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

11th Standard

Reg.No. :
•
•
•
•
•
•

Physics

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

25 x 1 = 25
1. If the length and time period of an oscillating pendulum have errors of 1% and 3% respectively then the error in measurement of acceleration due to gravity is

(a)

4%

(b)

5%

(c)

6%

(d)

7%

2. The density of a material in CGS system of units is 4 g cm-3 . In a system of units in which unit of length is 10 em and unit of mass is 100 g, then the value of density of material will be

(a)

0.04

(b)

0.4

(c)

40

(d)

400

3. The law of electricity and magnetism is used to

(a)

Wireless communication

(b)

Nuclear reactor

(c)

Steam engine

(d)

Aeroplane

4. The fraction of$1\over 273.16$ temperature of the triple point of water represents:

(a)

celsius

(b)

fahrenheit

(c)

(d)

kelvin

5. Which of the following is the most accurate?

(a)

200.0 m

(b)

20 X 101m

(c)

2 x 102 m

(d)

6. If C is the capacitance and V is the potential, the dimensional formula for CV2 is

(a)

ML2T-2

(b)

ML-1T-2

(c)

ML-2T-3

(d)

ML2T-1

7. The ratio of one nanometer to one micron is__________________

(a)

10-3

(b)

103

(c)

10-9

(d)

10-6

8. The displacement of particle is given by X = a$\frac{a_1t}{2}-\frac{2_2t^2}{3}$ What is its acceleration?

(a)

$\frac{2a_2}{3}$

(b)

$-\frac{2a_2}{3}$

(c)

a2

(d)

zero

9. Apassenger in the moving train throws a coin. If the coin falls in front of him, train must be moving with:

(a)

uniform speed

(b)

acceleration

(c)

deceleration

(d)

uniform velocity

10. The vectors $\vec A$ and $\vec B$ to be mutually orthogonal when

(a)

$\vec A+\vec B=0$

(b)

$\vec A-\vec B=0$

(c)

$\vec A.\vec B=0$

(d)

$\vec A\times \vec B=0$

11. A car starting from rest, accelerates at a constant rate x from sometimes after which it decelerates at a constant rate y to come to rest. If the total time elapsed is t, the maximum velocity attained by the car is given by

(a)

$\frac{xy}{x+y}t$

(b)

$\frac{xy}{x-y}t$

(c)

$\frac{x^2y^2}{x^2+y^2}t$

(d)

$\frac{x^2y^2}{x^2-y^2}t$

12. The second derivative of position vector with respect to time is

(a)

velocity

(b)

acceleration

(c)

force

(d)

displacement

(a)

0

(b)

1

(c)

$\infty$

(d)

none

14. In oblique projection horizontal range of the projectile is

(a)

$\frac{u^2\sin^2\theta}{2g}$

(b)

$\frac{2u\sin\theta}{g}$

(c)

$\frac{u^2\sin2\theta}{g}$

(d)

$\frac{u^2}{g}$

15. In non-uniform circular motion, the resultant acceleration makes an angle with the radius vector is

(a)

$\tan^{-1}(\frac{ra_t}{V^2})$

(b)

$\tan_{-1}(\frac{a_t}{(\frac{r}{v^2})})$

(c)

$\tan^{-1}(\frac{rv^2}{at})$

(d)

$\tan^{-1}(\frac{r+at^2}{v^2})$

16. Which of the following graph represents the equation y = kx2?

(a)

(b)

(c)

(d)

17. $X\propto \frac { 1 }{ Y }$ (or) XY = constant is represented by

(a)

(b)

(c)

(d)

18. Two blocks A & B of masses 2m & m are connected by a massless and inextensible strong. The magnitudes of acceleration of A & B immediately after the string is cut are

(a)

$\frac { g }{ 2 }$,g

(b)

g,g

(c)

g,$\frac { g }{ 2 }$

(d)

$\frac { g }{ 2 }$,$\frac { g }{ 2 }$

19. If the potential energy of the particle is $\alpha -\frac { \beta }{ 2 } { x }^{ 2 }$ then force experienced by the particle is

(a)

F=$\frac { \beta }{ 2 } { x }^{ 2 }$

(b)

F=βx

(c)

F=-βx

(d)

F=-$\frac { \beta }{ 2 } { x }^{ 2 }$

20. When a mass is rotating in a plane about a fixed point, its angular momentum is directed along,

(a)

a line perpendicular to the plane of rotation

(b)

the line making an angle of 450 to the plane of rotation

(c)

(d)

tangent to the path

21. In the following, what are the quantities which that are conserved?

(a)

Linear momentum of planet

(b)

Angular momentum of planet

(c)

Total energy of planet

(d)

Potential energy of a planet

22. With an increase in temperature, the viscosity of liquid and gas, respectively will

(a)

increase and increase

(b)

increase and decrease

(c)

decrease and increase

(d)

decrease and decrease

23. A hot cup of coff ee is kept on the table. Aft er some time it attains a thermal equilibrium with the surroundings. By considering the air molecules in the room as a thermodynamic system, which of the following is true

(a)

ΔU > 0, Q = 0

(b)

ΔU > 0, W < 0

(c)

ΔU > 0, Q > 0

(d)

ΔU = 0, Q > 0

24. Two identically sized rooms A and B are connected by an open door. If the room A is air conditioned such that its temperature is 4° lesser than room B, which room has more air in it?

(a)

Room A

(b)

Room B

(c)

Both room has same air

(d)

Cannot be determined

25. A simple pendulum has a time period T1. When its point of suspension is moved vertically upwards according as y = k t2, where y is vertical distance covered and k = 1 ms−2, its time period becomes T2. Then, $\frac { { T }_{ 1 }^{ 2 } }{ { T }_{ 2 }^{ 2 } }$ is (g = 10 m s−2)

(a)

$\frac{5}{6}$

(b)

$\frac{11}{10}$

(c)

$\frac{6}{5}$

(d)

$\frac{5}{4}$