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

11th Standard

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Physics

Time : 00:25:00 Hrs
Total Marks : 25

25 x 1 = 25
1. If $\pi=3.14,$ then the value of ${\pi}^{2}$ is

(a)

9.8596

(b)

9.860

(c)

9.86

(d)

9.9

2. Which unit is used to measure size of a nucleus?

(a)

Angstrom

(b)

Micron

(c)

Nano

(d)

Fermi

3. A student measures the distance traversed in free fall of a body, initially at rest, in a given time, He uses this data to estimate g, the acceleration due to gravity, If the maximum percentage errors in measurement of the distance and the time are e1 and e2 respectively, the percentage error in the estimation of g is

(a)

e2-e1

(b)

e1+2e2

(c)

e1+e2

(d)

e1-2e2

4. In a vernier caliper, n divisions of vernier scale coincides with (n - 1) divisions of main scale. The least count of the instrument is ______________

(a)

${1\over n}MSD$

(b)

${n\over n+1}MSD$

(c)

${ n+1\over n}MSD$

(d)

${ n+1\over n-1}MSD$

5. 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

6. If $\bar A$and $\bar B$ denotes the sides of a parallelogram whose area is $\frac{1}{1}\left| A \right|\left| B \right|$ the angle between $\bar A$and $\bar B$ is:

(a)

60°

(b)

450

(c)

30°

(d)

90°

7. If the length of the second hand in a stop clock is 3cm. The angular velocity and linear velocity of the tip is:

(a)

(b)

(c)

(d)

8. 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

9. If the coordinate axes (x, y, z) are drawn in anticlockwise direction then the co-ordinate system is known as

(a)

Cartesian coordinate system

(b)

right-handed coordinate system

(c)

left-handed coordinate system

(d)

cylindrical coordinate system

10. One radian is equal to

(a)

$\frac{\pi}{180}$ degree

(b)

60o

(c)

57.295o

(d)

53.925o

11. An object is dropped from rest. Its v - t graph is

(a)

(b)

(c)

(d)

12. Which of the following graph represents the equation y = mx?

(a)

(b)

(c)

(d)

13. A ball is thrown vertically upward. It is a speed of 10 m/s. When it has reached one half of its maximum height. How high does the ball rise? (g = 10 ms-2)

(a)

7 m

(b)

10 m

(c)

12 m

14. Momentum is closely related to

(a)

Force

(b)

Impulse

(c)

Velocity

(d)

K.E

15. A rocket with a lift off mass 2.5 $\times$ 104kg is blast upward with an initial acceleration of 5m/s2Then the initial thrust of the blast is

(a)

1.75 $\times$105N

(b)

7 $\times$105N

(c)

37.5$\times$ 105N

(d)

14 $\times$105N

16. How many degrees make a one newton?

(a)

102 dyne

(b)

202 dyne

(c)

105 dyne

(d)

205 dyne

17. Which law gives a method of measuring force?

(a)

Newton's first law of motion

(b)

Newton's second law of motion

(c)

Newton's third law of motion

(d)

None

18. Two blocks m1 = 5gm and m2 = 10gm are hung vertically over a light frictionless pulley as shown here. What is the acceleration of the masses when they are left free? (where g is acceleration due to gravity)

(a)

$\frac { g }{ 3 }$.

(b)

$\frac { g }{ 2 }$

(c)

g

(d)

$\frac { g }{ 5 }$

19. According to the conservation of linear momentum

(a)

momentum before impact = momentum after impact

(b)

momentum before impact > momentum after impact

(c)

momemtum before impact < momentum after impact

(d)

momentum before impact is inversely proportional to momentum after impact

20. Which of the following is the dimension of coefficient of friction?

(a)

[MLT-2]

(b)

[M0L0T0]

(c)

[M2LT-2]

(d)

[M2LT]

21. A body is moving in a circular path with acceleration a. If its velocity gets doubled, find the ratio of acceleration after and before the change

(a)

1 : 4

(b)

$\frac { 1 }{ 4 } :1$

(c)

2:1

(d)

4:1

22. A body of mass 'm' rests on a horizontal plane. It the angle of friction is ፀ, the least force required to move the body along the plane is (g = acceleration due to gravity).

(a)

mg sinፀ

(b)

mg cosፀ

(c)

mg tanፀ

(d)

mg secፀ

23. Two stones of masses m and 2m are whirled in horizontal circles, the heavier one in a radius $\frac { r }{ 3 }$ and the lighter one in radius r. The tangential speed of lighter stone is n times that of the value of heavier. stone when they experience same centripetal forces. The value of n is

(a)

4

(b)

1

(c)

2

(d)

3

24. A body of mass M hits normally a rigid wall with velocity V and bounces back with the same velocity. The impulse experienced by the body is

(a)

MV

(b)

1.5 MV

(c)

2MV

(d)

zero

25. A monkey is descending from the branch of a tree with constant acceleration. If the breaking strength is 75% of the weight of the monkey, the minimum acceleration with which monkey can slide down without branch is

(a)

g

(b)

$\frac { 3g }{ 4 }$.

(c)

$\frac { g }{ 4 }$

(d)

$\frac { g }{ 2 }$