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question_answer1)
Four cubical boxes, made up of the same material, are placed on the ground and are pushed with a constant force, \[{{d}_{1}},{{d}_{2}},{{d}_{3}}\], and \[{{d}_{4}}\] are the distances travelled by the boxes. They are related as \[{{d}_{3}}>{{d}_{2}}>{{d}_{4}}>{{d}_{1}}\]. The sides \[{{a}_{1}},{{a}_{2}},{{a}_{3}},\] and \[{{a}_{4}}\] of the respective boxes are related as
A)
\[{{a}_{1}}>{{a}_{2}}>{{a}_{3}}>{{a}_{4}}\] done
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B)
\[{{a}_{1}}>{{a}_{4}}>{{a}_{2}}>{{a}_{3}}\] done
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C)
\[{{a}_{3}}>{{a}_{2}}>{{a}_{4}}>{{a}_{1}}\] done
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D)
\[{{a}_{4}}>{{a}_{3}}>{{a}_{2}}>{{a}_{1}}\] done
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question_answer2)
Four similar boxes are labelled I, II, III, and IV. The masses of I and III are equal and the masses of II and IV are equal. The mass of box I is smaller than that of box II. Boxes I and II are placed in a grass field and boxes III and IV are placed on a marble floor. Which box requires the maximum force to be moved?
A)
I done
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B)
II done
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C)
III done
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D)
IV done
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question_answer3)
Vishnu and Mahesh are pushing a heavy box placed on a floor, as shown in the given figure. The arrow over the box shows the direction of motion of the box. Vishnu is applying a force of magnitude \[{{F}_{v}}\] and Mahesh is applying a force of magnitude \[{{F}_{m}}\].
Which of the following pairs of forces have the same direction?
A)
\[{{F}_{v}}\]and frictional force done
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B)
\[{{F}_{m}}\]and frictional force done
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C)
\[{{F}_{v}}\]and gravitational force done
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D)
\[{{F}_{m}}\] and gravitational force done
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question_answer4)
Ted learns about force of friction. He 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
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B)
Cover it with wax done
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C)
Pour water on it done
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D)
Pour oil on it done
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question_answer5)
In order to reduce the friction of a wheel-axle, a bicycle uses
A)
gears done
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B)
brakes done
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C)
pedals done
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D)
ball bearings done
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question_answer6)
Joe slides a plank of wood over the floor. As the wood plank slides over the floor, its speed can be increased the most if
A)
The floor is lubricated done
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B)
It is coated with oil done
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C)
Balls are placed under it done
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D)
It is smoothed with sand paper done
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question_answer7)
Which of the following surfaces will have the minimum friction?
A)
wet towel done
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B)
oily marble floor done
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C)
surface of cardboard done
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D)
surface of a new tyre done
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question_answer8)
If the force of friction were not to exist, then it would be almost impossible to both
A)
Speak and listen done
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B)
Write and walk done
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C)
Speak and walk done
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D)
Write and listen done
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question_answer9)
There are three types of friction, namely sliding, static, and rolling. They are respectively denoted as \[{{f}_{sl}},{{f}_{st,}}\] and \[{{f}_{roll}}\]. On a given surface, the given frictional forces are related as
A)
\[{{f}_{sl}}>{{f}_{st}}>{{f}_{roll}}\] done
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B)
\[{{f}_{st}}>{{f}_{sl}}>{{f}_{roll}}\] done
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C)
\[{{f}_{st}}>{{f}_{roll}}>{{f}_{sl}}\] done
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D)
\[{{f}_{sl}}>{{f}_{roll}}>{{f}_{st}}\] done
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question_answer10)
In order to move a stationary object, an interlocking between the two surfaces must be overcome. The minimum force required to overcome this interlocking is known as
A)
Static friction done
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B)
Rolling friction done
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C)
Sliding friction done
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D)
Kinetic friction done
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question_answer11)
A ball is rolled upward along an inclined plane. After reaching a certain height from the ground, it rolls down along the plane. During the motion of the ball along the inclined plane, the force of friction
A)
Always opposes the motion done
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B)
Always facilitates the motion done
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C)
First opposes and then facilitates the motion done
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D)
First facilitates and then opposes the motion done
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question_answer12)
A formula one car is shown in the given figure. Formula one (F1) is one of the most famous and fastest racing events of the world. In this sport, cars can acquire speeds as high as 320 km/hr. One of the reasons of the high speeds is the design of the F1 cars. The shape of the car helps in
A)
Reducing the air drags done
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B)
Reducing the car weight done
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C)
Increasing the car efficiency done
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D)
Increasing the consumption fuel done
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