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

11th Standard

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Physics

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

25 x 1 = 25
1. Which one of the following Cartesian coordinate systems is not followed in physics?

(a)

(b)

(c)

(d)

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

(a)

Mass

(b)

length

(c)

momentum

(d)

magnitude of acceleration

3. 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

4. An object is dropped in an unknown planet from height 50 m, it reaches the ground in 2 s . The acceleration due to gravity in this unknown planet is

(a)

g=20 ms-2

(b)

g=25 ms-2

(c)

g=15 ms-2

(d)

g=30 ms-2

5. The component of position vector $\overrightarrow { r }$ along x-axis will maximum value if

(a)

$\overrightarrow { r }$ is along the x - axis

(b)

$\overrightarrow { r }$ makes an angle of 45° with x - axis

(c)

$\overrightarrow { r }$  is along the y - axis

(d)

$\overrightarrow { r }$  is along - ve y - axis

6. The length of a vector is _______________

(a)

always a negative quantity

(b)

always a positive quantity

(c)

either positive or negative

(d)

denoted by '$\lambda$

7. A particle moves with uniform velocity. Which of the following statements about the motion of the particle is true?

(a)

Its speed is zero

(b)

Its acceleration is zero

(c)

Its acceleration is opposite to the velocity

(d)

Its speed may be variable

8. The slope of the velocity-time graph for retarded motion is:

(a)

positive

(b)

negative

(c)

zero

(d)

can be positive, negative or zero

9. Two projectiles P and Q are fired from 'the same point with same velocity at angles 30° and 60°. The horizontal range of:

(a)

P is equal to Q

(b)

P is less than Q

(c)

P is greater than Q

(d)

none of the above

10. The angle of projection for a projectile to cover maximum range is:

(a)

30°

(b)

60°

(c)

(d)

45°

11. Length of the vector is always__________quantity.

(a)

negative

(b)

positive

(c)

unit

(d)

zero

12. What is the resultant vectors, when 2 vectors are at right angles to each other?

(a)

$R=\sqrt{P^2+Q^2}$

(b)

R=P+ Q

(c)

R=P-Q

(d)

$R=\sqrt \frac{P}{Q}$

13. Two vectors act along the mutually perpendicular directions are called______vectors.

(a)

equal

(b)

opposite

(c)

orthogonal

(d)

orthogonal unit

14. $\vec A$and $\vec B$ are perpendicular if $\vec A$· $\vec B$ = :

(a)

1

(b)

0

(c)

$\infty$

(d)

$\frac {\vec A}{\vec B}$

15. The parallelogram law of vector addition is equivalent to___________method.

(a)

polygon

(b)

coplanar

(c)

triangle

(d)

collinear

16. Which of the following statements is/are not true?

(a)

v, a and s are vectors

(b)

Mass, energy, work are vectors

(c)

Vector has only magnitude whereas scalar has both magnitude and direction

(d)

both (b) and (c)

17. If $\bar A$and $\bar B$ are two vectors which of the statement is wrong?

(a)

$\bar A+\bar B=\bar B+\bar A$

(b)

$\bar A-\bar B=-(\bar B+\bar A)$

(c)

$\bar A\times\bar B=\bar B\times\bar A$

(d)

$\bar A.\bar B=\bar B.\bar A$

18. It is found that $\left|A+B\right|=\left|A\right|.$ This necessarily implies

(a)

B=0

(b)

A, B are anti-parallel

(c)

A, B are perpendicular

(d)

$A,B\le 0$

19. The equation y = $\frac{8}{2u^2}x^2$ represents:

(a)

the path of a freely falling body

(b)

the path of a thrown bodies

(c)

the path of a projectile

(d)

hyperbola

20. The angular speed of a fly-wheel making 120 revolutions/minute is:

(a)

$\pi$ rad/sec

(b)

$4\pi$ rad/sec

(c)

$2\pi$ rad/sec

(d)

$4\pi^2$ rad/sec

21. What is the ratio of the angular speeds of the minute hand and second-hand of a clock?

(a)

1: 12

(b)

12: 1

(c)

1: 60

(d)

60: 1

(a)

$v\omega^2$

(b)

$r\omega$

(c)

$r^2\omega$

(d)

$r\omega^2$

23. If $\omega_0,\omega$ are initial and final angular velocities, $\theta$ is the angular displacement and a. is the angular acceleration then.

(a)

$\omega^2=\omega_0^2-2\alpha\theta$

(b)

$\omega_0^2=\omega^2-2\alpha\theta$

(c)

$\omega_0^2=\omega^2+2\alpha\theta$

(d)

$\omega^2=\omega_0^2+2\alpha\theta$

24. In which direction of the motion of the particle does centripetal force act?

(a)

parallel

(b)

(c)

tangential

(d)

right angle

25. A butterfly and stone (mass of later is greater than earlier) is moving with same velocity. Momentum of the stone is .......... than the momentum of butterfly.

(a)

equal

(b)

greater

(c)

lesser

(d)

lesser (or) equal to