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Solution for Class 11, Physics

Views: 5,487

4. An open U-tube of uniform cross-section contains mercury. If

27.2 cm

of water column is poured into one limb of the tube, how high does the mercury surface rise in the other limb from its initial level?

l e f t [ρ_{w} = 1 g / cm^{3} i g h t .

l e f t . ρ_{Hg} = 13.6 g / cm^{3} i g h t]

Topic:

Mechanics

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Views: 5,686

Kg

, meter and minute are taken as the units of mass, length and time then the numerical value of a force of 1000 dyne is

360 units
3600 units
$0.36$ units
36 units

Topic:

Mechanics

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Views: 5,585

A hollow sphere of mass

1 kg

10 cm

is free to rotate about its diameter. If a force of

30 N

is applied tangentially to it, its angular acceleration is

l e f t (i g h t .

l e f t . rad / s^{2} i g h t)

5000
450
50
5

Topic:

Atoms, Nuclei & Dual nature

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Views: 5,594

23. Find the acceleration of the blocks

A

B

in the situ 23. Find the acceleration of the blocks

A

B

in the situation shown in the figure.

Topic:

Mechanics

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Views: 5,178

m

stands on a platform of equal mass

m

and pulls himself by two ropes passing over pulleys as shown in figure. If he pulls each rope with a force equal to half his weight, his upward acceleration would be

$\frac{g}{2}$
$\frac{g}{4}$
$g$
zero

Topic:

Mechanics

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Views: 5,674

When the trolley shown in figure is given a horizontal acceleration

a

, the pendulum bob of mass

m

gets deflected to a maximum angle

θ

with the vertical. At the position of maximum deflection, the net accelemtion of the bob with respect to trolley is

$g^{2} + a^{2}$
$a cos θ$
$g sin θ - a cos θ$
$a sin θ$

Topic:

Mechanics

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Views: 5,861

A particle performs uniform circular motion with an angular momentum

L

. If the frequency of particles motion is doubled and its kinetic energy is halved, the angular momentum becomes:

$2 L$

Topic:

Mechanics

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Views: 5,896

In the figure shown, the value of

θ

at the moment shown is :

$tan^{- 1} l e f t (\frac{3}{4} r i g h t)$
$t a n^{- 1} l e f t (\frac{4}{3} r i g h t)$
$t a n^{- 1} l e f t (\frac{3}{8} r i g h t)$
NOT

Topic:

Mechanics

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Views: 5,212

Weight of a body decreases by

1.5%

when it is raised to a height

h

above the surface of earth. When the same body is taken to same depth

h

in a mine, its weight will show

$0.75%$ increase
$3.0$ decrease
$0.75%$ decrease
$1.5%$ decrease

Topic:

Mechanics

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Question 10

Views: 5,617

33. A plane parallel oil film

(m u = 1.4)

floating on water is illuminated by white light at normal incidence. If the thickness of film is

300 nm

the most reflected wavelength will be :- (1)

4400 AA

6400 AA

5600 AA

7200 AA

Topic:

Atoms, Nuclei & Dual nature

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Question 11

Views: 5,454

The acceleration-time graph of a particle is as shown. At what time the particle acquires its initial velocity?

$12 s$
$5 s$
$8 s$
$16 s$

Topic:

Mechanics

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Question 12

Views: 5,326

Three projectiles

A, B

C

are thrown simultaneously from the same point in the same vertical plane. Their trajectories are shown in the figure. Then which of the following statement is false.

The time of flight is the same for all the three.
The launch speed is greatest for particle C.
The vertical velocity component for particle $C$ is greater than that for the other particles
$Y$ -coordinate of all particles is always same

Topic:

Mechanics

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Question 13

Views: 5,472

A ball is thrown up with a velocity

49 m / s

2.5

Acceleration reduces
Velocity reduces to two thrid
Velocity reduces to three fourth
Kinetic energy reduces to one fourth

Topic:

Mechanics

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Question 14

Views: 5,325

A constant power of 10 watt is applied at a body of mass

1 kg

initially at rest. The speed of body after 5 sec is (Force is acted in same direction of motion)

Zero
$10 m / s$
$20 m / s$
$40 m / s$

Topic:

Mechanics

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Question 15

Views: 5,158

A light and a heavy body have equal energy. Which one has greater momentum ?

Heavier body
Lighter body
Both have equal momentum
Data is insufficient

Topic:

Mechanics

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Question 16

Views: 5,426

A man claims that his bike of mass

120 kg

reaches upto speed

72 km / hr

from rest in 20s. The power of bike is-

500 watt
$1.2 k$ watt
$2.4 k$ watt
$3 k$ watt

Topic:

Mechanics

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Question 17

Views: 5,211

Work done by pseudo force is-

Always negative
Always positive
May be positive, negative or zero
Depend upon shape of body

Topic:

Mechanics

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Question 18

Views: 5,323

A point moves in

x - y

plane according to the law

x = 4 sin 6 t

y = 4 (1 - cos 6 t)

. The distance (in meter) traversed by the particle in 4 seconds is: (x and

y

q f

Topic:

Mechanics

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Question 19

Views: 5,880

Which of the following is a vector quantity?

Time
Speed
Distance
Acceleration

Topic:

Heat & Thermodynamics

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Question 20

Views: 5,611

A small hole is made at the bottom of a symmetrical jar as shown in figure. A liquid is filled into the jar upto a certain height. The rate of descension of liquid is independent of the level of the liquid in the jar. Then the surface of the jar is a surface of revolution of the curve -

y = k x^{4} =

y = k x^{3}

kx^{4}

$y = k x^{2}$

Topic:

Mechanics

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