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

11th Standard

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Physics

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

Answer all the questions

25 x 1 = 25
1. Which relation is wrong?

(a)

1 fermi = 10-14 m

(b)

r nanometer = 10-9 m

(c)

1 AU = 1.496 X 1011 m

(d)

1 parsec = 3.26 light year

2. Two quantities A and B have different dimensions which mathematical operation given below is physically meaningful?

(a)

A/B

(b)

A+B

(c)

A-B

(d)

A=B

3. The ratio of one nanometer to one micron is__________________

(a)

10-3

(b)

103

(c)

10-9

(d)

10-6

4. Zero error of an instrument is a______________.

(a)

Systematic error

(b)

Random error

(c)

Gross error

(d)

Both (a) and (b)

5. Dimensions [M L-1T-1] are related to_____________

(a)

torque

(b)

work

(c)

energy

(d)

Coefficient of viscosity

6. If a particle has negative velocity and negative acceleration, its speed

(a)

increases

(b)

decreases

(c)

remains same

(d)

zero

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

(a)

0.2047 rad/s; 0.0314 ms-1

(b)

0.2547 rad/s; 0.314 ms-1

(c)

0.1472 rad/s; 0.06314 ms-1

(d)

0.1047 rad/s; 0.00314 ms-1

9. The speed of a train is reduced from 60 kmh-1 to 15 kmh-1 in a distance of 450 m. If the retardation is uniform is the distance, it will travel further before coming to rest is

(a)

25m

(b)

30m

(c)

15m

(d)

20m

10. The radius of the earth was measured by

(a)

Newton

(b)

Eratosthenes

(c)

Galileo

(d)

Ptolemy

11. Which of the following is not a scalar?

(a)

Volume

(b)

angular momentum

(c)

Relative density

(d)

time

12. If the radii of circular paths of two particles of same masses are in the ratio 2 : 3 then to have a constant centripetal force, their velocities should be in a ratio of

(a)

$1:\sqrt { 2 }$

(b)

$\sqrt { 2 } :\sqrt { 3 }$

(c)

$\sqrt { 3 } :\sqrt { 2 }$

(d)

1:$\sqrt { 3 }$

13. The unit of co-efficient of static friction is

(a)

N

(b)

Mn

(c)

Ns

(d)

no unit

14. 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

15. Same retarding force is applied to stop the train in certain distance. When the speed is doubled, how is this distance changed?

(a)

Remain same

(b)

Gets doubled

(c)

Gets doubled

(d)

Gets four times

16. A stationary particle explodes into two particles of masses m1and m2, which move in opposite directions with velocities v1 and v2. The ratio of their kinetic energies E1IE2 is

(a)

m2/m1

(b)

m1/m2

(c)

1

(d)

m1v2/m2v1

17. A closed cylindrical container is partially filled with water. As the container rotates in a horizontal plane about a perpendicular bisector, its moment of inertia,

(a)

Increases

(b)

decreases

(c)

remains constant

(d)

depends on direction of rotation.

18. Which of the following has largest M.I

(a)

Ring about its axis perpendicular to its plane

(b)

Disc about its axis perpendicular to its plane

(c)

Solid sphere

(d)

Bar magnet

19. When a steady torque is acting on a body, the body:

(a)

continues in its state of rest or uniform motion along a straight line

(b)

gets linear acceleration

(c)

gets angular acceleration

(d)

rotates at a constant speed

20. The moment of inertia of a body about a given axis is 1.2 kgm2. Initially, the body is at rest. In order to produce a rotational kinetic energy of 1500 joule, an angular acceleration 25 radian/sec2 must be applied about that axis lor a duration of

(a)

4 s

(b)

2 s

(c)

8 s

(d)

10 s

21. The positions of two masses m1 and m2 are x1 and x2. The position of center of mass is

(a)

$\frac{m_1m_2}{m_1x_1+m_2x_2}$

(b)

$m_1x_1+m_2x_2$

(c)

$\frac{m_1x_1+m_2x_2}{m_1+m_2}$

(d)

$\frac{m(x_1+x_2)}{m_1+m_2}$

22. The gravitational potential energy of the Moon with respect to Earth is

(a)

always positive

(b)

always negative

(c)

can be positive or negative

(d)

always zero

23. In a streamline flow

(a)

the speed ofa particle always remain same

(b)

the velocity of a particle always remains same

(c)

the kinetic energies of all the particles arriving at a given point at the same

(d)

the moments of the particles arriving at a given point are different

24. A raindrop falls near the surface of the earth with almost uniform velocity because

(a)

its weight is negligible

(b)

the force of surface tension balances its weight

(c)

the force of viscosity of air balances its weight

(d)

the drops are charged and atmospheric electric field balances its weight

25. If the temperature of the wire is increased, then the Young’s modulus will

(a)

remain the same

(b)

decrease

(c)

increase rapidly

(d)

increase by very a small amount