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

11th Standard

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Physics

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

25 x 1 = 25
1. Planck's constant (h), speed of light in vacuum (c) and Newton's gravitational constant (G) are taken as three fundamental constants. Which of the following combinations of these has the dimension of length?

(a)

${{\sqrt{hG}}\over{{c}^{{{3}\over{2}}}}}$

(b)

${{\sqrt{hG}}\over{{c}^{{{5}\over{2}}}}}$

(c)

$\sqrt{{{hc}\over{G}}}$

(d)

$\sqrt{{{Gc}\over{{h}^{{{3}\over{2}}}}}}$

2. If a circle with 10 m radius and angle 60° at centre, then what will be the length of arc?

(a)

5.24m

(b)

6.21m

(c)

7.1 mm

(d)

10m

3. ___________ system of units was accepted by the scientists of the general conference on weights and measures.

(a)

FPS

(b)

CGS

(c)

MKS

(d)

SI

4. One degree of arc is equal to_______

(a)

1.457$\times$102rad

(b)

1.457$\times$10-2rad

(c)

1.745$\times$102rad

(d)

1.745$\times$10-2rad

5. The pressure on a square plate is measured by measuring the force on the plate and the length of the sides of the plate by using the formula p =$F\over l^2$ .If the maximum errors in the measurement of force and length are 4% and 2% respectively, then the maximum error in the measurement of pressure is _________________

(a)

1%

(b)

2%

(c)

8%

(d)

10%

6. A projectile has initially the same horizontal component of velocity as it would acquire if it had moved from rest with uniform acceleration 1 ms-2? for half a minute. If it reaches the maximum height of 90 m, the angle of, projection is (g =10 ms-2).

(a)

tan -1$({1\over \sqrt{5}})$

(b)

tan -1$({1\over \sqrt{2}})$

(c)

tan -1$({1\over \sqrt{3}})$

(d)

tan -1$({ \sqrt{2}})$

7. An object is dropped from rest. Its v - t graph is

(a)

(b)

(c)

(d)

8. When a horse pulls a wagon, the force that causes the horse to move forward is the force?

(a)

the ground exerts on him

(b)

he exerts on the ground

(c)

the wagon exerts on him

(d)

the exerts on the wagon

9. Which of the following force tends to stopthe moving object?

(a)

Frictional force

(b)

Magnetic force

(c)

Gravitational force

(d)

Electric force

10. 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

11. 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

12. Which of the following is the dimension of coefficient of friction?

(a)

[MLT-2]

(b)

[M0L0T0]

(c)

[M2LT-2]

(d)

[M2LT]

13. Rate of change of momentum of an object is equal to

(a)

acceleration

(b)

work done

(c)

force

(d)

impulse

14. 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=-$\frac { \beta }{ 2 } { x }^{ 2 }$

15. Two equal masses m1 and m2 are moving along the same straight line with velocities 5ms-1 and -9 ms-1 respectively. If the collision is elastic, then calculate the velocities after the collision of m1 and mrespectively

(a)

-4ms-1 and 10 ms-1

(b)

10ms-1 and 0 ms-1

(c)

-9ms-1 and 5 ms-1

(d)

5ms-1 and 1 ms-1

16. Water stored in a dam possesses

(a)

no energy

(b)

electrical energy

(c)

kinetic energy

(d)

potential energy

17. A shell, in flight explodes into four unequal parts. Which is conserved?

(a)

potential energy

(b)

momentum

(c)

kinetic energy

(d)

both a and c

18. Unit of work is:

(a)

watt

(b)

newton

(c)

joule

(d)

no unit

19. A particle is dropped from a height h. A constant horizontal velocity is given to the particle. Taking g to be constant everywhere, kinetic energy E of the particle with respect to time z is correctly shown in:

(a)

(b)

(c)

(d)

20. In an explosion, a body breaks up into two pieces of unequal masses. In this:

(a)

both parts will have numerically equal momentum

(b)

lighter part will have more momentum

(c)

heavier part will have more momentum

(d)

both parts will have equal kinetic energy

21. A long spring when stretched by 2 cm its potential energy is U. If the spring is stretched by 10 cm. then the potential energy of the spring is

(a)

$\frac{U}{5}$

(b)

5U

(c)

$\frac{U}{25}$

(d)

25U

22. A block of mass M is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has force constant value k. The mass is released from rest with the spring initially unstretched. The maximum extension produced in the length of the spring will be

(a)

2Mg/k

(b)

4Mg/k

(c)

Mg/2k

(d)

Mg/k

23. 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

24. Two bodies with kinetic energies in the ratio of 4: 1 are moving with equal linear momentum. The ratio of their masses is

(a)

4: 1

(b)

1:1

(c)

1:2

(d)

1:4

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)