"OM Sai Ram"
Spectrum
Classes
Class IX Physics
Time:1:30Hrs
Max
Marks:50
Instructions:
(i)
All questions are compulsory.
(ii)
There are 20 questions in total. Questions 1 to 5 are very short answer type
questions
and
carry one marks each.
(iii)
Questions 6 to 11 carry two marks each, questions 12 to 16 carry three marks each
and
questions 17 value based question 3
marks and 18 to 20 carry five marks
Q.1 A person observes the smoke
from a gun 1. 4 sec before he hears the bang. If the gun is 476 m away from the
person, find the speed of sound?
Q.2 A 5 Kg Cart is pushed by a 30 N force against friction for a distance
of 10m in 5
seconds. Determine the Power needed to move the
cart.
Q.3Why
Ice float on water? give reason .
Q.4 A source of wave
produces 40 crests and 40 troughs in 0.4sec .Find the frequency
of
the wave.
Q.5 A body is vibrating 6000
times is 1 minute. If the velocity of sound in air is 360 m/s, find (a) (i) Frequency in Hz (ii)
wavelength of sound.
Q.6
What is
buoyancy and buoyant force? Upon what factors do they depend
Q.7
Why does water pressure increase as the depth of the water increases?
Q.8 In a spring balance the space
between 0 and 25 g marks is divided into 10 equal parts. Calculate the least
count of spring balance.
Q.9
Write Energy Conversion in (a) Motor (b) Dynamo (c) Solar Cell (d) Wind Mill
Q.10 A solid weighs 80 g in air,
64 g in water. Calculate the relative density of solid. When kept in water,
state if the object would float or sink?
Q.11 A body of mass 400g has a
volume of 300cm3. State whether the body will sink or float in
water. Give reason.
Q.12 A hammer of mass 1kg falls
freely from a height of 2 m .Calculate (I) The velocity and (II) The KE. Of the
hammer just before it touches the ground. Does the velocity of hammer depend on
the mass of hammer?
Q.13 Define Commercial unit of
energy and Derive its Relation with SI
unit .
Q.14
Write two Uses of Ultrasound in Medical Science
& in Industry .
Q.15
Prove mathematically that the change in kinetic energy is equal to work done.
Q.16Write
three Difference between (a) Longitudinal & Transverse wave (b) Pitch & Loudness
Q.17
Ravi’s Dairy Business is affected due to adding of water in milk by various
milk sellers , his son Ram give him a device by which he can easily identify
water in milk , Name the device & on
which principle does it work Explain .(Value
Based Question )
Q.18 Explain ECHO with its
Condition , A bat emits ultrasonic wave of frequency 30 Khz..If its speed is
350m/s and bats hear its echo after 0.6 sec after emitting the , find how far
is bat from obstacle and wavelength of wave?
Q.19 Define (a) Tone
(b) Note (c) Noise & Explain
the working of SONAR with its diagram .
Q.20
State & Prove law of Conservation of Energy with the example of a pendulum
.
Spectrum Classes By Er.Shyam Pachori CL 157 D.D Nagar Mob.:9039803981
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