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Class 8 Questions asked by Filo students

Question 1

Resultant of three vectors of magnitudes 10 each be 10 if

θ

$9 0^{\circ}$
$0^{\circ}$
$3 0^{\circ}$
of any value

Topic:

Mechanics

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Question 2

Two forces of equal magnitudes produces resultant of

10 N

. If both are rotated by

3 0^{\circ}

eac in opposite directions, resultant becomes zer Calculate magnitudes of each vectors.

$10 N$
$5 N$
$52 N$
$15 N$

Topic:

Mechanics

View solution

Question 3

Two forces of equal magnitudes produces a resultant of

10 N

. If both are rotated by

3 0^{\circ}

each in opposite directions, resultant becomes zero. Calculate magnitudes of each vectors.

$10 N$
$5 N$
$52 N$
$15 N$

Topic:

Mechanics

View solution

Question 4

Two forces of equal magnitudes produces a resultant of

10 N

. If both are rotated by

3 0^{\circ} each

in opposite directions, resultant becomes zero. Calculate magnitudes of each vectors.

$10 N$
$5 N$
$52 N$
$15 N$

Topic:

Mechanics

View solution

Question 5

From figure, the correct relation is

$o v err i g h t a rro w A + o v err i g h t a rro w B + o v err i g h t a rro w E = o v err i g h t a rro w 0$

Topic:

Mechanics

View 2 solutions

Question 6

Out of the following set of forces, the resultant of which cannot be zero?

$10, 10, 10$
$10, 10, 20$
$10, 20, 20$
$10, 20, 40$

Topic:

Mechanics

View 6 solutions

Question 7

egin{array}{llll} ext { (a)deer } & ext { (b)giraffe } & ext { (c)frog } & ext { (d)fox }end{array} 6.The distance between Romys home and Swatis home is

1427 m

. The distance is equal to

$14.27 km$
$142.7 km$
$1.427 km$
$0.1427 km$

Topic:

Electrostats

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Question 8

A particle moves rectilinearly. Its displacement

x

at time

t

is given by

x^{2} = t^{2} + 1

. Its acceleration at displacement

(x)

is -

$\frac{1}{x ^{3}}$
$\frac{1}{x} - \frac{1}{x ^{2}}$
$- \frac{1}{x ^{2}}$
None

Topic:

Mechanics

View solution

Question 9

A circular hole of radius

l e f t (\frac{a}{2} i g h t)

is cut out of a circular disc of radius a as shown in figure. The centroid of the remaining circular portion with respect to point O will be :

$\frac{1}{6} a$
$\frac{10}{11} a$
$\frac{5}{6} a$
$\frac{2}{3} a$

Topic:

Mechanics

View 4 solutions

Question 10

Find out the speed of rod at end

A

along wall -

10
$103$
5
None

Topic:

Mechanics

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Question 11

Gurukripa 28. Find out the speed of rod at end

A

along wall -

10
$103$
5
None

Topic:

Mechanics

View solution

Question 12

Find out the speed of rod at end A along wall -

10
$103$
5
None

Topic:

Mechanics

View solution

Question 13

A body of weight

2 kg

is suspended as shown in the figure. The tension

T_{1}

in the horizontal string (

kg

wt) is

Topic:

Mechanics

View 7 solutions

Question 14

Projectile Motion ve If at an instant the velocity of a projectile be

60 m / s

and its inclination to the horizontal be

3 0^{\circ}

, at what time interval (in sec) after that instant will the particle be moving at right angles to its former direction.

l e f t (g = 10 m / s^{2} i g h t)

PART - III : ONE OR MORE THAN ONE OPTIONS CORRECT TYPE

Topic:

Mechanics

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Question 15

1.2 sec

. The minim again is given by

$0.6 s$
$0.4 s$
$0.3 s$
$0.2 s$

Topic:

Waves & Oscillation

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Question 16

The S.H.M. of a particle is given by the equation

y = 3 sin ω t + 4 cos ω t

. The amplitude is

Topic:

Waves & Oscillation

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Question 17

The shortest time it takes to reach a point

\frac{A}{2} m

from its mean position in seconds is

$T$
$T /4$
$T / s$
$T /16$

Topic:

Waves & Oscillation

View solution

Question 18

A particle is executing simple harmonic motion with a period of

T

seconds and amplitude A A) metre. The shortest time it takes to reach a point

\frac{A}{2} m

from its mean position in seconds is

$T$
$T / L$
$T /8$
$T /16$

Topic:

Waves & Oscillation

View 2 solutions

Question 19

6. A plane mirror

OA

of length

2 m

is kept along the line

y = - x

as shown in the figure. An insect having velocity of

4 \hat{i} cm / s

is moving along the

x

-axis from far away. The time span for which the insect can see its image will be :-

Topic:

Optics

View solution

Question 20

PHY/R# 06 5. Two mirrors are inclined at an angle

θ

as shown in the figure. Light ray is incident parallel to one of the mirrors. The ray will start retracing its path after third reflection if :- 6. In the figure, a convex mirror of radius of curvature

20 cm

is shown. An object

O

is placed in front of this mirror. Its ray diagram is shown. How many mistakes are there in the diagram? (AB is its principal axis)

Topic:

Optics

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Class 8 Questions asked by Filo students

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