General-Studies Quiz For FCI Phase I 2022- 14th October

Q1. Which one of the following physical quantities is the same for molecules of all gases at a given temperature?
(a) Speed
(b) Mass
(c) Kinetic energy
(d) Momentum
(e) None of the above

Q2. Newton’s laws of motion do not hold good for objects
(a) at rest
(b) moving slowly
(c) moving with high velocity
(d) moving with velocity comparable to velocity of light
(e) None of the above

Q3. With the rise of temperature, the viscosity of liquid –
(a) Increases
(b) Decreases
(c) Remains unchanged
(d) May increase or decrease depending on nature of liquid
(e) None of the above

Q4. Which pair of following is of Copper alloys?
(a) Brass and invar
(b) Bronze and Nichrome
(c) Brass and Bronze
(d) None of the above
(e) None of the above

Q5. Bar is a unit of which one of the following?
(a) Force
(b) Energy
(c) Pressure
(d) Frequency
(e) None of the above

Q6. On which one of the following conservative laws, does a rocket work?
(a) Mass
(b) Energy
(c) Linear momentum
(d) Angular momentum
(e) None of the above

Q7. If a small raindrop falls through air
(a) its velocity goes on increasing
(b) its velocity goes on decreasing
(c) its velocity goes on increasing for sometime and then becomes constant
(d) it falls with constant speed for sometime and then its velocity increases
(e) None of the above

Q8. An athlete diving off a high springboard can perform a variety of exercises in the air before entering the water below. Which one of the following parameters will remain constant during the fall?
(a) The athlete’s linear momentum
(b) The athlete’s moment of inertia
(c) The athlete’s kinetic energy
(d) The athlete’s angular momentum
(e) None of the above

Q9. The force acting on a particle executing simple harmonic motion is
(a) directly proportional to the displacement and is directed away from the mean position
(b) inversely proportional to the displacement and is directed towards the mean position
(c) directly proportional to the displacement and is directed towards the mean position
(d) inversely proportional to the displacement and is directed away from the mean position
(e) None of the above

Q10. When a ball drops onto the floor it bounces. Why does it bounce?
(a) Newton’s third law implies that for every action (drop) there is a reaction (bounce)
(b) The floor exerts a force on the ball during the impact
(c) The floor is perfectly rigid
(d) The floor heats up on impact
(e) None of the above

Solutions

S1.Ans. (c)
Sol. Kinetic energy is the same for molecules of all gases at a given temperature.

S2.Ans. (d)
Sol. Newton’s laws of motion do not hold good for objects moving with velocity comparable to velocity of light because it does not follow it on this level.

S3.Ans. (b)
Sol. The viscosity of the liquid tends to decrease with the increase in temperature. The temperature effect on viscosity is different for liquid and gases.

S4.Ans. (c)
Sol. Brass and Bronze are metal alloys of copper. Brass is a metal alloy of copper and zinc, while Bronze is an alloy of copper and tin.

S5.Ans. (c)
Sol. 1 Bar = 105 Pa. Both bar and Pa are the unit of pressure.

S6.Ans. (c)
Sol. Rocket works on the principle of conservation of linear momentum.

S7.Ans. (c)
Sol. Velocity of raindrop increases until it reaches the terminal velocity.

S8.Ans. (d)
Sol. When a athlete jumps from the spring board, he curls his body by rolling his arms and legs in. By doing so, he decreases moment of inertia of his body and hence angular speed increases to conserve the angular momentum, as I1 w1 = I2 w2 = constant.

S9.Ans. (c)
Sol. The restoring force acting on the particle is always proportional to the displacement of the particle from the equilibrium position and is always directed towards the equilibrium position.

S10.Ans. (b)
Sol. When a ball drops on to the floor then floor exerts a force for small time which is equal to change in momentum of the ball.