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CBSE
Class 11 Physics
Motion In A Plane
Quiz 2
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Two projectiles are projected with the same velocity. If one is projected at an angle of 30° and the other at 60° to the horizontal, then the ratio of maximum heights reached is
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3 : 1
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1 : 3
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1 : 2
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2 : 1
An aeroplane moving horizontally with a speed of 720 km/h drops a food packet while flying at a height of 396.9 m. The time taken by the food packet to reach the ground and its horizontal range are (Take $g = 9.8 m/s^2$)
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3 sec and 2000 m
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5 sec and 500 m
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8 sec and 1500 m
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9 sec and 1800 m
The angular velocity of the seconds-hand in a watch is
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0.053 rad/sec
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0.210 rad/sec
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0.105 rad/sec
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0.42 rad/sec
A particle A is dropped from a height and another particle B is projected in horizontal direction with speed of 5 m/s from the same height, then correct statements is
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particle A will reach at ground first with respect to particle B.
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particle B will reach at ground first with respect to particle A.
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both particles will reach at ground simultaneously.
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both particles will reach at ground with same speed.
A stone tied to the end of a string of 1 m long is whirled in a horizontal circle at a constant speed. If the stone makes 22 revolutions in 44 seconds, what is the magnitude and direction of acceleration of the stone?
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$\pi^2 m/s^2$ , and direction along the radius towards the center.
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$\pi^2 m/s^2$ , and direction along the radius away from the centre.
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$\pi^2 m/s^2$ , and direction along the tangent to the circle.
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$\frac{\pi^2}{4} m/s^2$ , and direction along the radius towards the center.
The width of a river is 1 km. The velocity of a boat is 5 km/h. The boat covered the width of the river in the shortest time of 15 minutes. Then the velocity of the river stream is
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3 km/h
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4 km/h
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$\sqrt{29} km/h$
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$\sqrt{41} km/h$
What determines the nature of the path followed by the particle?
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Speed
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Velocity
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Acceleration
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Both Velocity and Acceleration
Which of the following is constant in a projectile motion?
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Velocity of projection
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The horizontal component of the velocity
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The vertical component of the velocity
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All of these
In a two dimensional motion, instantaneous speed $v_0$ is a positive constant. Then which of the following are necessarily true?
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The average velocity is not zero at any time.
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Average acceleration must always vanish.
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Displacements in equal time intervals are equal.
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Equal path lengths are traversed in equal intervals.
In the following question, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct one out of the given responses Assertion: When a body is projected at an angle 45 °, its range is maximum. Reason: For the maximum range, the value of sin 20 ° should be equal to one.
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If both assertion and reason are true and reason is the correct explanation of the assertion.
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If both assertion and reason are true, but reason is not correct explanation of the assertion.
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If assertion is true, but reason is false.
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If both assertion and reason are false.
In the following question, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct one out of the given responses Assertion : Two balls of different masses are thrown vertically upwards with the same speed. They will pass through their point of projection in the downward direction with the same speed. Reason : The maximum height and downward velocity attained at the point of projection are independent of the mass of the ball.
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If both assertion and reason are true and reason is the correct explanation of the assertion.
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If both assertion and reason are true, but reason is not correct explanation of the assertion.
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If assertion is true, but reason is false.
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If both assertion and reason are false.
In the following question, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct one out of the given responses Assertion: Displacement of a body may be zero when the distance traveled by h it is not zero. Reason: The displacement is the longer distance between initial and final position
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If both assertion and reason are true and reason is the correct explanation of the assertion.
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If both assertion and reason are true, but reason is not correct explanation of the assertion.
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If assertion is true, but reason is false.
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If both assertion and reason are false.
In the following question, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct one out of the given responses Assertion: In javelin throw, the athlete throws the projectile at an angle slightly more than $45^0$. Reason: The maximum range does not depend upon the angle of projection.
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If both assertion and reason are true and reason is the correct explanation of the assertion.
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If both assertion and reason are true, but reason is not correct explanation of the assertion.
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If assertion is true, but reason is false.
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If both assertion and reason are false.
A bus is moving on a straight road towards north with a uniform speed of 50 Km/hr, then it turns left through $90^0$. If the speed remains unchanged after turning, the increase in velocity of bus in the turning process is,
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70.7 Km/hr along south west direction.
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Zero
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50 km/hr along west
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70.7 Km/hr along north west direction.
Link type comprehension A ball is thrown at an angle θ and another is thrown at an angle 90 -θ with the horizontal direction from the same point with velocity 39.2 m/s. The second ball reaches 50m higher than the first ball Find the height reached by first ball
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13.2 m
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14.2 m
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64.2 m
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11 m
Find the height reached by second ball
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14.2 m
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34.2 m
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64.2 m
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11 m
A boat is moving with the velocity 4 i + 6 j with respect to ground . The water in the river is moving with the velocity is -3i - 4 j m/s with respect to ground. The relative velocity of boat with respect to water is
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6 i + 8j
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7 i + 10j
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6 i - 8j
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7 i - 10j
A body revolving in a circle with uniform speed possesses
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uniform acceleration
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no acceleration
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tangential acceleration
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normal acceleration.
The horizontal range of a projectile is 400 m. The maximum height attained by it will be
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400 m
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100 m
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200 m
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300 m
A boat is sent across a river with a velocity of 8 km/h. If the resultant velocity of the boat is 10 km/h,the river is flowing with a velocity of
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6 km/hr
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8 km/hr
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10 km/hr
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12.8 km/hr
0 h : 0 m : 1 s
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