PHYSICS
Std: IX (ICSE) Time :
2 hour
Marks :
80
SECTION - A
(Attempt
all questions from this Section.)
QUESTION
1 [15]
(i)
The
magnitude of a physical quantity is 8 N s. the physical quantity is:
a) Force
b) Linear momentum
c) Impulse of force
d) Rate of change of momentum
(ii)
Altimeters are used in aircrafts to measure:
a) Atmospheric pressure
b) Altitude of a place
c) Temperature of a place
d) None of these
(iii)
Find the odd
one out
a) Joule
b) Kelvin
c) Calorie
d) Kilocalorie
(iv)
If the
angle between incident ray and reflected ray 1700 the angle
of reflection is:
a) 170
b) 70
c) 100
d) 85
(v)
The image
formed in a spherical mirror has magnification -5. The image is:
a) Real and erect
b) Real and inverted
c) Virtual and erect
d) Virtual and inverted
(vi)
The longitudinal
waves can propagate in:
a) Solids
b) Liquids
c) Gases
d) All of these
(vii)
Which of
these is added in parallel in an electric circuit?
a) Cell
b) Voltmeter
c) Ammeter
d) Galvanometer
(viii) A uniform magnetic field is represented
by
a) Continuous curve
b) Perpendicular lines
c) Parallel lines
d) None of these
(ix)
Motion of a
fish in water is an example of:
a) Newton’s first law of motion
b) Newton’s second law of motion
c) Newton’s third law of motion
d) None of these
(x)
Atmospheric
pressure ______ as we go to Alps in Switzerland.
a) Increases
b) Decreases
c) Does not change
d) First increases then decreases
(xi)
An example
of greenhouse gas is:
a) Nitrogen
b) Oxygen
c) Carbon monoxide
d) Carbon dioxide
(xii)
Dog
trainers use special Galton whistle to train the dogs as they produce:
a) Special sound wave
b) Infrasonic sound
c) Ultrasonic sound
d) Normal audible sound
(xiii) The
diameter of a spherical mirror is 20 cm, calculate its focal length;
a) 10 cm
b) 5 cm
c) 15 cm
d) 20 cm
(xiv) The unit of current is:
a) Ammeter
b) Ampere
c) Volt
d) Joule
(xv)
Electromagnets are made of;
a) Silver
b) Copper
c) Steel
d) Soft iron
QUESTION 2
(i)
Magnetic
lines of force travel
from _____(North/South) to _____ (North/South) outside the magnet. [2]
(ii)
A voltmeter
is always connected in _____ in a circuit. (series/parallel) [1]
(iii)
A dentist
uses _____ mirror to test tooth decay. (convex/concave) [1]
(iv)
The sound
heard by a train passing by is maximum during _____ (winter/summer) and minimum
during _____ ((winter/summer)). [2]
(v)
Draw the
graphical representation of variation of density with temperature. [2]
(vi)
what will
be the future consequences of global warming. [2]
QUESTION 3
(i)
State the
purpose of using the following in an electric circuit. [4]
(a) Galvanometer
(b) Rheostat
(c) Load
(d) AC generator
(ii)
Why do we
use a convex mirror as a rear-view mirror? [2]
(iii)
Copy and
complete the following ray diagram to obtain the image of the object AB kept in front of the concave
mirror. [3]
(iv)
Study the
diagram and determine the polarities at the ends A, B, C and D.
[2]
(vii)
How do the
following factors affect the speed of sound in air?
a) Amplitude
b) Humidity
c) Pressure
d) Temperature [4]
SECTION - B
(Attempt any four questions.)
QUESTION 4
(i)
To
accelerate an object to a rate of 2 m/s 10 N force is required. Find the mass
of the object. [2]
(ii)
State
universal law of gravitation. Also write its mathematical equation. [3]
(iii)
A force of
60 N acts on a body of mass 10 kg initially at rest such that it gains a
velocity 24 m/s. Find;
a) Initial momentum
b) Final momentum
c) Change in momentum
d) Time required to gain the velocity [5]
QUESTION 5
(i)
The diagram
below shows a frozen pond in a cold region.
a) State the expected temperatures at A and B. [2]
b) Name the phenomenon responsible for these
temperatures mentioned in part (a). [1]
c) How aquatic creatures preserved in lakes during
winter in cold countries? Explain. [3]
(ii)
How does
the liquid pressure on a diver change if; [2]
a) The diver moves to the greater depth.
b) As diver moves horizontally.
(iii)
Explain why
a gas bubble released at the bottom of a lake grows in size as it rises to the
surface of the lake. [2]
QUESTION 6
(i)
An object
is placed at 12 cm distance in front of a concave mirror of focal length 8 cm.
a) Find the position of the image.
b) What will be the nature of the image? [4]
(ii)
A concave
mirror produces a real image of height 4 cm of an object 0.5 cm high.
a) Find the linear magnification.
b) What will be the nature of the image? [4]
(iii)
Why is a
convex mirror preferred as a reflector in a street lamp? [2]
QUESTION 7
(i)
The speed
of sound in air is 320 ms-1 and in water it is 1600 ms-1.
It takes 5 s for sound to reach a
certain distance from the source placed in air.
(a) Find this distance. [2]
(b) How much time will it take for sound to
travel the same distance when the source is in water? [2]
(ii)
A source if
sound produces 500 compressions and 500 rarefactions in air in 30 s. Find the:
a) Frequency of the sound.
b) Wavelength of the sound.
(given: speed of sound in air is 330 m/s) [4]
(iii)
Why is the
flash of lightening seen first than the sound of a thunderstorm? [2]
QUESTION 8
(i)
Study the
diagram below and answer the following questions. [4]
(a) Identify the electrical components labelled
A, B and C.
(b) State whether the circuit given below is
open or closed.
(ii)
The current
flowing through a conductor for 2 min is 10 A. find the
charge
flowing on it. [3]
(iii)
How much
work is done in moving a charge of 5 C across two points
with a potential difference of 6 V. [3]
QUESTION 9
(i)
The
diagrams below show pins suspended from the same magnet to their maximum limit
in two different cases.
a) State with a reason whether the set of pins A
or the set of pins B are made out of soft iron. [3]
b) define the magnetic process which enables us to
suspend the pins one below the other. [2]
(ii)
draw
diagram showing the arrangements of lines of force for:
a) A single magnet.
b) Two magnets in line with unlike poles facing
each other. [3]
(iii)
Why are
artificial magnets preferred over natural magnets? [2]
