JEE Physics - Kinematics

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Question - 1

Identify the unit vector in the following?

  • A \(\hat { i } +\hat { j } \)
  • B \(\frac { \hat { i } }{ \sqrt { 2 } } \)
  • C \(\hat { k } -\frac { \hat { j } }{ \sqrt { 2 } } \)
  • D \(\frac { \hat { i } +\hat { j } }{ \sqrt { 2 } } \)

Question - 2

Which one of the following physical quantities cannot be represented by a scalar?

  • A Mass
  • B length
  • C momentum
  • D magnitude of acceleration

Question - 3

Two objects of masses m1 and m2 fall from the heights h1 and h2 respectively. The ratio of the magnitude of their momenta when they hit the ground is ________________.

  • A \(\sqrt { \frac { { h }_{ 1 } }{ { h }_{ 2 } } } \)
  • B \(\sqrt { \frac { { { m }_{ 1 }h }_{ 1 } }{ { { m }_{ 2 }h }_{ 2 } } } \)
  • C \(\frac { { m }_{ 1 } }{ { m }_{ 2 } } \sqrt { \frac { { h }_{ 1 } }{ { h }_{ 2 } } } \)
  • D \(\frac { { m }_{ 1 } }{ { m }_{ 2 } } \)

Question - 4

If a particle has negative velocity and negative acceleration, its speed _____________

  • A increases
  • B decreases
  • C remains same
  • D zero

Question - 5

If the velocity is \(\overrightarrow { v } =2\hat { i } +{ t }^{ 2 }\hat { j } -9\overrightarrow { k } \) then the magnitude of acceleration at t = 0.5s is ______________

  • A 1 ms-2
  • B 2 ms-2
  • C zero
  • D -1 ms-2

Question - 6

If an object is dropped from the top of a building and it reaches the ground at t = 4 s, then the height of the building is ____________ (ignoring air resistance) (g = 9.8 ms-2) 

  • A 77.3 m
  • B 78.4 m
  • C 80.5 m
  • D 79.2 m

Question - 7

A ball is projected vertically upwards with a velocity v. It comes back to ground in time t. Which v-t graph shows the motion correctly?

  • A
  • B
  • C
  • D

Question - 8

If one object is dropped vertically downward and another object is thrown horizontally from the same height, then the ratio of vertical distance covered by both objects at any instant t is ______________.

  • A 1
  • B 2
  • C 4
  • D 0.5

Question - 9

A ball is dropped from some height towards the ground. Which one of the following represents the correct motion of the ball?

  • A
  • B
  • C
  • D

Question - 10

If a particle executes uniform circular motion in the xy plane in clock wise direction, then the angular velocity is in

  • A +y direction
  • B +z direction
  • C -z direction
  • D -x direction
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