A physical quantity A is related to four observables a, b, c and d as follows :
. The percentage errors of measurement in a, b, c and d are 1%, 3%, 2% and 2% respectively. What is the percentage error in the quantity A ?
12 %
7 %
5 %
14 %
A body starting from rest moves with constant acceleration. The ratio of distance covered by the body during the 5th second to that covered in 5 s is
The area under acceleration-time graph gives
distance travelled
change in acceleration
force acting
change in velocity
A particle is displaced from a position to another position under the action of the force of . The work done by the force in an arbitrary unit is
8
10
12
16
From the top of tower, a stone is thrown up. It reaches the ground in t1 second. A second stone thrown down with the same speed reaches theground in t2 second. A third stone released from rest reaches the ground in t3 second. Then
An object is projected at an angle of 45° with the horizontal. The horizontal range and maximum height reached will be in the ratio
1 : 2
2 : 1
1 : 4
4 : 1
D.
4 : 1
If the length of the second's hand in a stop-clock is 3 cm, the angular velocity and linear velocity of the tip is
0.2047 rad/s , 0.0314 ms-1
0.2547 rad/s , 0.314 ms-1
0.1472 rad/s , 0.06314 ms-1
0.1047 rad/s , 0.00314 ms-1
A player caught a cricket ball of mass 150 g moving at the rate of 20 ms-1 . If the catching process be completed in 0.1 s, the force of the blow exerted by the ball on the hands of the player is
0.3 N
30 N
300 N
3000 N
A uniform metal chain is placed on a rough table such that one end of it hangs down over the edge of the table. When one-third of its length hangs over the edge, the chain starts sliding. Then, the coefficient of static friction is