Tag: physics

Questions Related to physics

An object is placed at a distance of $50\ cm$ from a convex mirror. A plane mirror is placed in front of the convex mirror in such a way that it covers half of the convex mirror. If the distance between object and plane mirror is $30\ cm$ then there is no parallax between the images formed by two mirrors, the radius of curvature of convex mirror will be :

physics reflection of light in spherical mirrors focus and focal length spherical mirror formula and magnification reflection of light by curved surfaces

  1. $50\ cm$

  2. $25\ cm$

  3. $12.5\ cm$

  4. $100\ cm$

Show answer
Correct Option: A

The ratio of inertial force to viscous force represents

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. Magnus effect

  2. Reynolds number

  3. Torricelli's law

  4. Relative density

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Correct Option: B
Explanation:

Reynolds number represents the ratio of inertial force to viscous force.

Inertia of a body has direct dependence on :

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. Velocity

  2. Volume

  3. Mass

  4. Density

Show answer
Correct Option: C
Explanation:

Mass is called as transnational inertia of body.

More mass means more force is required to change its state.
So option C is correct. 

A tennis ball and a cricket ball, both are stationary. To start motion in them

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. a less force is required for the cricket ball than for the tennis ball

  2. a less force is required for the tennis ball than for the cricket ball

  3. same force is required for both the balls

  4. nothing can be said

Show answer
Correct Option: B
Explanation:

According to Newton's laws of motion, an object with more mass requires more force to change the current state. Since, a cricket ball is heavier than a tennis ball, therefore, less force is required to start motion in tennis ball than in cricket ball.

The tendency of a body to resist acceleration is called:

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. Force

  2. Retardation

  3. Inertia

  4. mass

Show answer
Correct Option: C
Explanation:

Inertia is the resistance of any physical object to any change in its state of motion, including changes to its speed and direction. It is the tendency of objects to keep moving in a straight line at constant velocity.

The term mass refers to the same physical concept as:

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. weight

  2. inertia

  3. force

  4. acceleration

Show answer
Correct Option: B
Explanation:

The mass can be described as inertia of object which resist its changes in state of motion and rest. Hence correct answer is B.

The mass of an object is a $\underline{                     }$ measure of inertia:

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. quantitative

  2. qualitative

  3. absolute

  4. average

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Correct Option: A
Explanation:

The tendency of an object to resist changes in its state of motion varies with mass. Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has. A more massive object has a greater tendency to resist changes in its state of motion.

Who proposed the concept of Inertia ? 

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. Gallileo

  2. Newton

  3. Pascal

  4. Einstein

Show answer
Correct Option: A
Explanation:

Galileo Galilei first proposed the concept of inertia. Inertia is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.

Inertia of a body depends on:

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. Mass of the body

  2. Velocity of the body

  3. Acceleration of the body

  4. Energy of the body

Show answer
Correct Option: A
Explanation:

Factors on which inertia of a body depend are:
(1) Mass
(2) Axis of rotation

State whether given statement is True or False.
A five rupees coin has more inertia than a one-rupee coin.

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Mass of a body is the measure of its inertia i.e., more the mass, more is the inertia. Keeping this in mind:
Five rupees coin has more inertia.