Physics online class test-4 of class-6 based on chapter -3 (force)

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In which of the following cases is friction a disadvantages to us

1 point

Writing with a pencil

Writing with a pen

Parts of a machine rubbing against each other

Running

None of these

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Which one among the following option is odd one

1 point

Magnetic force

Gravitational force

Electrostatic force

Nuclear force

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The friction does not depends on

1 point

Mass of the body

Weight of the body

Roughness of the surface

None of these

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A force to be expressed correctly requires

1 point

Only the magnitude

Both the magnitude and direction

Only the direction

None of these

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Name of student *

An Apple falls downward because of

1 point

Electrical force

Mechanical force

Magnetic force

None of these

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The frictional force acts in the direction of

1 point

Motion of the body

Force applied

Opposite to the motion of the body

None of these

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A Boat is streamlined to reduce the resistance to motion offered

1 point

By air

By water

By land

None of these

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A Force does not change

1 point

State of motion

Shape of the body

Mass of the body

Length of a body

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A force of 10 Newton acts on a body in the upward direction and a force of 12 Newton acts on it in the downward direction .find the resultant of the forces acting on the body?

1 point

22 Newton of force in upward direction

22 Newton of force in downward direction

2N of force in upward direction

Two Newton of force in downward direction

None of these

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A body is moving downwards. Forces of 20 Newton and 20 Newton act on it upwards, forces of 25 Newton and 20 Newton act on it downwards. Will its peed

1 point

Increase

Decrease

Remains same

None of these

Other:

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Roll No. *

Two forces of 9 Newton and 7 Newton acts on a body to the left while another force of 16 Newton acts on it to the right .find the resultant of the forces?

1 point

16 Newton of force towards left of the body.

16 Newton of force towards right of the body

7 Newton of force towards right of the body

9 Newton of force towards right of the body

Zero Newton of force

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Which of the following increases friction

1 point

Streamlining

Treads on a tyre

Polishing

Lubricant

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Which of the following is a contact force?

1 point

Gravitational force

Tension force

Electrostatic force

None of these

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Friction is not decreased if

1 point

An oil is sprayed

the surfaces are made dry

The surfaces are made wet

None of these

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Class & section *

Which of the following statement is incorrect

1 point

A force can change the direction of motion of a moving body.

The unit of weight is kilogram

The sliding friction is more than the rolling friction

Liquid offer more friction than the gases

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A charged comb picks of bits of paper because of

1 point

Electrostatic force

Contact force

Gravitational force

Magnetic force

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A body needs a force X just to start motion on a surface a force Y to continue its motion and a force Z to roll on the surface then

1 point

Z>Y

X<Y

Z>X

Y>Z

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The shape of a car is streamlined to decrease friction with

1 point

Air

Road

Water

None of these

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Friction is reduced by

1 point

Sprinkling sand on the surface

Making the surface rough

Making the surfaces dry

Making the surfaces wet

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The non contact forces in magnitude depend on the distance of separation. When distance of separation is doubled the magnitude of force becomes

1 point

Double

Half

One- fourth

One -third

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