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# Model Questions for Scientific Assistant (IMD) Exam (Paper-1) – Set 17

## 1. The Kelvin, the S.I. unit of thermodynamic temperature is defined as :

(a) one hundredth of the temperature difference between the triple-point of water and the steam­point
(b) one hundredth of the temperature-difference between the ice-point and the steam-point
(c) the fraction 1/273.16 of the thermodynamic temperature of the triple-point of water
(d) the fraction 1/373.15 of the thermodynamic temperature of the steam-point

## 2. Fish can survive inside a frozen lake because:

(a) Fish are cold-blooded animals
(b) Fish can breathe when embedded in ice
(c) Fish move to the bottom of the lake where the water is at 4°C and hence cannot freeze
(d) Fish move to the top of the take where the water is at 4°C and hence cannot freeze

## 3. What happens if water is cooled from 8°C to 0°C?

(a) its volume decreases uniformly, becoming minimum at 0°C
(b) its volume increases uniformly, becoming maximum at 0°C
(c) its volume decreases upto 4°C and then increases
(d) its volume increases upto 4°C and then decreases

## 4. When a ship floats on water—-

(a) it displaces no water
(b) the mass of water displaced is more than the mass of the ship
(c) the mass of the water displaced is equal to the mass of the ship
(d) the mass of water displaced is less than the ship

## 5. The passengers in a boat are not allowed to stand because :

(a) this will raise the centre of gravity and the boat be rocked
(b) this will lower centre of gravity and the boat will rocked
(c) the effective weight of system increases
(d) of surface tension effects

## 6. In high mountain regions bleeding through nose occurs because—-

(a) the pressure of the blood capillaries is higher than the outside pressure
(b) the pressure at high altitudes is greater than that of the plains
(c) the blood pressure increases at high altitudes
(d) the blood pressure fluctuates and causes the blood vessels to break

## 7. One litre of cool air weighs heavier then one litre of hot air because of the—-

(a) increased number of collisions between the molecules
(b) increased number of molecules at high temperature
(c) greater energy of molecules at high temperature
(d) lower energy of molecules at high temperature

## 8. Why does a liquid drop assuming a spherical shape ?

(a) because a sphere has the least surface for a given volume.
(b) because a sphere has the largest surface for a given volume surface tension.
(c) because intermolecular forces are strong in liquids.
(d) because intermolecular force are weak in liquids.

## 9. In which of the following example of motion, the body can he considered approximately, a point object :

(a) a railway carriage moving without jerks between two stations.
(b) a monkey sitting on top of a man cycling smoothly on a larger circular path.
(c) a spinning cricket hall that turns sharply on hitting the ground.
(d) both (a) and (b)

## 10. While running over a horizontal level road, the man holds the umbrella in the vertical direction. If he stops, then in order to protect himself from the rain he should hold it :

(a) still vertically
(b) inclined to the front
(c) inclined to the back
(d) at an angle of 45