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question_answer1)
A wooden block is pushed such that it starts moving on a horizontal table, as shown in the given figure. It is observed that the block stops after traveling some distance. The block stops because the frictional force acts
A)
Toward the left done
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B)
Toward the right done
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C)
In the upward direction done
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D)
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question_answer2)
Jackson is rearranging his study. He decides to move the file cabinet to the comer of the room. He starts pushing the file cabinet over the floor. Which force is acting between the floor and the file cabinet?
A)
Tension done
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B)
Frictional done
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C)
Compressive done
clear
D)
Gravitational done
clear
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question_answer3)
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 done
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B)
Frictional force of road done
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C)
Electric force of battery done
clear
D)
Gravitational force of Earth done
clear
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question_answer4)
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 done
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B)
Frictional force done
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C)
Magnetic force done
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D)
Electric force done
clear
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question_answer5)
The tires of vehicles get heated after they move on road. This is because of the
A)
Conversion of potential energy into heat energy done
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B)
Absorption of heat from the atmosphere done
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C)
Friction between the tires and the road done
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D)
Conversion of mass into energy done
clear
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question_answer6)
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 done
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B)
Conversion of mass into energy done
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C)
Absorption of heat from the atmosphere done
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D)
Friction between the box and the surface done
clear
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question_answer7)
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 done
clear
B)
Using a lubricant on the door hinge done
clear
C)
Using a lever to open the door done
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D)
Using a gear to open the door done
clear
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question_answer8)
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 done
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B)
Muscular force done
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C)
Electrical force done
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D)
Magnetic force done
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question_answer9)
A body of weight 50 N is placed on a smooth surface. If the force required to move the body on the surface is 30 N the coefficient of friction is
A)
0.60 done
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B)
1.2 done
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C)
0.3 done
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D)
1.67 done
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question_answer10)
A body of mass 25 kg, is placed on a horizontal surface whose coefficient of friction 0.25. Find the frictional force action on it. Take (\[g=10m{{s}^{-2}}\])
A)
150 N done
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B)
175 N done
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C)
62.5 N done
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D)
53.3 N done
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question_answer11)
Tony is playing carom along with his friends. After completing 2 games, some talcum powder is rubbed on to the board. Talcum powder is used on the board to
A)
Reduce its friction done
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B)
Decrease its mass done
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C)
Improve its fragrance done
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D)
Improve its conductivity done
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question_answer12)
Two boxes, having the same weight, are kept between two vertical walls. Calvin lifts one of the boxes (against the pull of gravitational force) with the help of a rope. Before lifting the second box, he lubricates the vertical walls with oil. As a result, he has to apply less force to lift the second box. Which force is reduced as a result of the lubrication of the walls?
A)
Gravitational done
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B)
Compressive done
clear
C)
Frictional done
clear
D)
Magnetic done
clear
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question_answer13)
John pushes a table with wheels under it. At the same time, Abraham pushes a table without any wheels under it. Both the .tables weigh the same. The two tables move at the same speed, but John applies lesser force than Abraham.
Which force is reduced by the wheels under John's table?
A)
Magnetic done
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B)
Frictional done
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C)
Electrostatic done
clear
D)
Gravitational done
clear
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question_answer14)
Olivia pushes a toy car on a rough surface. The toy car travels 4 m before stopping. The distance travelled by the toy car can be increased by
A)
Loading the toy car with a stone done
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B)
Removing the wheels of the toy car done
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C)
Pushing the toy car with less force done
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D)
Pushing the toy car on a smooth surface done
clear
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question_answer15)
Ted learns about force of friction and tries out different ways of reducing as well as increasing the friction on the surface of his driveway. In order to reduce the friction on the surface of the drive way, Ted should
A)
Cover it with small pebbles done
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B)
Cover it with sand done
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C)
Spread grit on it done
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D)
Pour oil on it done
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question_answer16)
Ted learns about force of friction and tries out different ways of reducing as well as increasing the friction on the surface of his driveway. In order to increase the friction on the surface of the driveway, Ted should'
A)
Cover it with small pebbles done
clear
B)
Cover it with wax done
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C)
Pour water on it done
clear
D)
Pour oil on it done
clear
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question_answer17)
On which of the following types of roads will a sledge travel the farthest?
A)
Dry road done
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B)
Icy road done
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C)
Carpeted road done
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D)
Cemented road done
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question_answer18)
A magnet can pull an iron nail toward itself. The maximum distance from which the magnet (shown in the given figure) can pull the nail is labelled as d.
On which surface will this distance d be relatively large?
A)
Cemented surface done
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B)
Carpeted surface done
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C)
Sandy surface done
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D)
Oily surface done
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question_answer19)
A mechanical system produces heat energy because of
A)
Radiation done
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B)
Convection done
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C)
Lubrication done
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D)
Friction done
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question_answer20)
Friction between two surfaces cannot be reduced by using
A)
Oil done
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B)
Gears done
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C)
Grease done
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D)
Rollers done
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question_answer21)
A ball rolls down an inclined plane, as shown in the given figure. The surface of the inclined plane is rough.
A)
B)
C)
D)
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question_answer22)
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 done
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B)
Make them attractive done
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C)
Make them less polluting done
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D)
Increase the space inside them done
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question_answer23)
Airplanes are designed in a particular shape called the streamline shape. The streamline design reduces the
A)
Speed of the plane done
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B)
Weight of the plane done
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C)
The cost of production done
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D)
Heat generated by air friction done
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question_answer24)
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)
\[{{v}_{1}}<{{v}_{2}}<{{v}_{3}}\] done
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B)
\[{{v}_{1}}>{{v}_{2}}>{{v}_{3}}\] done
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C)
\[{{v}_{1}}={{v}_{2}}>{{v}_{3}}\] done
clear
D)
\[{{v}_{1}}={{v}_{2}}<{{v}_{3}}\] done
clear
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question_answer25)
Static friction is ___ than rolling friction and rolling friction is ___than sliding friction.
A)
More, less done
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B)
Less, more done
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C)
Equal done
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D)
None of these done
clear
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question_answer26)
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 done
clear
B)
Rolling friction is greater than sliding friction done
clear
C)
Static friction is greater than sliding friction done
clear
D)
Sliding friction is greater than static friction done
clear
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question_answer27)
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 done
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B)
Develop more heat done
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C)
Increase gravitational force done
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D)
Change atmospheric pressure done
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question_answer28)
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 done
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B)
Gravitational force and normal reaction done
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C)
Rolling frictional force and air friction done
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D)
Air friction and normal reaction done
clear
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