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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.
| 651. |
When friction is acting in the direction of P, in which direction do you think the force is applied? |
| A. | P |
| B. | Q |
| C. | R |
| D. | S |
| Answer» D. S | |
| 652. |
When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is such that it acts |
| A. | In the backward direction on the front wheel and in the forward direction on the rear wheel |
| B. | In the forward direction on the front wheel and in the backward direction on the rear wheel |
| C. | In the forward direction on both front and the rear wheels |
| D. | None of these. |
| Answer» B. In the forward direction on the front wheel and in the backward direction on the rear wheel | |
| 653. |
Why are spikes provided in the shoes of athletes? |
| A. | As a decoration |
| B. | To increase friction |
| C. | To decrease friction |
| D. | To give shape |
| Answer» C. To decrease friction | |
| 654. |
John carried out an experiment to find out how different surfaces (P, Q, R and S) affect the distance a car travelling at 50 km/h needed to stop once the brakes are applied. The results are shown below: Type of road surfaces P Q R S Stopping distance(m) 18 15 19 27 Which type of road will provide the most friction for the car to stop? |
| A. | P |
| B. | Q |
| C. | R |
| D. | S |
| Answer» C. R | |
| 655. |
Why are the head of a match stick and the sides of a match box deliberately made rough? |
| A. | To increase friction |
| B. | To decrease friction |
| C. | To increase the amount of heat |
| D. | To decrease the amount of heat |
| Answer» B. To decrease friction | |
| 656. |
A man sharpens his knife as shown in the figure. Which of the properties of friction are in use? (i) Friction helps us to hold objects. (ii) Friction acts in the opposite direction of motion. (iii) Friction causes the surfaces in contact to wear away. (iv) Friction produces heat energy. |
| A. | (i) and (ii) |
| B. | (i), (iii) and (iv) |
| C. | (iii) and (iv) |
| D. | All (i), (ii), (iii) and (iv) |
| Answer» E. | |
| 657. |
Why does a meteor burn upon entering the earth's atmosphere? |
| A. | Due to gravitational pull |
| B. | Due to the heat of the earth |
| C. | Due to solar radiation |
| D. | Due to excess friction in air |
| Answer» E. | |
| 658. |
To every action there is always an equal and opposite reaction. Which of the following statements is correct regarding this? |
| A. | The buggy pulls the horse backward just as hard as the horse pulls the buggy forward. Both of them would not move forward if surface is frictionless. |
| B. | The horse pulls the buggy forward slightly harder than the buggy pulls the horse backward, so they move forward. |
| C. | The horse can pull the buggy forward only if the horse weighs more than the buggy. |
| D. | None of these |
| Answer» B. The horse pulls the buggy forward slightly harder than the buggy pulls the horse backward, so they move forward. | |
| 659. |
Which of the following activities is easier to perform on a drum of 10 kg? |
| A. | Dragging the drum |
| B. | Lifting the drum |
| C. | Rolling the drum |
| D. | All of the above need the same effort |
| Answer» D. All of the above need the same effort | |
| 660. |
In the decreasing order of magnitude, which of the following is correct? |
| A. | Rolling < static < sliding friction |
| B. | Static > sliding > rolling friction |
| C. | Static > rolling > sliding friction |
| D. | Sliding < static < rolling friction |
| Answer» C. Static > rolling > sliding friction | |
| 661. |
What type of a force is friction? |
| A. | Contact force |
| B. | Non-contact force |
| C. | Electrostatic force |
| D. | Magnetic force |
| Answer» B. Non-contact force | |
| 662. |
Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement. |
| A. | Rolling, Static, Sliding |
| B. | Rolling, Sliding, Static |
| C. | Static, Sliding, Rolling |
| D. | Sliding, Static, Rolling |
| Answer» D. Sliding, Static, Rolling | |
| 663. |
Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different Surfaces in increasing order will be |
| A. | Wet marble floor, dry marble floor, newspaper and towel. |
| B. | Newspaper, towel, dry marble floor, wet marble floor. |
| C. | Towel, newspaper, dry marble floor, wet marble floor |
| D. | Wet marble floor, dry marble floor, towel, newspaper |
| Answer» B. Newspaper, towel, dry marble floor, wet marble floor. | |
| 664. |
Atul noticed that the joints of the main door of his house produce a noise every time the gate is opened or closed. He wants to reduce the sound by applying something to the joints. To reduce the noise of the door, Ami must |
| A. | Drop water in the joints |
| B. | Spread sand on the joints |
| C. | Apply grease on the joints |
| D. | Put chalk powder on the joints |
| Answer» D. Put chalk powder on the joints | |
| 665. |
A cyclist moving on a road saw a ditch at a distance ahead of him. He firmly applied the brake that caused the cycle to stop almost instantaneously. The applied opposing force that causes the bicycle to come to rest acts between |
| A. | Hand and Brake |
| B. | Leg and Paddle |
| C. | Pads and Tyre |
| D. | Tyre and Road |
| Answer» D. Tyre and Road | |
| 666. |
The picture of four people pushing four heavy boxes of equal weight on a surface in four different situations I, II, III, and IV respectively, is shown in the given figure.The maximum and the minimum friction offered by the ground will be for the situations |
| A. | I and II |
| B. | III and IV |
| C. | II and III |
| D. | I and IV |
| Answer» C. II and III | |
| 667. |
Arpita observes that the match stick is not catching fire even when she is rubbing it gently against the comer of the matchbox. The match box had been used many times before also. The possible reason for the given problem is that the |
| A. | Matchbox has lost its chemical |
| B. | Matchbox has lost its roughness |
| C. | Quality of wood used in the match stick is not good |
| D. | Quality of chemical used in the match stick is not good |
| Answer» C. Quality of wood used in the match stick is not good | |
| 668. |
A car designer designed four cars labelled as I, II, III, and IV. The shapes of the cars are shown in given figure. On a test drive, these cars are moving with the same speed on a highway. The tank of each car is filled with the same quantity of fuel.In covering equal distances, least fuel is consumed by car |
| A. | I |
| B. | II |
| C. | III |
| D. | IV |
| Answer» D. IV | |
| 669. |
The given figure shows three identical carom boards labeled I, II, and III. Sand particles have been poured on board I and oil has been poured on board II.Equal forces are applied on three identical pucks on the three carom boards such that their speeds on the three carom boards are \[{{v}_{1}},{{v}_{2}}\]and \[{{v}_{3}}\] respectively. The relation among the speeds of the pucks on the three carom boards is |
| A. | \[{{v}_{1}}>{{v}_{3}}>{{v}_{2}}\] |
| B. | \[{{v}_{1}}<{{v}_{3}}<{{v}_{2}}\] |
| C. | \[{{v}_{1}}>{{v}_{2}}>{{v}_{3}}\] |
| D. | \[{{v}_{1}}<{{v}_{2}}<{{v}_{3}}\] |
| Answer» C. \[{{v}_{1}}>{{v}_{2}}>{{v}_{3}}\] | |
| 670. |
Brahma rolls down a ball from a certain height along an inclined plane. After reaching the bottom of the inclined plane, the ball rolls some distance horizontally along a surface. Brahma uses four different objects as the horizontal surface at the bottom of the inclined plane. The four objects are frosted glass sheet, cardboard sheet, sand paper, and wrinkle-free towel. In each case, he measures the distance travelled by the ball from the bottom of the inclined plane along the horizontal surface. On which surface will the ball move the least distance? |
| A. | Sand paper |
| B. | Cardboard sheet |
| C. | Frosted glass sheet |
| D. | Wrinkle-free towel |
| Answer» E. | |
| 671. |
A box is placed on three different surfaces "a marble floor, a cardboard sheet, and a sandpaper. The minimum forces required to simply move the box on the surfaces are \[{{F}_{m}},{{F}_{c}},\] and \[{{F}_{s}}\] respectively. The three forces can be arranged in the decreasing order as |
| A. | \[{{F}_{c}}<{{F}_{m}}<{{F}_{s}}\] |
| B. | \[{{F}_{c}}<{{F}_{s}}<{{F}_{m}}\] |
| C. | \[{{F}_{m}}<{{F}_{c}}<{{F}_{s}}\] |
| D. | \[{{F}_{s}}<{{F}_{c}}<{{F}_{s}}\] |
| Answer» D. \[{{F}_{s}}<{{F}_{c}}<{{F}_{s}}\] | |
| 672. |
Pappu is applying a large force in order to push a heavy box lying on the floor. Then, his younger brother, Chintu spreads a little bit of oil on the floor. Now, Pappu feels that it has become relatively easier to move the box. This happens because the |
| A. | Oil magnifies the applied muscular force |
| B. | Oil reduces the friction between two surfaces |
| C. | Application of oil generates an upward thrust |
| D. | Application of oil reduces the gravitational force |
| Answer» C. Application of oil generates an upward thrust | |
| 673. |
Friction has advantages as well as disadvantages. Dilip prepares a list of some of the advantageous applications of friction, as shown in the given table. Application of friction I. Walking II. Writing III. Wearing out of shoes IV. Igniting a matchstick V. Gripping an object Which of the items listed in me given table is riot an advantage of friction? |
| A. | II |
| B. | III |
| C. | IV |
| D. | V |
| Answer» C. IV | |
| 674. |
The sides of matchboxes are made rough so as to |
| A. | Hold them easily |
| B. | Reduce their cost |
| C. | Make them strong |
| D. | Increase their friction |
| Answer» E. | |
| 675. |
Which of the following actions does not increase friction? |
| A. | Threading tires |
| B. | Grinding on stones |
| C. | Making spikes on shoes |
| D. | Powdering a carom board |
| Answer» E. | |
| 676. |
In a cycling race, it is observed that a cyclist normally bends his body forward (as shown in the given figure).The cyclist bends in order to |
| A. | Feel comfortable |
| B. | Reduce his weight |
| C. | Reduce the air drag |
| D. | Increase energy consumptionlution |
| Answer» D. Increase energy consumptionlution | |
| 677. |
The diagram given below shows a ball rolling down a slope. The ball finally comes to a stop by itself. Which of the following statements describes what most likely caused the ball to stop? |
| A. | The heat produced as a result of its motion. |
| B. | The speed produced as a result of its motion. |
| C. | The friction between the ball and the surface. |
| D. | The energy produced as a result of its motion. |
| Answer» D. The energy produced as a result of its motion. | |
| 678. |
The joints of Latifs garage door are producing sound. To solve this problem, he must apply |
| A. | Saw dust in the joints of the door |
| B. | Water in the joints of the door |
| C. | Sand in the joints of the door |
| D. | Oil in the joints of the door |
| Answer» E. | |
| 679. |
Which of the following doesnt reduce friction? |
| A. | Ball bearing |
| B. | Lubricant |
| C. | Rolling |
| D. | Grooving and treading |
| Answer» E. | |
| 680. |
Statement I: It is convenient to pull luggage fitted with rollers. Statement II: Rolling friction is smaller than sliding friction. |
| A. | Both statements I and II are true, statement II is the correct explanation for statement I. |
| B. | Both statements I and II are true, statement II is not the correct explanation for statement I. |
| C. | Statement I is true and statement II is false. |
| D. | Statement I is false and statement II is true. |
| Answer» B. Both statements I and II are true, statement II is not the correct explanation for statement I. | |
| 681. |
While walking on ice one should take small steps to avoid slipping. This is because smaller steps ensure. |
| A. | Large friction |
| B. | Smaller friction |
| C. | Large normal force |
| D. | Small normal force |
| E. | None of these |
| Answer» B. Smaller friction | |
| 682. |
The tyres of vehicles get heated after they move on road. This is because of the |
| A. | Conversion of potential energy into heat energy |
| B. | Absorption of heat from the atmosphere |
| C. | Friction between the tyres and the road |
| D. | Conversion of mass into energy |
| Answer» D. Conversion of mass into energy | |
| 683. |
The force of friction decreases with ____i___ in interlocking between the surfaces in contact and it increases with ____ii____ in the pressing force between the surfaces. The information in which alternative completes the given statement? |
| A. | i-an increase, ii-an increase |
| B. | i-a decrease, ii-an increase |
| C. | i-an increase, ii-a decrease |
| D. | i-a decrease, ii-a decrease |
| Answer» C. i-an increase, ii-a decrease | |
| 684. |
In which of the following alternatives are the activities categorised correctly according to the advantages and disadvantages of the role of friction in them? |
| A. | Advantage of Friction Disadvantage of Friction Walking on a surface Writing on a blackboard Flying of an airplane Wearing out of a shoe Wearing out of a shoe |
| B. | Advantage of Friction Disadvantage of Friction Flying of an airplane Writing on a blackboard Wearing out of a shoe Applying brake on a moving car Walking on a surface |
| C. | Advantage of Friction Disadvantage of Friction Applying brake on a moving car Flying of an airplane Writing on a blackboard Wearing out of a shoe Walking on a surface |
| D. | Advantage of Friction Disadvantage of Friction Applying brake on a moving car Flying of an airplane Writing on a blackboard Walking on a surface Wearing out of a shoe |
| Answer» D. Advantage of Friction Disadvantage of Friction Applying brake on a moving car Flying of an airplane Writing on a blackboard Walking on a surface Wearing out of a shoe | |
| 685. |
The given figure shows a man trailing a trolley bag. Suddenly, the wheels of the trolley bag get locked. The man realises that he has to put extra effort to drag the bag. The man finds it difficult to drag the bag because |
| A. | Friction between the wheels and the ground becomes negligible |
| B. | Static fiction, which is greater than rolling friction, comes into play |
| C. | Sliding friction, which is greater than rolling friction, comes into play |
| D. | Friction between the wheels and the ground starts opposing the motion |
| Answer» D. Friction between the wheels and the ground starts opposing the motion | |
| 686. |
Luis throws four stones having the same weight on four different surfaces. The surfaces are icy, dry, sandy, and cemented. He throws each stone with the same force. On which of the given surfaces will the stone go the maximum distance before it stops? |
| A. | Icy surface |
| B. | Dry surface |
| C. | Sandy surface |
| D. | Cemented surface |
| Answer» B. Dry surface | |
| 687. |
A thief sneaked into Larry's house. As he opened the door to Larry's room, the door made a squeaking noise. The noise alerted Larry and the thief was caught. The squeaking sound of a door can be reduced by |
| A. | Using ball bearings in the door hinge |
| B. | Using a lubricant on the door hinge |
| C. | Using a lever to open the door |
| D. | Using a gear to open the door |
| Answer» C. Using a lever to open the door | |
| 688. |
Thaddeus is riding his bicycle. The speed of the bicycle decreases as he stops pedaling it. The speed of the bicycle decreases because of |
| A. | Frictional force |
| B. | Muscular force |
| C. | Electrical force |
| D. | Magnetic force |
| Answer» B. Muscular force | |
| 689. |
Anthony pushes a metal box such that it slides over a surface. After sometime, the bottom of the box gets heated. The bottom of the box gets heated because of the |
| A. | Potential energy of the box |
| B. | Conversion of mass into energy |
| C. | Absorption of heat from the atmosphere |
| D. | Friction between the box and the surface |
| Answer» E. | |
| 690. |
The tires of vehicles get heated after they move on road. This is because of the |
| A. | Conversion of potential energy into heat energy |
| B. | Absorption of heat from the atmosphere |
| C. | Friction between the tires and the road |
| D. | Conversion of mass into energy |
| Answer» D. Conversion of mass into energy | |
| 691. |
Gregory rolls a plastic ball on the floor. The ball stops after rolling a certain distance. The ball stops because of the presence of |
| A. | Gravitational force |
| B. | Frictional force |
| C. | Magnetic force |
| D. | Electric force |
| Answer» C. Magnetic force | |
| 692. |
The given figure shows a ball rolling down an inclined plane. The direction of motion of the ball is represented by arrow I. Arrows II and III respectively represent the directions of |
| A. | Rolling frictional force and gravitational force |
| B. | Gravitational force and normal reaction |
| C. | Rolling frictional force and air friction |
| D. | Air friction and normal reaction |
| Answer» D. Air friction and normal reaction | |
| 693. |
Cars are designed in particular shapes, called streamline shapes. This is done to increase their speed. Which force is reduced by the streamline shape design? |
| A. | Resistance force of air |
| B. | Frictional force of road |
| C. | Electric force of battery |
| D. | Gravitational force of Earth |
| Answer» B. Frictional force of road | |
| 694. |
Lubricants are used to increase the efficiency and reduce the wear and tear of machines. The application of lubricants between machine parts helps to |
| A. | Reduce friction |
| B. | Develop more heat |
| C. | Increase gravitational force |
| D. | Change atmospheric pressure |
| Answer» B. Develop more heat | |
| 695. |
Ram and Shyam are pushing two identical boxes. Ram is pushing box I that is placed on a wheel cart, while Shyam is pushing box II that is placed on the ground. Both Ram and Shyam are trying to maintain a steady motion of the boxes. It is relatively difficult for Shyam to maintain a steady motion of box II because |
| A. | Sliding friction is greater than rolling friction |
| B. | Rolling friction is greater than sliding friction |
| C. | Static friction is greater than sliding friction |
| D. | Sliding friction is greater than static friction |
| Answer» B. Rolling friction is greater than sliding friction | |
| 696. |
Static friction is ___ than rolling friction and rolling friction is ___than sliding friction. |
| A. | More, less |
| B. | Less, more |
| C. | Equal |
| D. | None of these |
| Answer» C. Equal | |
| 697. |
A ball moves on a smooth frictionless surface before entering a surface covered with grass. The speed of the ball at three different points is shown in the given figure. The relation among the speeds of the ball at the three given points is |
| A. | \[{{v}_{1}}<{{v}_{2}}<{{v}_{3}}\] |
| B. | \[{{v}_{1}}>{{v}_{2}}>{{v}_{3}}\] |
| C. | \[{{v}_{1}}={{v}_{2}}>{{v}_{3}}\] |
| D. | \[{{v}_{1}}={{v}_{2}}<{{v}_{3}}\] |
| Answer» D. \[{{v}_{1}}={{v}_{2}}<{{v}_{3}}\] | |
| 698. |
Airplanes are designed in a particular shape called the streamline shape. The streamline design reduces the |
| A. | Speed of the plane |
| B. | Weight of the plane |
| C. | The cost of production |
| D. | Heat generated by air friction |
| Answer» E. | |
| 699. |
The designing of Cars has improved over the years. These days, cars are designed to be more aerodynamic. Cars are designed to be more aerodynamic in order to |
| A. | Increase their speed |
| B. | Make them attractive |
| C. | Make them less polluting |
| D. | Increase the space inside them |
| Answer» B. Make them attractive | |
| 700. |
Friction between two surfaces cannot be reduced by using |
| A. | Oil |
| B. | Gears |
| C. | Grease |
| D. | Rollers |
| Answer» E. | |