Tag: physics

Questions Related to physics

Electric drill, rolling ball, wheel of a moving car, pendulum of a wall clock,spinning ball. Find the odd one out.

physics kinematics motion around us motion and rest moving things around us

  1. pendulum of a wall clock

  2. Electric drill

  3. wheel of a moving car

  4. spinning ball

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Correct Option: A
Explanation:

Pendulum of a wall clock- It is in periodic motion. Rest all are in multiple motion. The restoring force is proportional to displacement .While electric drill, rolling ball etc are in multiple motion like rotational +transnational or Vibrational motion.

Apple falling from a tree, car moving on a straight road, coins moving over a carrom board, giant wheel. Find the odd one out:

physics kinematics motion around us motion and rest moving things around us

  1. gaint wheel

  2. Apple falling from a tree

  3.  car moving on a straight road

  4. coins moving over a carrom board

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Correct Option: A
Explanation:

Giant wheel- because it has rotational motion as well as transnational motion. While apple falling from a tree, a car moving on straight rod and coin moving over a carrom board have only linear or rectilinear motion.  

Find the odd one out.
Table, chair, tree, moon

physics kinematics motion around us motion and rest moving things around us

  1. moon

  2. chair 

  3. tree

  4. table

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Correct Option: A
Explanation:

Moon 

When the position of a body does not change with respect its surroundings and time the body is said to be in rest.
But moon is in motion with respect to earth while other object like book ,table and tree are in rest with respect to earth . When these object are viewed from other planet ,then they will appear moving with earth velocity.  

Tree, hut, earth, dustbin, chair. Find the odd one out.

physics kinematics motion around us motion and rest moving things around us

  1. earth

  2. Tree

  3. dustbin

  4. chair

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Correct Option: A
Explanation:

Earth, because earth is in motion while other object are in rest with respect to earth.  

Select the odd one :

Bouncing ball, spinning top, oscillating pendulum, study table

physics kinematics motion around us motion and rest moving things around us

  1. study table

  2. bouncing ball

  3. spinning top

  4. oscillating pendulum

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Correct Option: A
Explanation:

All the three object are in any osscilatory motion wrt to earth as frame of refrence. But study table is at rest.

So study table is odd one out of the four objects.

Two balls of different masses have the same KE. Then the: 

physics kinematics motion around us motion and rest moving things around us

  1. Heavier ball has greater momentum than the lighter ball.

  2. Lighter Will has greater momentum than the heavier ball.

  3. Both bans have equal momentum.

  4. Both balls have zero momentum.

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Correct Option: A
Explanation:

The relation between kinetic energy $(K)$ and momentum $(p)$ is given by, $K=\dfrac{p^2}{2m}$ where $m$ be the mass of the body

So, $p=\sqrt{2mK}$
As kinetic energy is constant, so $p\propto \sqrt m$
Thus, the heavier ball has more momentum than that of lighter ball. 

When a body is at rest, it is obeying

physics kinematics motion around us motion and rest moving things around us

  1. Principle of conservation of energy

  2. Principle of moments

  3. Newton's first law

  4. Newton's second law

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Correct Option: C
Explanation:
Inertia is the tendency of an object to remain at rest or in motion. Newton's First Law of Motion states that an object will remain at rest or move at a constant speed in a straight line unless it is acted on by an unbalanced force.
So, when a body is at rest, it is obeying Newton's first law or motion or law of inertia. 

An object is said to be in motion its position (with respect to another object)

physics kinematics motion around us motion and rest moving things around us

  1. changes with time

  2. does not change with time

  3. does not change

  4. is the same as before

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Correct Option: A
Explanation:

Changes with time

What is corrct statement about impulse?

physics along with motion motion around us motion and rest moving things around us

  1. change in velocity

  2. change in momentum due to force in small time

  3. change in acceleration

  4. change in speed

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Correct Option: B
Explanation:

Impulse:- It is defined as a change in momentum due to force in small time.

Mathematically, 
From Newton's law,
$F=\dfrac{\Delta p}{\Delta t}$
Impulse, $I=F\times \Delta t=\Delta P$
The correct option is B.

A train of length 200 m traveling at $30 { ms }^{ -1 }$ overtakes another train of length 300 m traveling at $20 { ms }^{ -1 }$. The time taken by the first train to pass the second is 

physics along with motion motion around us motion and rest moving things around us

  1. 10 s

  2. 30 s

  3. 40 s

  4. 50 s

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Correct Option: D