Physics - Description of Motion in Two and three Dimension

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Question - 1

If \(\vec {A}, \vec B \ and \ \vec C\) represent vectors denoting the sides of a cube,the size of the cube is best given by

  • A \((\vec A \cdot \vec B ) \cdot \vec C\)
  • B \((\vec A \times \vec B ) \cdot \vec C\)
  • C \((\vec A \cdot \vec B ) \times \vec C\)
  • D \((\vec A \times \vec B ) \times \vec C\)

Question - 2

Choose the INCORRECT statement

  • A Three vectors of different magnitude can be combined to give zero resultant
  • B Two vectors of different magnitude can be combined to give zero resultant
  • C A quantity whose magnitude is zero can be a vector.
  • D Product of two vectors can be either a scalar or a vector

Question - 3

A boy is able to throw a stone vertically up to a height h.The maximum horizontal distance through which he can throw the stone is

  • A \(\frac{h}{2}\)
  • B \(\frac{3h}{2}\)
  • C h
  • D 2h

Question - 4

Consider the following option :
A body describing uniform circular motion experiences
A.normal acceleration
B.radial acceleration
C.tangential acceleration

  • A if A is correct only
  • B if A and B are correct only
  • C if A and C are correct only
  • D if B and C are correct only

Question - 5

The angular frequency of the minute hand of a clock is (in rad s-1)

  • A \(\frac{1}{60}\)
  • B \(\frac{\pi}{180}\)
  • C \(\frac{\pi}{60}\)
  • D \(\frac{\pi}{1800}\)

Question - 6

In the wheels of a rail train,flanges are essential to provide the carriages the necessary

  • A uniform velocity
  • B uniform acceleration
  • C centripetal force
  • D centrifugal force

Question - 7

A uniform circular motion by a body has

  • A uniform acceleration
  • B  A non- uniform acceleration
  • C a uniform tangential acceleration
  • D a uniform tangential velocity

Question - 8

Which of the statements given below are correct?
The statements :
A.The direction of the velocity of a body can change when its acceleration is constant.
B.A body can have a constant velocity and still have a varying speed.
C.A body can have a constant speed and still have a varying velocity.
D.A body can have zero velocity and still be acceleration.

  • A A and B only
  • B B and C only
  • C A,C and D only
  • D C and D only

Question - 9

An electric bulb hangs from the roof of a train by means of a thin flexible wire.As the train goes round curved path of radius \(41\sqrt(3)\) metres,the bulb shifts so that the wire makes an angle of 30° with the vertical.The speed of the train is approximately

  • A 20 ms-1
  • B 30 ms-1
  • C 40 ms-1
  • D 60 ms-1

Question - 10

A particle travels at constant speed,but with no restriction on its direction of motion.For this situation,the acceleration vector at any instant is

  • A always perpendicular to the velocity vector
  • B always in the direction of velocity vector
  • C always zero
  • D None of the above