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

11th Standard

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Physics

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

25 x 1 = 25
1. The sum of the numbers 436.32, 227.2 and 0.301 in appropriate significant figure is:

(a)

663.82

(b)

663.8

(c)

664

(d)

6663.82

2. If the percentage error in the measurement of mass and momentum of a body are 3% and 2%respectively, then maximum possible error in kinetic energy is ______________

(a)

2%

(b)

3%

(c)

5%

(d)

7%

3. The horizontal range of a projectile fired at an angle of 15° is 50 m. If it is fired with the same speed at angle of 45°, its range will be

(a)

125 m

(b)

75 m

(c)

100 m

(d)

150 m

4. Retardation means:

(a)

decreases with time

(b)

increases with time

(c)

increases and decreases

(d)

decreases and increases

5. A passenger in the moving train tosses a coin. If the coin falls behind him, train must be moving with:

(a)

acceleration

(b)

deceleration

(c)

uniform speed

(d)

all the above

6. The velocity-time graph of a particle moving in a straight line is given in the figure. The acceleration of the particle at time t = 9s is

(a)

-5 ms-2

(b)

-3 ms-2

(c)

5 ms-2

(d)

Zero

7. A balloon is rising vertically upwards with uniform acceleration of 15.7 m-2. A stone is released from it at one time. Another stone is released from the balloon 4s later. The distance between the two stones 6 seconds after the first stone is released is

(a)

715m

(b)

816m

(c)

625m

(d)

900m

8. The scalar product of two vectors will be minimum. When $\theta$ is equal to

(a)

0o

(b)

45o

(c)

180o

(d)

60o

9. The vector product of any two vectors gives a

(a)

vector

(b)

scalar

(c)

tensor

(d)

collinear

10. If two vectors $\vec A$ and $\vec B$ form adjacent sides of parallelogram, then the magnitude of $|\vec A\times \vec B|$ will give _______ of parallelogram.

(a)

length

(b)

area

(c)

volume

(d)

diagonal

11. If a body moving in a circular path with uniform speed, then

(a)

the acceleration is directed towards its centre

(b)

velocity and acceleration are perpendicular to each other

(c)

speed of the body is constant but its velocity is varying.

(d)

all the above

12. Twelve forces each of magnitude 10N acting on' a body at an angle of 30° with other forces then their resultant is

(a)

10 N

(b)

120 N

(c)

$\frac{10}{\sqrt{3}}$

(d)

zero

13. A particle moves in a circular path of radius 2 cm. If a particle completes 3 rounds, then the distance and displacement of the particle are

(a)

0 and 37.7

(b)

37.7 and 0

(c)

0 and 0

(d)

37.7 and 37.7

14. The slope of the position-time graph will give

(a)

displacement

(b)

velocity

(c)

acceleration

(d)

force

15. The displacement of the particle along a straight line at time t is given by X = a + bt + ctwhere a, b, c are constants. The acceleration of the particle is

(a)

a

(b)

b

(c)

c

(d)

2c

16. An object of mass 3 kg is at rest. Now a force of $\vec F=6t^2\hat i+4t\hat j$ is applied on the object, then the velocity of object at t = 3 second is

(a)

$18\hat i+3\hat j$

(b)

$18\hat i+6\hat j$

(c)

$3\hat i+18\hat j$

(d)

$18\hat i+4\hat j$

17. Two blocks of masses m and 2m are placed on a smooth horizontal surface as shown. In the first case only a force F1 is applied from the left. Later only a force F2 is applied from the right. If the force acting at the interface of the two blocks in the two cases is same, then F1 :F2 is

(a)

1:1

(b)

1:2

(c)

2:1

(d)

1:3

18. A ship of mass 3$\times$ 106 kg initially at rest is pulled by a force of 6 $\times$ 104 N through a distance of 4m. The speed of the ship is (Assume resistive of water is negligible)

(a)

1.5 m/s

(b)

20 m/s

(c)

0.5 m/s

(d)

0.4 m/s

19. Three blocks of masses 2 kg, 3 kg and 5 kg are connected to each other with light string & then placed on a frictionless surface. The system is pulled by a force F = 10N, then tension T1 is

(a)

1N

(b)

8N

(c)

5N

(d)

10N

20. 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

21. A body of imparted motion from rest to move in a straight line. If it is then obstructed by an opposite force, then:

(a)

the body will necessarily change direction

(b)

the body is sure to slow down

(c)

the body will necessarily continue to move in the same direction at the same speed

(d)

none of these

22. When two surfaces are coated with a lubricant, then they:

(a)

stick to each other

(b)

slide upon each other

(c)

roll upon each other

(d)

none of these

23. Identify the correct statement

(a)

static friction depends on the area of contact

(b)

kinetic friction depends on the area of contact

(c)

coefficient of static friction does not depend on the surfaces in contact

(d)

coefficient of kinetic function is less than the coefficient of static friction

24. When a body moving in circular path is subjected to a force acting towards the centre of its path it possess

(a)

uniform acceleration

(b)

non-uniform acceleration

(c)

centripetal acceleration'

(d)

acceleration

25. 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