#### 11th Standard Physics Kinematics English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021

11th Standard

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Physics

Time : 00:20:00 Hrs
Total Marks : 20

20 x 1 = 20
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)

$\frac { \hat { i } +\hat { j } }{ \sqrt { 2 } }$

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

(a)

1 ms-2

(b)

2 ms-2

(c)

zero

(d)

-1 ms-2

3. 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)

4. 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)

5. Two objects are projected at angles 30° and 60° respectively with respect to the horizontal direction. The range of two objects are denoted as R30° and R60° Choose the correct relation from the following.

(a)

R30° =R6 ​​​​​​​

(b)

R30° =4R6

(c)

R30° =$\frac{R_{60°}}{2}$

(d)

R30° =2R6

6. The angle between A i +j and B = i - j is

(a)

45°

(b)

90°

(c)

-45°

(d)

180°

7. Consider the quantities pressure, power, energy, impulse, charge. Out of these, the only vector quantity is

(a)

pressure

(b)

power

(c)

impulse

(d)

charge

8. Distance is a scalar quantity and ______________ is a vector.

(a)

Speed

(b)

Length

(c)

Time

(d)

Displacement

9. Choose the motion in two dimension from the following.

(a)

Motion of a train along a straight railway track

(b)

An object falling freely under gravity close to the Earth.

(c)

A particle moving along a curved path in a plane.

(d)

Flying ofa kite on a windy day.

10. The displacement of particle is given by X = a$\frac{a_1t}{2}-\frac{2_2t^2}{3}$ What is its acceleration?

(a)

$\frac{2a_2}{3}$

(b)

$-\frac{2a_2}{3}$

(c)

a2

(d)

zero

11. A man should hold his umbrella with vertical, when rain falls vertically with velocity $\vec { { V }_{ R } }$ and man walks horizontally with velocity $\vec{{V}_{M}}$ is:

(a)

$tan^{-1}(\frac{\vec{V}_{M}}{\vec{V}_{R}})$

(b)

$tan^{-1}(\frac{\vec{V}_{R}}{\vec{V}_{M}})$

(c)

tan-1(VR)

(d)

tan-1(VM)

12. The maximum range of a gun of horizontal terrain is 16 km. If g = 10 ms2, then muzzle velocity of a shell must be:

(a)

160 ms-1

(b)

200 $\sqrt{2}$ ms-1

(c)

400 ms-1

(d)

800 ms-1

13. The path of the projectile, projected horizontally is:

(a)

hyperbola

(b)

parabola

(c)

straight line

(d)

circle

14. A person performing a somersault is an example of__________motion.

(a)

circular

(b)

vibratory

(c)

linear

(d)

rotational

15. Resultant of the 2 vector is maximum when angle between them is:

(a)

90°

(b)

180°

(c)

(d)

270°

16. The dot product of two vectors is:

(a)

commutative

(b)

associative

(c)

unit-commutative

(d)

none of the three

17. If for two vectors $\bar A,\bar B$ $\bar A\times\bar B=0$ then the vectors are:

(a)

perpendicular to each other

(b)

parallel to each other

(c)

act at an angle 60°

(d)

act at an angle 30°

18. Two vectors $\bar A$ and $\bar B$ are such that $\bar A \times\bar B=\bar C$ and A = B = C then angle between  $\bar A$ and $\bar B$ is:

(a)

120°

(b)

90°

(c)

60°

(d)

30°

19. The expression for time of flight of a projectile is tf = :

(a)

$\frac{\sin\theta}{g}$

(b)

$\frac{u\sin\theta}{g}$

(c)

$\frac{u\sin\theta}{2g}$

(d)

$\frac{2u\sin\theta}{2g}$

20. During a projectile motion if the maximum height equals the horizontal range, then the angle of projection with the horizontal is:

(a)

tan-1(1)

(b)

tan-1(2)

(c)

tan-1(3)

(d)

tan-1(4)