Class XI

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Class XI

LAWS OF MOTION

SUBJECT - PHYSICS (Theory)

Time allowed : 25 Min. TEST - I Maximum Marks : 15

All questions are compulsory. Only first attempt will be accepted. Marks would be deducted if test not submitted in the allowed time.

Name *

Father's Name *

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Stream *

Non Medical

Medical

Q 1 A constant retarding force of 50 N is applied to a body of mass 20 kg moving initially with a speed of 15 m/s . How long does the body take to stop? *

1 point

Q 2 Rolling friction is *

1 point

greater than static friction

less than static friction

greater than or equal to static

equal to static friction

Q 3 A monkey of mass 40 kg climbs on a rope which can stand a maximum tension of 600 N. What is the tension in the rope if the monkey falls down the rope nearly freely under gravity? *

1 point

400 N

200 N

0 N

600 N

Q 4 When several forces act on a body *

1 point

the effect on its motion is the same as when a single force, equal to the vector sum (resultant) of the forces, acts on the body.

the effect on its motion is the same as when a single force, an algebraic sum only in the horizontal direction, acts on the body.

the effect on its motion will be equal to a single force equal to the algebraic sum of the forces.

the effect on its motion is the same as when a single force acts on the body.

Q 5 If an elevator , moving vertically up with an acceleration g, the force exerted on the floor by a passenger of mass M is *

1 point

Zero

2Mg

Mg/2

Q 6 A marble block of mass 2 Kg lying on ice when given a velocity of 6 m/s is stopped by friction in 10s. Then coefficient of friction is *

1 point

0.01

0.02

0.03

0.06

Q 7 Two masses 5 kg and 10 kg are connected at the ends of an inextensible string passing over a pulley . When masses are released , then acceleration of masses will be *

1 point

g/2

g/3

g/4

Q 8 A body of weight W rests on a frictional surface. Angle between force of friction and normal reaction is *

1 point

Option 1

Option 2

Option 3

Option 4

Q 9 If normal force is doubled , then coefficient of friction is *

1 point

Halved

Doubled

Trippled

Remain unchanged

Q 10 A balloon with mass m is descending with acceleration a < g. How much mass should be removed from it so that it starts moving up with an acceleration a? *

1 point

2 m a /(g + a)

2 m a / (g - a)

m a /(g + a)

m a / (g - a)

Assertion Reason Type Question 11 to 15: In each of the following questions, a statement of Assertion A is followed by a statement of Reason R. Choose the correct one from the following

a) If both Assertion and Reason are true and Reason is correct explanation of Assertion.
b) If both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
c) Assertion is true and Reason is false.
d) Both Assertion and Reason is false.

Q 1 1 Assertion: Centripetal force is always required for motion in curved path. Reason: On a banked curved track, vertical component of normal reaction provides the necessary centripetal force. *

1 point

Q 1 2 Assertion: A man in a closed cabin, which is falling freely, does not experience gravity. Reason: Inertial and gravitational masses have equivalence. *

1 point

(a)

(b)

(c)

(d)

Q 1 3 Assertion: Use of ball-bearings between two moving parts of a machine is a common practice. Reason: Ball-bearings reduce vibrations and provide good stability. *

1 point

Q 1 4 Assertion: Thrust on a rocket depends not only on the rate of decrease of mass. Reason: Thrust also depends upon the exhaust speed of gases. *

1 point

Q 1 5 Assertion: Frictional forces are conservative force. Reason: Potential energy can be associated with frictional force. *

1 point

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