#### 11th Standard Physics Oscillations English Medium Free Online Test One Mark Questions 2020 - 2021

11th Standard

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Physics

Time : 00:20:00 Hrs
Total Marks : 20

Answer all the questions

20 x 1 = 20
1. In a simple harmonic oscillation, the acceleration against displacement for one complete oscillation will be

(a)

an ellipse

(b)

a circle

(c)

a parabola

(d)

a straight line

2. The length of a second’s pendulum on the surface of the Earth is 0.9 m. Th e length of the same pendulum on surface of planet X such that the acceleration of the planet X is n times greater than the Earth is

(a)

0.9n

(b)

$\frac{0.9}{n}$m

(c)

0.9n2m

(d)

$\frac{0.9}{n^2}$

3. The time period for small vertical oscillations of block of mass m when the masses of the pulleys are negligible and spring constant k1 and k2 is

(a)

$T=4\pi \sqrt { m\left( \frac { 1 }{ { k }_{ 1 } } +\frac { 1 }{ { k }_{ 2 } } \right) }$

(b)

$T=2\pi \sqrt { m\left( \frac { 1 }{ { k }_{ 1 } } +\frac { 1 }{ { k }_{ 2 } } \right) }$

(c)

$T=4\pi \sqrt { m\left( { k }_{ 1 }+{ k }_{ 2 } \right) }$

(d)

$T=2\pi \sqrt { m\left( { k }_{ 1 }+{ k }_{ 2 } \right) }$

4. An ideal spring of spring constant k, is suspended from the ceiling of a room and a block of mass M is fastened to its lower end. If the block is released when the spring is un-stretched, then the maximum extension in the spring is

(a)

4$\frac { Mg }{ k }$

(b)

$\frac { Mg }{ k }$

(c)

2$\frac { Mg }{ k }$

(d)

$\frac { Mg }{ 2k }$

5. A hollow sphere is filled with water. It is hung by a long thread. As the water flows out of a hole at the bottom, the period of oscillation will

(a)

first increase and then decrease

(b)

first decrease and then increase

(c)

increase continuously

(d)

decrease continuously

6. When a damped harmonic oscillator completes 100 oscillations, its amplitude is reduced to $\frac{1}{3}$of its initial value. What will be its amplitude when it completes 200 oscillations?.

(a)

$\frac{1}{5}$

(b)

$\frac{2}{3}$

(c)

$\frac{1}{6}$

(d)

$\frac{1}{9}$

7. A particle excites simple harmonic motion between x = -A & x = +A, the time taken for it to go from 0 to $\frac{A}{2}$ is T1 & to go from $\frac{A}{2}$ to A is T2 then

(a)

T1<T2

(b)

T1>T2

(c)

T1=T2

(d)

T1=2T2

8. The simple harmonic motions are respresented by the equation. y1 = 0.1 sin (100πt + π/3) & Y2= 0.1 cos π the phase difference of the velocity of particle is

(a)

-$\frac { \pi }{ 6 }$

(b)

$\frac { \pi }{ 3 }$

(c)

-$\frac { \pi }{ 6 }$

(d)

$\frac { \pi }{ 6 }$

9. The man velocity of a particle, executing simple harmonic motion with an amplitude 7 mm is 4.4 m s-1. The period of oscillation is

(a)

0.01 s

(b)

0.1 s

(c)

10 s

(d)

100 s

10. A particle executing simple harmonic motion along y-axis has its motion described by the equation y = A.sin (ωt) + B, the amplitude of the example harmonic motion is

(a)

A

(b)

B

(c)

A+B

(d)

$\sqrt{A+B}$

11. A particle is executing SHM at mid point of mean position & extermity. What is the potential energy in terms of total energy (E)

(a)

$\frac{E}{4}$

(b)

$\frac{E}{16}$

(c)

$\frac{E}{2}$

(d)

$\frac{C}{8}$

12. What is time period of a pendulum hanged in a satellite? (T is time period on earth)

(a)

zero

(b)

T

(c)

infinite

(d)

$\frac { T }{ \sqrt { 6 } }$

13. The magnitude of acceleration of particle executing SHM at the position of maximum displacement is

(a)

zero

(b)

minimum

(c)

maxmium

(d)

none of these

14. Find the length of a simple pendulum whose period is 2.00 s.

(a)

2 m

(b)

0.4 m

(c)

0.1 m

(d)

3 m

15. The three springs with force constant ${ k }_{ 1 }=7.5\frac { N }{ m } ,{ k }_{ 2 }=10.0\frac { N }{ m } ,{ k }_{ 3 }=12.5\frac { N }{ m }$, are connected in parallel to a mass of 0.500 kg. The mass is then pulled to the right and released. Then the period of the motion is.

(a)

0.6s

(b)

0.8s

(c)

0.5 s

(d)

004 s

16. A particle executing a SHM has a maximum displacement of 2 cm its acceleration at a distance of 0.5 cm from its mean position is 2 cm/s2, What will be its velocity when it is at a distance of 1 cm from its mean position?

(a)

4 cm/s

(b)

2$\sqrt{3}$

(c)

11.2 cm/s

(d)

4$\sqrt{7}$

17. The piston in the cylinder head of a locomotive has a stroke (twice the amplitude) of 1.0 m.1f the piston moves with S.H.M with an angular frequency of 200 rad/min. Then the maximum speed will be,

(a)

50 m/min

(b)

100m/min

(c)

150m/min

(d)

200 m/min

18. Asmall body of mass 50 g is undergoing SHM of amplitude 100 em and period 0.2 s. What is the maximum value of the force acting on the body?

(a)

86.4 N

(b)

98.5 N

(c)

102.1 N

(d)

71.2 N

19. In order to double the period of a simple pendulum _______.

(a)

its length should doubled

(b)

its length should be quadrupled

(c)

the mass of its bob should be doubled

(d)

the mass of its bob should be quadrupled.

20. A particle is executing SHM. Then the graph of velocity as a function of displacement is _______.

(a)

straight line

(b)

circle

(c)

ellipse

(d)

hyperbola