both oil & water |
| D. | Neither oil nor water |
| Answer» E. | |
| 608. |
Reflection is possible in case of |
| A. | Plane mirror |
| B. | Transparent glass |
| C. | Both (a) and (b) |
| D. | Neither (a) nor (b) |
| Answer» B. Transparent glass | |
| 609. |
Concave mirror acts as |
| A. | Converging mirror |
| B. | Diverging mirror |
| C. | both 1 and 2 |
| D. | Plane mirror |
| Answer» B. Diverging mirror | |
| 610. |
Statement I: The phenomenon of left appearing right and right appearing left on reflection in a plane mirror is called later inversion. Statement II: Number of images formed for an object kept in between two mirror placed at angle \[{{90}^{o}}\] to each other are 3. |
| A. | Both Statements are true, Statement-II is the correct explanation of Statement-I. |
| B. | Both Statements are true. Statement-II is not correct explanation of Statement-I. |
| C. | Statement-I is true, Statement-II is false. |
| D. | Statement-I is false, Statement-II is true. |
| Answer» C. Statement-I is true, Statement-II is false. | |
| 611. |
The spherical surfaces that have a property of reflection and that are highly polished are called |
| A. | Spherical mirror |
| B. | Plane mirror |
| C. | Plane glass plate |
| D. | Both 1 and 2 |
| Answer» B. Plane mirror | |
| 612. |
Statement I: A school girl wears a school uniform of length 1 m. She requires a mirror of length 0.5 m fixed on the vertical wall to see her uniform in the mirror. Statement II: The minimum height of the mirror to be required to see the full image of man of height h is h/2. |
| A. | Both Statements are true, Statement-II is the correct explanation of Statement-I. |
| B. | Both Statements are true, Statement-II is not correct explanation of Statement-I. |
| C. | Statement-I is true, Statement-II is false. |
| D. | Statement-I is false. Statement-II is true. |
| Answer» B. Both Statements are true, Statement-II is not correct explanation of Statement-I. | |
| 613. |
A light ray is allowed to fall on the plane mirror. Now the mirror is rotated in plane of incidence, then which of the following will not change |
| A. | Reflected ray |
| B. | Normal |
| C. | Incident ray |
| D. | Angle of incidence |
| Answer» D. Angle of incidence | |
| 614. |
You are watching your right palm in the plane mirror by placing it parallel to it, which is in front of you, then you will observe your palm as |
| A. | Right palm |
| B. | Left palm |
| C. | Inverted right palm |
| D. | Inverted left palm |
| Answer» C. Inverted right palm | |
| 615. |
A ray of light is incident on a plane mirror at an angle of \[{{60}^{o}}.\] What is the angle of deviation? |
| A. | \[{{60}^{o}}\] |
| B. | \[{{30}^{o}}\] |
| C. | \[{{90}^{o}}\] |
| D. | \[{{180}^{o}}\] |
| Answer» B. \[{{30}^{o}}\] | |
| 616. |
Statement I: The reflected ray formed by the plane mirror which is rotated with angle \[\theta \] is shifted through an angle of \[2\theta \] Statement II: Reflected ray rotates with an angle of \[2\theta \] if the mirror rotates with \[\theta \] . |
| A. | Both Statements are true, Statement-II is the correct explanation of Statement-I. |
| B. | Both Statements are true. Statement-II is not correct explanation of Statement-I. |
| C. | Statement-I is true. Statement-II is false. |
| D. | Statement-I is false, Statement-II is true. |
| Answer» B. Both Statements are true. Statement-II is not correct explanation of Statement-I. | |
| 617. |
The incident ray and the reflected ray from a mirror are mutually perpendicular to each other. The angle of incidence is |
| A. | \[{{90}^{o}}\] |
| B. | \[{{45}^{o}}\] |
| C. | \[{{22.5}^{o}}\] |
| D. | zero |
| Answer» C. \[{{22.5}^{o}}\] | |
| 618. |
The image formed by a plane mirror is always: |
| A. | Real |
| B. | Rrect |
| C. | Virtual |
| D. | Both (b) and (c) |
| Answer» E. | |
| 619. |
Why are certain bodies streamlined? |
| A. | To increase friction |
| B. | To decrease weight |
| C. | To reduce friction |
| D. | To increase weight |
| Answer» D. To increase weight | |
| 620. |
What is the frictional force exerted by fluids called? |
| A. | Lift |
| B. | Drag |
| C. | Rolling friction |
| D. | Dynamic friction |
| Answer» C. Rolling friction | |
| 621. |
Direction: Read the passage carefully and answer the following questions. In the figures shown, there are two jars, one is filled with water and other is empty. There are two balls of plasticine of the same size. What do you observe from the given information? |
| A. | Friction due to air is much smaller than the friction due to liquid. |
| B. | Friction due to air is much greater than the friction due to liquid. |
| C. | Friction due to air is equal to the friction due to liquid. |
| D. | None of these |
| Answer» B. Friction due to air is much greater than the friction due to liquid. | |
| 622. |
Why is a carrom board usually powdered before playing? |
| A. | For increasing friction |
| B. | For decreasing friction |
| C. | For decoration |
| D. | For fragrance |
| Answer» C. For decoration | |
| 623. |
Direction: Read the passage carefully and answer the following questions. In the figures shown, there are two jars, one is filled with water and other is empty. There are two balls of plasticine of the same size. In which jar does the ball reach the bottom first? |
| A. | In jar filled with water |
| B. | In jar without water |
| C. | In both the jars at the same time |
| D. | Cannot be said because data is insufficient. |
| Answer» C. In both the jars at the same time | |
| 624. |
In which of the following cases is friction desirable? |
| A. | Movement of piston in a cylinder |
| B. | A vehicle speeding |
| C. | Running on a track |
| D. | All of the above |
| Answer» C. Running on a track | |
| 625. |
Which of the following shows that friction exists between the two bodies? |
| A. | When the movement is decreased or prevented |
| B. | When there is a constant movement |
| C. | When electromagnetic charges are produced |
| D. | When there is a constant increase in weight |
| Answer» B. When there is a constant movement | |
| 626. |
Observe the given activity. What do you conclude from this? |
| A. | The frictional force depends on the nature of the two surfaces in contact. |
| B. | Frictional force increases as mass increases. |
| C. | Rolling friction is less than sliding friction. |
| D. | Frictional force is muscular force. |
| Answer» C. Rolling friction is less than sliding friction. | |
| 627. |
Which of the following reduces friction in a rotating machine? |
| A. | Wheels |
| B. | Rollers |
| C. | Ball bearings |
| D. | Handle |
| Answer» D. Handle | |
| 628. |
In which of the following does friction play a helpful role? (i) Striking a match stick (ii) Playing snooker (iii) Writing on the blackboard |
| A. | Only (i) and (ii) |
| B. | Only (ii) and (iii) |
| C. | Only (i), and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 629. |
Anoop and Sohail while studying about friction decided to perform an experiment. They placed equal masses of an ice block and sand paper block on an inclined plastic tray as shown below. What happens when both the blocks start moving? |
| A. | Ice block reaches the bottom of the tray first. |
| B. | Sand paper block reaches the bottom of the tray first. |
| C. | Both the blocks reach the bottom of the tray at the same time. |
| D. | Both the blocks offer the same amount of friction. |
| Answer» B. Sand paper block reaches the bottom of the tray first. | |
| 630. |
A Look at the figure given below. Which of the following forces is necessary for a person to climb the mountain? |
| A. | Gravitational force |
| B. | Electrical force |
| C. | Frictional force |
| D. | Magnetic force |
| Answer» D. Magnetic force | |
| 631. |
Harish rolled a small steel ball at one edge of the glass bowl as shown below. If there is no friction between the surfaces of the ball and the bowl, what will happen to the ball? |
| A. | The ball will roll out of the glass bowl near edge 'Q'. |
| B. | It will stop at centre point 'R' after a number of to-and-fro motions. |
| C. | It will keep moving between point 'P' and 'Q' and will never stop. |
| D. | It will not move at all since friction is required for movement. |
| Answer» D. It will not move at all since friction is required for movement. | |
| 632. |
Why do the soles of our shoes easily wear out? |
| A. | Due to the difference in the material of the sole |
| B. | Due to poor design |
| C. | Due to friction |
| D. | Due to their size |
| Answer» D. Due to their size | |
| 633. |
When a coin and a feather are dropped simultaneously from the same height, the coin strikes the ground first. Why? |
| A. | Gravitational force is less in the case of the coin. |
| B. | Mass of coin is less. |
| C. | Frictional force is less in the case of the coin. |
| D. | Magnetic force is stronger in the case of the coin. |
| Answer» D. Magnetic force is stronger in the case of the coin. | |
| 634. |
Which of the following makes it difficult to quickly stop a ship moving in a sea by applying brakes? |
| A. | Low friction |
| B. | Excess friction |
| C. | High speed |
| D. | External force |
| Answer» B. Excess friction | |
| 635. |
Complete the passage using the suitable words given in option below.A rough surface will offer a ___(i)___ frictional force than a smooth surface. The heavier the object, the ___(ii)___ will be the frictional force. Friction is a ___(iii)___ force. |
| A. | (i)(ii)(iii) LowerGreaterResistive |
| B. | (i)(ii)(iii) GreaterLowerContact |
| C. | (i)(ii)(iii) GreaterGreaterContact |
| D. | (i)(ii)(iii) LowerLowerResistive |
| Answer» D. (i)(ii)(iii) LowerLowerResistive | |
| 636. |
Which of the following materials is likely to have the least friction? |
| A. | Wood |
| B. | Cardboard |
| C. | Glass |
| D. | Paper |
| Answer» D. Paper | |
| 637. |
Which of the following is reduced by the correct measure of air pressure in the tyres? |
| A. | Static friction |
| B. | Sliding friction |
| C. | Rolling friction |
| D. | All of the above |
| Answer» D. All of the above | |
| 638. |
Which of the following activities will not be possible in the absence of friction? |
| A. | Holding a glass |
| B. | Writing on a paper |
| C. | Sitting on a chair |
| D. | All of the above |
| Answer» E. | |
| 639. |
Which of the following is a measure of the force required to keep an object moving with the same speed? |
| A. | Static friction |
| B. | Sliding friction |
| C. | Limiting friction |
| D. | All of the above |
| Answer» C. Limiting friction | |
| 640. |
How can friction be decreased? |
| A. | By using smooth surfaces |
| B. | By using dry surfaces |
| C. | By increasing the weight of the body |
| D. | All of the above |
| Answer» B. By using dry surfaces | |
| 641. |
In which of the following activities is friction useful? |
| A. | Driving a car |
| B. | Sitting on a chair |
| C. | Rowing a boat |
| D. | All of the above |
| Answer» E. | |
| 642. |
While walking on ice/why should one take small steps to avoid slipping? |
| A. | Smaller steps ensure larger friction. |
| B. | Smaller steps ensure smaller friction. |
| C. | Smaller steps ensure larger distance covered. |
| D. | Smaller steps ensure smaller distance covered. |
| Answer» B. Smaller steps ensure smaller friction. | |
| 643. |
A coin flicked on a table will stop. Why? |
| A. | It is heavy. |
| B. | No force is acting on it. |
| C. | The earth attracts the coin. |
| D. | The table exerts a frictional force. |
| Answer» E. | |
| 644. |
Sudhakar's bicycle was making a lot of squeaking noise. What should he do to stop the squeaking noise? |
| A. | Water |
| B. | Oil |
| C. | Sand |
| D. | Powder |
| Answer» C. Sand | |
| 645. |
A box was pushed equal distance on four different surfaces. The force needed for each surface was recorded in the given table. Surface M N O P Force Needed (N) 670 570 320 500 On which surface was the friction least? |
| A. | M |
| B. | N |
| C. | O |
| D. | P |
| Answer» D. P | |
| 646. |
What is the value of sliding friction for an object which requires 7 N of force to move it from rest? |
| A. | 7 N |
| B. | Greater than 7 N |
| C. | Less than 7 N |
| D. | 14 N |
| Answer» D. 14 N | |
| 647. |
When the applied force is doubled on an object and the object is still at rest, then friction becomes |
| A. | Doubled |
| B. | Halved |
| C. | Quadrupled |
| D. | Zero. |
| Answer» B. Halved | |
| 648. |
Which of the following is NOT an effect of frictional force? |
| A. | The grooves of tyres flattened due to use |
| B. | A rolling ball coming to a halt |
| C. | Leaves falling from a tree |
| D. | The holding of a pencil |
| Answer» D. The holding of a pencil | |
| 649. |
Which of the following is a disadvantage of friction? |
| A. | It enables the brakes of a car to work. |
| B. | It allows us to hold a pen. |
| C. | It helps us to sandpaper a table. |
| D. | It wears out our shoes. |
| Answer» E. | |
| 650. |
What will happen to a moving object if there is no friction? |
| A. | The object will stop. |
| B. | The object will keep on moving. |
| C. | The object will change speed. |
| D. | The object will change direction. |
| Answer» C. The object will change speed. | |