Question
A bullet is fired from a rifle which recoils after
firing. The ratio of kinetic energy of the rifle to that of the bullet is –Solution
The rifle and bullet have zero momentum and zero kinetic energy to start with. When the trigger is pulled, the bullet gains some momentum in the forward direction, but this is canceled by the rifle's backward momentum, so the total momentum is still zero. The kinetic energies of the gun and bullet are both positive scalars, however, and do not cancel.
Four figures have been given, out of which three are alike in some manner and one is different. Select the one that is different.
By interchanging the given two signs which of the following equation will be correct?Â
× and ÷Â
I. 5 + 6 × 2 – 4 ÷ 1 = 10Â
In this figure, first figure is related to second figure following a certain pattern. Choose from among the alternatives, the figure pair, in which the ...
During lunch break, eight colleagues, namely A, B, C, D, E, F, G and H are sitting in a circle facing the centre at equal distances. B is an immediate n...
How many meaningful four-letter English words can be formed using the first, fourth, fifth and sixth letters of the word SAVOUR (when counted from left ...
P, Q, R, S, T, U, V, and W are sitting around a circle, facing the centre. P is third to the left of S. P is second to the right of T, who is an immedia...
Divya travels 15 km south, turns left and travels 40 km to reach at the college gate. She then turns right and travels 50 km. Finally, she turns right a...
In a certain code language, if ‘raghav plays hockey’ is written as ‘xfjdni rzzmo ubghzs’, then ‘arun works hard’ will be written as:
...In a certain code language, 'your attention please' is written as 'puw cuw zuw', 'kind attention' is written as 'muw zuw', and 'please pay attention' is...
Select the option that is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and th...
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