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CBSE Physics MCQ for quick revision – Mechanics

  • If the object is in equilibrium, the sum of all the forces acting on the object is zero.
    1. Inertia
    2. Force
    3. Mechanical Equilibrium
    4. Equilibrium rule

 

  • A push or a pull on an object.
    1. Inertia
    2. Force
    3. Mechanical Equilibrium
    4. Equilibrium rule

 

  • The tendency of objects to resist changes in motion.
    1. Inertia
    2. Force
    3. Mechanical Equilibrium
    4. Equilibrium rule

 

  • An object is in a state where there is no change in motion.
    1. Inertia
    2. Force
    3. Mechanical Equilibrium
    4. Equilibrium rule
  • How fast an object is moving, and in what direction.
    1. Speed
    2. Velocity
    3. Acceleration
    4. Free fall
  • How fast an object is moving, without consideration of direction.
    1. Speed
    2. Velocity
    3. Acceleration
    4. Free fall
  • An object is falling under the influence of gravity, and with no air-resistance.
    1. Speed
    2. Velocity
    3. Acceleration
    4. Free fall
  • The rate at which velocity is changing with time.
    1. Speed
    2. Velocity
    3. Acceleration
    4. Free fall

 

Why direct currents aren’t used in Home circuits?

How can an alternating current change its direction while moving in a wire or any conductor? Why direct currents aren’t used in Home circuits?
RAHUL ASKED
Answer:
Alternating current is produced by rotating a coil in a strong magnetic field (or by rotating magnet around the coil)
So, during every half rotation the direction of emf (voltage) induced in the […]


Jaz posted this question from electrostatics

“I’ve tried so many times, but I’m unable to arrive at the correct equation; See attachment for question” Question   Jaz posted this question E=k(2λ/r) due to positive wire E’=k(2λ/(D-r)) due to negative wire The resultant will be the sum of these as both are in the same direction At the mid point both distances are r = […]

More problems coming in; Try to answer now!

Stuti posted these:
a particle is thrown with  any velocity vertically upward. the distance traveled by particle in last sec of ascent is 1)g 2)g/2 3)g/4 4)cant be calculated
a ball is dropped from a bridge of 122.5 metre above a river. after ball has been falling for 2 sec,a second ball is thrown straight down after it. initial […]


Homework from vectors

A man walks 10 km towards west and then 12 km (60 degree_ direction of North-East. find the resultant vectors, magnitude and direction. A man walks 10 km towards west and then 15 km towards south. Find the resultant vectors, magnitude and direction. Justify and comments either quantity scalar or vector. Weight Temperature Velocity Work Distance Speed […]

Direction of magnetic field due to a current carrying conductor

“How do we know the direction of magnetic field around the current carrying conductor?” Asked Nikhil

Incoming search terms:

  • direction of magnetic field around a current carrying conductor
  • DIRECTION OF MAGNETIC FIELD IN CURRENT CARRYING CONDUCTOR
  • magnetic field due to current in magnetic field


Why gravitational force of attraction is necessary for a satellite to revolve around earth?

The question was posted by Raj Kumar.

The satellite has a velocity. To revolve around, the direction of velocity must change. In the absence of a force it can move only in a straight line. It is the gravitational force which helps the satellite top change direction and revolve around the earth.

In other words, for a satellite to revolve in a circular path, a centripetal force is required. This centripetal force is provided by the force of gravitation only.

Incoming search terms:

  • centroid of gravitational force


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