The force exerted by the floor of an elevator on the foot of a person standing there, is more than his weight, if the elevator is
(A) going down and slowing down.
(B) going up and speeding up.
(C) going up and slowing down.
(D) either (A) and (B).
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A mixture of CuS (molecular weight = `M_(1)`) and `Cu_(2)S` (molecular weight `=M_(2)`) is oxidised by `KMnO_(4)` (molecular weight `=M_(3)`) in acidi
Correct Answer - `(M_(1))/(6), (M_(2))/(8), (M_(3))/(5)`
2 Answers 1 views
10. Lymph differs from blood in possessing (1) More proteins and less waste products (2) Less proteins and more waste products (3) More proteins and more waste products (4) Less proteins and less waste products
(2) Less proteins and more waste products
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A straight highway leads to the foot of a tower. A man standing at the top of the tower observes a car at an angle of depression of `30o` , which is a
Correct Answer - `3` seconds
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From an inertial frame of reference, explain the apparent weight for a person standing in a lift having zero acceleration.
1. A passenger inside a lift experiences only two forces: Gravitational force mg directed vertically downwards and normal reaction force N directed vertically upwards, exerted by the floor of the lift. 2. As...
2 Answers 2 views
A person is standing on the bank of a river. A fish inside water will see the person to be
Correct option is A) taller
2 Answers 1 views
A person standing on the land appears taller than his actual height to a fish inside a pond
B) Both A and R are true and R is not the correct explanation of A
2 Answers 1 views
The force exerted by the earth on a ball is 8N. The force on the earth by the ball is
Correct option is B) 8N
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The force exerted by the earth on a ball is 8N. The force on the earth by the ball is
2 Answers
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The average weight of 5 packets is 24 kgs and the average weight of another 10 packets is 12 kgs, then average weight of 15 packets is ……………….
Correct option is (B) 16 Kgs Average weight of 15 packets \(=\frac{5\times24+10\times12}{15}\) \(=\frac{120+120}{15}\) \(=\frac{240}{15}\) = 16 kg
2 Answers 1 views