Question : Which among the following organs in the human body is most affected by Pneumonia disease?

Option 1: Kidneys

Option 2: Urinary bladder

Option 3: Heart

Option 4: Lungs

Question : An oil drop spreads over water because:

Option 1: oil is lighter than water.

Option 2: oil is more viscous.

Option 3: oil does not mix with water.

Option 4: surface tension of oils is much smaller than that of water.

Question : A man can swim at a speed of 14 km/hr in still water. If he takes twice the time as long to swim opposite the flow of the river than with the flow of the river, find the rate of the stream in km/hr.

Option 1: $\frac{14}{5}$

Option 2: $\frac{11}{5}$

Option 3: $\frac{11}{4}$

Option 4: $\frac{14}{3}$

Question : A boy can swim in still water at a speed of 40 km/hr. If the speed of the current would have been 15 km/hr, then find the time in which the boy could swim 25 km upstream.

Option 1: 2 hours

Option 2: 2.5 hours

Option 3: 1 hour

Option 4: 3 hours

Question : If action and reaction were to act on the same body, _________.

Option 1: the result will be zero

Option 2: the body would not move at all

Option 3: the body will start moving

Option 4: Only (A) and (B) are correct