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Solution for Class 9, Science, Physics

Question 1

7. A train starting from a railway station and moving with uniform acceleration attains a speed

60 km / min

. Find its acceleration. 8. A trolley, while going down an inclined plane, has an acceleration of

10 m / s^{\land} 2

. What distance will it cover in

20

minutes after start? 9. A motorboat starting from rest on a lake accelerations in a staright line at a constant rate of

3 m / s^{\land} 2

for 8 second. How far does the boat travel during this time?

Topic:

Physics

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Question 2

A man weighs

600 N

at earth's surface. At what height above the earth's surface his weight becomes

300 N

? (Radius of earth

= 6400 km

)

$1624 km$
$2424 km$
$2826 km$

Topic:

Physics

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Question 3

At what height, is the value of

g

half that on the surface of earth? (

R =

radius of the earth)

$0.414 R$
$R$
$2 R$
$3.5 R$

Topic:

Physics

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Question 4

A planet of mass

m

moves around the sun of mass

M

in an elliptical orbit. The maximum and minimum distances of the planet from the sun are

r_{1}

and

r_{2}

respectively. The time period of the planet is proportional to :

$r_{1}^{3/2}$
$r_{2}^{3/2}$

Topic:

Physics

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Question 5

b. A convex mirror has a focal length of

18 cm

. The image of an object kept in front of the mirror is half the height of the object. What is the distance of the object from the mirror?

Topic:

Physics

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Question 6

Weight of a body of mass

20 kg

(g = 10 m / s^{2})

$20 N$
200 dynes
$20 kgf$
$200 gwt$

Topic:

Physics

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Question 7

Multiple Choice Questions Question 1.B-horizon is also called as

topsoil
subsoil
parent rock
none

Topic:

Physics

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Question 8

Question 2.Availability of water and minerals in the soil for maximum absorption by roots is in the

B-horizon
C-horizon
A-horizon
Surface of soil

Topic:

Physics

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Question 9

Question 3.Manure is added into the soil

to increase water holding capacity
to increase size of soil particle
to make it well aerated
to drain water from it

Topic:

Physics

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Question 10

Question 4.The soil that can be moulded into any shape is

silt
sandy
loamy
clayey

Topic:

Physics

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Question 11

Question 5.Percolation rate is measured in unit

$mL / min$
$min / mL$
$lit / min$
$mL / sec$

Topic:

Physics

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Question 12

Question 6.Soil absorbs water due to its

compactness
porosity
hardness
dryness

Topic:

Physics

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Question 13

Question 7.The plants that grow on the surface of earth are called

vegetation
fertile land
crop
greenery

Topic:

Physics

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Question 14

PRAC C C 1. Which one of the following statements is correct regarding the velocity of sound?

It does not depend upon the nature of media
It is maximum in gases and minimum in tiquids
It is maximum in solids and minimum in liquids
It is maximum in solids and minimum in gases

Topic:

Physics

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Question 15

The ceilings of a concert hall are generally curved because

they reflect the sound to the audience.
they can absorb noise
it better aeration in the hall
as any sound from outside cannot pass through a curved ceilling.

Topic:

Physics

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Question 16

A human heart beats 72 times in a minute. Its frequency will be

$1.9 Hz$
$1.2 Hz$
$2.5 Hz$
$8.2 Hz$

Topic:

Physics

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Question 17

If sound of lightening is heard after 12 seconds of lightening, then distance of observation of sound from the place where lightening occurs, is [Given, speed is sound

= 330 m / s

]

$1980 m$
$2970 m$
$3960 m$
$1485 m$

Topic:

Physics

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Question 18

Loudness of sound can be increased by

increasing frequency.
decreasing frequency.
increasing amplitude
decreasing amplitude.

Topic:

Physics

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Question 19

A sound wave has frequency of

2 kHz

and wavelength of

35 cm

. If an observer is

1.4 km

away from the source. At what time interval could the observer hear the sound?

$2 s$
$20 s$
$0.5 s$
45

Topic:

Physics

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Question 20

Example 11.7 Two girls, each of weight 400 N climb up a rope through a height of 8 m. We name one of the girls

A

and the other B. Girl A takes

20 s

while B takes

50 s

to accomplish this task. What is the power expended by each girl?

Topic:

Physics

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Solution for Class 9, Science, Physics

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