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Description: Physics test 3
Number of Questions: 25
Created by:
Tags: Physics test 3 Viscosity (Poiseuille s Equation Excluded) Coefficient of Viscosity Dynamics of Particle Laws of Motion Surface Energy and Surface Tension Newton s Laws of Motion Kinematic Equations Applications of Kinematic Equations of Motion Mechanics Motion in a Plane
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Fat can be separated from milk in a cream-separator because of

  1. cohesive force

  2. gravitational force

  3. centrifugal force

  4. centripetal force

Show answer
Correct Option: C

When a camel hair brush is dipped in water, the hair get separated but when it is removed from water the hair are found to be drawn together. This is due to

  1. viscosity

  2. surface tension

  3. osmosis

  4. elasticity

Show answer
Correct Option: B

The property of a liquid by virtue of which it can oppose the relative motion between its different layers is

  1. surface tension

  2. viscosity

  3. osmosis

  4. diffusion

Show answer
Correct Option: B
Explanation:

Viscosity describes a fluid's internal resistance to flow and may be thought of as a measure of fluid friction. For example, high-viscosity folic magma will create a tall, steep strata volcano, because it cannot flow far before it cools, while low-viscosity manic lava will create a wide, shallow-sloped shield volcano. All real fluids (except super fluids) have some resistance to stress and therefore are viscous, but a fluid which has no resistance to shear stress is known as an ideal fluid or in viscid fluid.

Electrons revolve round the nucleus because of

  1. cohesive force

  2. adhesive force

  3. centripetal force

  4. centrifugal force

Show answer
Correct Option: C
Explanation:

Rutherford assumed that electrons are revolving around the nucleus in circular orbits of all possible redii. The necessary centripetal forces for circular motion of electrons around the nucleus is provided by electrostatic force of attraction between electrons and nucleus. So 3rd option is the correct answer.

An object dropped from the top of a tower reaches the ground after 8 seconds. How high is the tower?

  1. 64 ft.

  2. 128 ft.

  3. 256 ft.

  4. 1024 ft.

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Correct Option: D

A 5 kg object attached to a nylon cord outside a space vehicle is traveling in a circular orbit of 10 m radius with a speed of 4 m/s. What is the force acting on the cord?

  1. 2 N

  2. 4 N

  3. 6 N

  4. 8 N

Show answer
Correct Option: D

Two forces of 14 N and 16 N on the same plane are acting on an object to produce a resultant force of 2 N. What is the orientation of the forces with respect to each other?

  1. 45o

  2. 90o

  3. 180o

  4. 270o

Show answer
Correct Option: C

A car and a lorry both are moving with equal kinetic energies. If an equal breaking force is applied on both, then before coming to rest

  1. the car will cover a greater distance

  2. the lorry will cover a greater distance

  3. both will cover the same distance

  4. the distance covered by them will depend only on their respective velocities

Show answer
Correct Option: C

Where should the centre of gravity of a body lie?

  1. It must lie within the body

  2. It must be near but not essentially within the body

  3. It may change its position from time to time

  4. It must be outside the body

Show answer
Correct Option: C

The acceleration of a body moving in a circular path at uniform speed is

  1. directed away from the centre

  2. directed towards the centre

  3. directed tangentially

  4. zero

Show answer
Correct Option: B

A bottle of soda water is grasped by the neck and swung briskly in a vertical circle. The bubbles collect

  1. near the bottom of the bottle

  2. in the middle of the bottle

  3. near the neck of the bottle

  4. uniformly all over the bottle

Show answer
Correct Option: C

When a body moves with a constant speed along a circle, then

  1. no work is done

  2. no acceleration is produced in the body

  3. no force acts on the body

  4. its velocity remains constant

Show answer
Correct Option: A
Explanation:

Since force and displacement vector are perpendicular to each other when a body is moving in a circular path, so work done is 0 since we know that work done is the dot product of force applied and displacement of the particle.

Directions: There are two statements, one labeled the Assertion (A) and the other labeled the Reason (R). Examine the statements and decide if the Assertion A and Reason R are individually true and if so, whether the reason is the correct explanation of the assertion. Select your answers to the question from the codes given below:

Assertion (A): A particle moving in a uniform circular motion has uniform velocity. Reason (R): The particle has a uniform speed.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true and R is not the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true

Show answer
Correct Option: D

A projectile is thrown horizontally from the top of a tower 100 m high. Neglecting the air resistance, the path traced by the projectile will be

  1. a straight line

  2. a parabola

  3. a hyperbola

  4. an ellipse

Show answer
Correct Option: B
Explanation:

Path followed by a projectile is a parabolic path, so 2nd option is the correct answer.

Directions: There are two statements, one labeled the Assertion (A) and the other labeled the Reason (R). Examine the statements and decide if the Assertion A and Reason R are individually true and if so, whether the reason is the correct explanation of the assertion. Select your answers to the question from the codes given below:

Assertion (A): The acceleration due to gravity decreases with height above the earth's surface. Reason (R): Gravitational force increases with height.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true and R is not the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true

Show answer
Correct Option: C

Directions: There are two statements, one labeled the Assertion (A) and the other labeled the Reason (R). Examine the statements and decide if the Assertion A and Reason R are individually true and if so, whether the reason is the correct explanation of the assertion. Select your answers to the question from the codes given below:

Assertion (A): Objects appear 'weightless' inside an orbiting spacecraft. Reason (R): Objects in circular motion experience centripetal force.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true but R is not the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true

Show answer
Correct Option: B

Directions: There are two statements, one labeled the Assertion (A) and the other labeled the Reason (R). Examine the statements and decide if the Assertion A and Reason R are individually true and if so, whether the reason is the correct explanation of the assertion. Select your answers to the question from the codes given below:

Assertion (A): Isotopes can be used as tracer elements. Reason (R): They are effective even when introduced in small amounts.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true and R is not the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true

Show answer
Correct Option: A

Directions: There are two statements, one labeled the Assertion (A) and the other labeled the Reason (R). Examine the statements and decide if the Assertion A and Reason R are individually true and if so, whether the reason is the correct explanation of the assertion. Select your answers to the question from the codes given below:

Assertion (A): Ventilators should always be provided near ceilings. Reason (R): Fresh air becomes warmer when polluted.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true and R is not the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true

Show answer
Correct Option: A

Directions: There are two statements, one labeled the Assertion (A) and the other labeled the Reason (R). Examine the statements and decide if the Assertion A and Reason R are individually true and if so, whether the reason is the correct explanation of the assertion. Select your answers to the question from the codes given below:

Assertion (A): Car drivers are advised to remain inside the car during a thunderstorm. Reason (R): During any chance of lightning striking on the car, the charge will remain on the car surface and pass on to the earth through the lowest metallic part of the car.

  1. Both A and R are true and R is the correct explanation of A

  2. Both A and R are true and R is not the correct explanation of A

  3. A is true but R is false

  4. A is false but R is true

Show answer
Correct Option: A

Choose the correct statement from amongst the following for translatory motion

  1. Only a particle can have a translatory motion

  2. Only regular shaped bodies may have translatory motion

  3. Any finite size body may have translatory motion

  4. All the above

Show answer
Correct Option: C

Directions: There are two statements, one labeled the Assertion (A) and the other labeled the Reason (R). Examine the statements and decide if the Assertion A and Reason R are individually true and if so, whether the reason is the correct explanation of the assertion. Select your answers to the question from the codes given below:

Assertion (A): The gravitational force acting on a planet revolving around the sun does not work on the planet. Reason (R): The force is always at right angles to the direction in which the body is moving.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true and R is not the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true

Show answer
Correct Option: D

Directions: There are two statements, one labeled the Assertion (A) and the other labeled the Reason (R). Examine the statements and decide if the Assertion A and Reason R are individually true and if so, whether the reason is the correct explanation of the assertion. Select your answers to the question from the codes given below:

Assertion (A): Even though atmospheric pressure is great, we do not feel it at all. Reason (R): Our lungs and blood vessels are full of air at atmospheric pressure.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true and R is not the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true

Show answer
Correct Option: A

Choose the most appropriate statement for a particle body

  1. A particle is a point size body

  2. A particle body has no dimensions

  3. Two bodies are considered as particles if the distance between them is very large compared to their dimensions

  4. In translatory motion, any body of finite size may be considered as a particle

Show answer
Correct Option: D

Directions: There are two statements, one labeled the Assertion (A) and the other labeled the Reason (R). Examine the statements and decide if the Assertion A and Reason R are individually true and if so, whether the reason is the correct explanation of the assertion. Select your answers to the question from the codes given below:

Assertion (A): It is easier to swim in sea water than in the river water. Reason (R): Sea water is heavier and the immersed portion of the body experiences a greater upward thrust.

  1. Both A and R are true and R is the correct explanation of A

  2. Both A and R are true and R is not the correct explanation of A

  3. A is true but R is false

  4. A is false but R is true

Show answer
Correct Option: A

While running on a horizontal level road, a man holds an umbrella in the direction of the rain. If he stops, then in order to protect himself from the rain, he should hold it

  1. vertically as before

  2. inclined to the front

  3. inclined to the back

  4. at an angle of 45o

Show answer
Correct Option: C
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