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Class 10 Questions asked by Filo students

Question 1

Question 23.1

{"A shaft is used as a torsion spring for the wheels of a right automobile as shown in the figure having spring constant as $1000 N / m$ . The mass of the wheel is $14 K g$ and the radius of gyration is $0.225 m$ . The distance between the center of the wheel and the center of the torsional shaft is $c = 0.300 m$ ","What is the natural frequency of the system when the wheels are not locked.","This question has single correct option","A. $37.56 rad / s$ "}

Topic:

Atoms, Nuclei & Dual nature

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Question 2

road, the minimum value of

u

, so that the student is able catch the bus is

$5 ms^{- 1}$
$8 ms^{- 1}$
$10 ms^{- 1}$
$12 ms^{- 1}$

Topic:

Mechanics

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Question 3

Example

30.4

A pole of height

4 m

is kept in front of a vertical plane mirror of length

2 m

. The lower end of the mirror is at a height of

6 m

from the ground. The horizontal distance between the mirror and the pole is

2 m

. Upto what minimum and maximum heights a man can see the image of top of the pole at a horizontal distance of

4 m

(from the mirror) standing on the same horizontal line which is passing through the pole and the horizontal point below the mirror?

Topic:

Optics

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Question 4

A three-wheeler starts from rest, accelerates uniformly with

1 m s^{- 2}

on a straight road for

10 s

, and then moves with uniform velocity. Plot the distance covered by the vehicle during the

n^{e x t t h}

second

(n = 1, 2, 3 l d o t s)

versus

n

. What do you expect this plot to be during accelerated motion : a straight line or a parabola ?

Topic:

Mechanics

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Question 5

7. In the system shown, pulley and strings are ideal. The vertically upward pull Fis being increased gradually, find magnitude of Fand acceleration of the

5 kg

block at the moment the

10 kg

block leaves the floor.

Topic:

Mechanics

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Question 6

11. Find force in newton which mass A exerts on mass B if B is moving towards right with

3 m / s^{2}

. Also find mass of A.(All surfaces are smooth)

Topic:

Mechanics

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Question 7

22. A block of mass

m

lies on wedge of mass

M

as shown in figure. Answer following parts separately. (i) With what minimum acceleration must the wedge be moved towards right horizontally so that block m falls freely. (ii) Find the minimum friction coefficient required between wedge

M

and ground so that it does not move while block m slips down on it.

Topic:

Mechanics

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Question 8

\underline{e x t EXERC I SE (S - 2)}

1. A ladder is hanging from ceiling as shown in figure. Three men

A, B

and

C

A BC

masses

40 kg, 60 kg

and

50 kg

are climbing the ladder. Man

A

is going up withretardation

2 m / s^{2}, C

is going up with an acceleration of

1 m / s^{2}

and man

B

isgoing up with a constant speed of

0.5 m / s

. Find the tension in the string supportingthe ladder.

l e f t [g = 9.8 m / s^{2} i g h t]

Topic:

Mechanics

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Question 9

6. Two men of masses

m_{1}

and

m_{2}

, hold on the opposite ends of a rope passing over a frictionless pulley. The man

m 1

climbs up the ropewith an acceleration of

1.2 m / s^{2}

relative to the rope. The mann

m_{2}

, limbsup the rope with an acceleration of

2 m / s^{2}

relative to the rope. Find the tension in the rope if

m_{1} = 40 kg

and

m^{2} = 60 kg .

Also find the time after which they will be at same horizontal level if they start from rest and are initially separated by

5 m

Topic:

Mechanics

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Question 10

In the arrangement shown in figure neglect the masses of the pulley and string and also friction. The accelerations of blocks

A

and

B

are

$g, g / 2^{p r im e}$
$g /2, g$
$3 g /2, 3 g /4$
g, ~ } \mathrm{~g}

Topic:

Mechanics

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Question 11

1. Determine the horizontal velocity

v_{0}

with which a stone must be projected horizontally from a point

P

, so that it may hit the inclined plane perpendicularly. The inclination of the plane with the horizontal is 0 and point

P

is at a height

/

above the foot of the incline, as shown in the figure,

Topic:

Mechanics

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Question 12

In the following arrangement the system is initially at rest. The

5 kg

block is now released. Assuming the pulleys and string to be massless and smooth, the acceleration of blocks is

$a_{w e d g e} = \frac{g}{7}$
$a_{B} = 0 m / s^{2}$
$a_{e} = \frac{5}{7} m / s^{2}$
$2 a_{c}^{3} a_{hba r}$

Topic:

Mechanics

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Question 13

For a CE-transmitter amplifier, the audio signal voltage across the collector resistance of 2

k Ω

2 V

. Suppose the current amplification factor of the transistor is 100 , find the input signal voltage and base current, if the base resistance is

1 k Ω

Topic:

Heat & Thermodynamics

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Question 14

Identify the correct statement related to the projectile motion :

It is uniformly accelerated everywhere
It is uniformly accelerated everywhere except at the highest position where it is moving with constant velocity
Acceleration is never perpendicular to velocity
None of the above

Topic:

Mechanics

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Question 15

A ball is projected with a velocity