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

11th Standard

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Physics

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

Answer all the questions

25 x 1 = 25
1. The dimensional formula for gravitational constant G is

(a)

[ML3T-2]

(b)

[M-1L3T-2

(c)

[M-1L-3T-2

(d)

[ML-3T-2

2. High precision instruments are used to eliminate:

(a)

personal error

(b)

random error

(c)

chance error

(d)

least count error

3. If the energy E = GPhqCr where G is the universal gravitational constant, h is the planck's constant and C is the velocity of light, then the values of p, q and r are respectively:

(a)

$-{1\over2},{1\over2}and {5\over2}$

(b)

${1\over2},-{1\over2}and-{5\over2}$

(c)

$-{1\over2},{1\over2}and {3\over2}$

(d)

$-{1\over2},-{1\over2}and- {3\over2}$

4. A force F is applied on to a square plate of side L.If the percentage error in determining L is 2% and rhat in F is 4%, the percentage error in pressure is

(a)

8%

(b)

4%

(c)

6%

(d)

3%

5. TIle dimensional formula of torque is

(a)

[ML2T-2]

(b)

[MLT-2]

(c)

[ML-1T-2]

(d)

[ML-2T-2]

6. The study of production and propagation of sound waves________

(a)

Astrophysics

(b)

Acoustics

(c)

Relativity

(d)

Atomic physics

7. Fundamental quantities can also be known as________quantities.

(a)

original

(b)

physical

(c)

negative

(d)

base

8. The range of distance can be measured by using direct methods is________

(a)

10-2 to 10-5 m

(b)

10-2 to 102 m

(c)

102 to 10-5 m

(d)

10-2 to 105 m

9. The maximum possible error in the difference of two quantities is___________.

(a)

Z=A+B

(b)

$\triangle Z=\triangle A-\triangle B$

(c)

$\frac{\triangle Z}{Z}=\frac{\triangle A}{A}+\frac{\triangle B}{B}$

(d)

$\frac{\triangle Z}{Z}=\frac{\triangle A\triangle B}{AB}$

10. If a particle executes uniform circular motion in the xy plane in clock wise direction, then the angular velocity is in

(a)

+y direction

(b)

+z direction

(c)

-z direction

(d)

-x direction

11. A body is allowed to fall from a height of 100 m. If the time taken for the first 50m is t1, and for the remaining 50m is t2, then:

(a)

t1 = t2

(b)

t1 > t2

(c)

t1 < t2

(d)

depends upon the mass

12. A man wants to hit the target, he should point its rifle:

(a)

higher than target

(b)

lower than target

(c)

in the same direction

(d)

nothing can be said

13. Electric charge is an example for_________quantity.

(a)

vector

(b)

fundamental

(c)

scalar

(d)

both (a) and (b)

14. If the velocity of a particle is v= At + Bt2, where A and B are constants, then the distance travelled by it between I sand 2 s is

(a)

${3\over2}A+{7\over3}B$

(b)

${A\over2}+{B\over3}$

(c)

${3\over2}A+4B$

(d)

$3A+7B$

15. If a car at rest accelerates uniformly to a speed of 144 krn/h in 20 sec, it covers a distance of

(a)

1440cm

(b)

2980cm

(c)

20m

(d)

400m

16. A bus travelling the first one-third distance at a speed of 10 km/h, the next one-third at 20 km/h and at last one-third at 60 km/h. The average speed of the bus is

(a)

9km/h

(b)

16km/h

(c)

18km/h

(d)

48km/h

17. If $\hat n$ is a unit vector along the direction of $\vec A$, the $\hat n$ is

(a)

$\vec AA$

(b)

n x A

(c)

$\frac{\vec A}{A}$

(d)

$\vec A|A|$

18. $\hat i.\hat j$ is

(a)

0

(b)

1

(c)

$\infty$

(d)

none

19. The vector product of two vectors will have maximum magnitude when $\theta$ is equal to

(a)

0o

(b)

90o

(c)

180o

(d)

360o

20. 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

21. While walking, the vertical component of reactive force balances our:

(a)

force

(b)

mass

(c)

weight

(d)

impulse

22. Which one of the following motions on a smooth plane surface does not involve force?

(a)

accelerated motion in a straight line

(b)

retarded motion is a straight line

(c)

motion with constant momentum along a straight line

(d)

motion along a straight line with varying velocity

23. A jet engine works on the principle of:

(a)

conservation of linear momentum

(b)

conservation of mass

(c)

conservation of energy

(d)

conservation of angular momentum

24. If the linear momentum of the object is increased by 0.1% then the kinetic energy is Increased by

(a)

0.1 %

(b)

0.2 %

(c)

0.4 %

(d)

0.01 %

25. 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)