CBSE
Multiple Choice QuestionsIn a carnival ride, the passengers travel in a circle of radius 5.0 m, making one complete circle in 4.0 s. What is the acceleration?
24.6 m/s2
12.3 m/s2
6.15 m/s2
49.2 m/s2
Assertion: Generally the path of a projectile from the earth is parabolic but it is elliptical for projectiles going to a very great height.
Reason: Up to ordinary height the projectile moves under a uniform gravitational force, but for great heights, projectile moves under a variable force.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Assertion: In javelin throw, the athlete throws the projectile at an angle slightly more than 45o.
Reason: The maximum range does not depend upon the angle of projection.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true and reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false
A body is projected horizontally with a velocity 4 m/sec. The velocity of the body after 0.7 seconds will be nearly ( Take g = 10 m/sec2 )
10 m/sec
9 m/sec
19 m/sec
11 m/sec
Assertion: When the velocity of projection of a body is made n times, its time of flight becomes n times.
Reason: Range of projectile does not depend on
the initial velocity of a body.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Which of the following velocity-time graphs shows a realistic situation for a body in motion?
At the uppermost point of a projectile, its velocity and acceleration are at an angle of
0°
90°
45°
180°
A lead shot of 1 mm diameter falls through a long column of glycerine. The variation of its velocity 'v' with distance covered is represented by
If vectors and are perpendicular to each other, then the positive value of a is
3
1
2
0
Certain neutron stars are believed to be rotating at about 1 rev/s. If such a star has a radius of 20 km, the acceleration of an object on the equator of the star will be
20 108 m/s2
8 105 m/s2
120 105 m/s2
4 108 m/s2
