#### 11th Standard Physics English Medium Free Online Test 1 Mark Questions 2020 - Part Four

11th Standard

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Physics

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

25 x 1 = 25
1. If the error in the measurement of radius is 2%, then the error in the determination of volume of the sphere will be

(a)

8%

(b)

2%

(c)

4%

(d)

6%

2. If E & B respectively, represent electric field and magnetics induction field, then the ratio E & B has the dimensions of

(a)

angle

(b)

acceleration

(c)

velocity

(d)

displacement

3. If energy (E), velocity (V) and time (T) are chosen as the fundamental quantities, the dimensional formula of surface tension will be:

(a)

Ey-1 T2

(b)

Ey-2 T2

(c)

Ey1 T-2

(d)

Ey-2 T-2

4. The pair of quantities having same dimensions is

(a)

Impulse and Surface Tension

(b)

Angular momentum and Work

(c)

Work and Torque

(d)

Young's modulus and Energy

5. 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%

6. Which one out of the following statement is false?

(a)

A body can have zero velocity and still be accelerated

(b)

A body can have a constant velocity and still have a varying speed

(c)

A body can have a constant speed and still have a varying velocity

(d)

The direction of the velocity of a body can change when its acceleration is constant

7. Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time t1. On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time f2• The time taken by her to walk upon the moving escalator will be

(a)

${t_1t_2\over t_2-t_1}$

(b)

${t_1t_2\over t_2+t_1}$

(c)

t1-t2

(d)

${ t_2+t_1\over 2}$

8. A boy standing at the top of a tower of 20 m height drops a stone. Assuming g = 10 m S-2, the velocity with which it hits the ground is

(a)

10.0m/s

(b)

20.0m/s

(c)

40.0m/s

(d)

5.0m/s

9. The distance travelled by a particle starting from rest and moving with an acceleration ${4\over3}ms^{-2}$ ,in the third second is

(a)

${10\over 3}m$

(b)

${19\over3}m$

(c)

6m

(d)

4m

10. 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

11. A vehicle is moving along the positive x direction, if sudden brake is applied, then

(a)

frictional force acting on the vehicle is along negative x direction

(b)

frictional force acting on the vehicle is along positive x direction

(c)

no frictional force acts on the vehicle

(d)

frictional force acts in downward direction

12. A ball with an initial momentum P collides normally with a rigid wall. If P1 is the linear momentum after the perfectly elastic collision, then

(a)

P1 = P

(b)

P1 = -P

(c)

P1 = 2P

(d)

P1 =-2P

13. A spacecraft of mass M moving with velocity v in free space explodes and breaks into two pieces. After the explosion a mass m of the spacecraft is left stationary. The velocity of  other part is

(a)

$\frac { mv }{ M-n }$

(b)

$\frac { M+n }{ Mv }$

(c)

$\frac { Mv }{ M-m }$

(d)

$\frac { Mv }{ m }$

14. The motion of a rocket is based on the principle of conservation of

(a)

Linear momentum

(b)

K.E

(c)

Mass

(d)

Angular momentum

15. A man getting down a running bus falls forward:

(a)

due to inertia of rest, road is left behind and man reaches forward

(b)

due to inertia of motion upper part of body continues to be in motion in forward direction while feet come to rest as soon as they touch the road

(c)

as he leans forward as a matter of habit

(d)

due to the combined effect of all the three factors stated in (a), (b) and (c)

16. From which law, the law of conservation of momentum can be derived?

(a)

Newton's first law of motion

(b)

Newton's second law of motion

(c)

Newton's third law of motion

(d)

All of these laws

17. The force required to stop a moving object depends on its:

(a)

mass alone

(b)

velocity alone

(c)

mass or velocity

(d)

mass and velocity

18. When a particle is in uniform motion it does not have

(a)

(b)

(c)

(d)

transverse velocity and transverse acceleration

19. A stone is dropped from a height h. It hits the ground with a certain momentum P. If the same stone is dropped from a height 100% more than the previous height, the momentum when it hits the ground will change by

(a)

68%

(b)

41%

(c)

200%

(d)

100%

20. A spring of force constant k is cut into two pieces such that one piece is double the length of the other. Then, the long piece will have a force constant of

(a)

$\frac{2}{3}$k

(b)

$\frac{3}{2}$k

(c)

3k

(d)

6k

21. The force on a particle as the function of displacement x is given by F = 9 + 0.3x. The work done corresponding to displacement of 6. particle from x = 0 to x = 2 unit is

(a)

18.6 J

(b)

21 J

(c)

25 J

(d)

9.6 J

22. The kinetic energy of the satellite orbiting around the Earth is

(a)

equal to potential energy

(b)

less than potential energy

(c)

greater than kinetic energy

(d)

zero

23. If the temperature and pressure of a gas is doubled the mean free path of the gas molecules

(a)

remains same

(b)

doubled

(c)

tripled

(d)

24. The damping force on an oscillator is directly proportional to the velocity. The units of the constant of proportionality are

(a)

kg m s−1

(b)

kg m s−2

(c)

kg s−1

(d)

kg s

25. Consider two uniform wires vibrating simultaneously in their fundamental notes. The tensions, densities, lengths and diameter of the two wires are in the ratio 8 : 1, 1 : 2, x : y and 4 : 1 respectively. If the note of the higher pitch has a frequency of 360 Hz and the number of beats produced per second is 10, then the value of x : y is

(a)

36 : 35

(b)

35 : 36

(c)

1 : 1

(d)

1 : 2