ICSE CLASS 8 PHYSICS SAMPLE PAPER – 2
ICSE Board Class VIII
Physics Sample Paper – 2
Time: 2 Hrs Total Marks: 75
General Instructions:
-
All questions are compulsory.
-
Questions 1 to 15 carry one mark each.
-
Questions in 2 A and 2 B carry one mark each.
-
Questions in 3 A and 3 B carry one mark each.
-
Question 4 A and 4 B carry five marks each.
-
Question 5 A and 5 B carry five marks each.
-
Question 6 A and 6 B carry five marks each.
-
Question 7 A and 7 B carry five marks each.
Q 1:
Q1. Choose the correct answer out of the four available choices given under each question. 15
-
The current which changes its direction after fixed intervals of time is called
(a) Direct current
(b) Changing current
(c) Alternating current
(d) Varying current
-
Where should we place an object in front of a convex lens to get a real image which is the same size as the object?
(a) At the principal focus of the lens
(b) At twice the focal length
(c) At infinity
(d) Between the optical centre of the lens and its principal focus
-
What is the Indian name of the constellation ‘Ursa Major’?
(a) Vyadha
(b) Vrischika
(c) Simha
(d) Saptarishi
-
Potential energy is the energy possessed by an object due to its
(a) Position
(b) Motion
(c) Speed
(d) Mass
-
If the refractive index of two media are equal, then
(a) Light will reflect in the same medium
(b) Interface will absorb the light
(c) No refraction will occur
(d) It will bend away from the normal
-
The elevation in the central part of the retina of a human eye is called
(a) Blind spot
(b) Yellow spot
(c) Fovea centralle
(d) Green spot
-
The commercial unit of electric energy is
(a) kilowatt-hour
(b) watt
(c) joule
(d) joule-hour
-
The instrument used for measuring the density or relative density of liquids is known as
(a) Spherometer
(b) Hydrometer
(c) Buoyancy meter
(d) Barometer
-
The loud sound heard during lightning is called
(a) Lightning streak
(b) Cloud burst
(c) Thunder
(d) Sonic burst
-
As we go higher into the atmosphere the density of air
(a) Gradually increases
(b) Gradually decreases
(c) Remains the same throughout
(d) Initially decreases and then increases
-
The temperature at which water vapourises into steam is called
(a) Boiling point
(b) Melting point
(c) Freezing point
(d) Condensation temperature
-
Surface tension has the dimensions of
(a) Force
(b) Force per unit area
(c) Force per unit length
(d) $text { Force } times text { length }$
-
In a uniform magnetic field, the field lines are
(a) Curved
(b) Parallel equidistant straight lines
(c) Parallel but non-equidistant straight lines
(d) None of the above
-
How many constellations are officially recognised by the International Astronomical Union?
(a) 76
(b) 88
(c) 108
(d) 95
-
The work done in moving a charge of 5 C across the potential difference of 10 V is
(a) 50 J
(b) 2 J
(c) 0.5 J
(d) 25 J
Q 2.
[A] Match the columns and rewrite them correctly. 5
[B] Fill up the blanks and rewrite the sentences: 5
-
A ________ image cannot be seen on a screen.
-
Coal, petroleum and natural gas are _________ fuels.
-
The ______ controls and regulates the amount of light entering the eye.
-
The effect of a force acting vertically downwards on a unit area is called _________.
-
In a series combination, the ________ is same across all the resistances.
Q 3.
[A] State whether the following statements are True or False. Correct the false statement and rewrite it. 5
-
A rubber cork experiences the same upward thrust when immersed in oil and turpentine.
-
Myopia is also called far-sightedness.
-
Hydropower plants convert kinetic energy to electricity.
-
The layer above the chronosphere is called the photosphere.
-
Tents do not remain water-proof when we touch them.
[B] Give reasons for the following.
-
Stars appear to us like point objects.
-
A compass ne
edle placed near a current carrying conductor shows deflection. -
The snow on mountains does not melt as a whole.
-
Objects feel lighter when in water than outside it.
-
A pool of water appears to be less deep than it actually is.
Q 4.
[A]
-
Explain transfer of heat by conduction. 3
-
How do ciliary muscles affect the functioning of the eye? 2
[B]
-
What energy transformations are taking place in the following examples? 2
(a) Electric motor
(b) Burning of wood
-
Answer the following: 3
(a) Define: Valence electrons.
(b) When can you say that an atom becomes negatively charged?
(c) When can you say that an atom becomes positively charged?
Q 5.
[A]
-
Define the following: 2
(a) Optical Centre
(b) Principal Axis
-
Describe the Milky Way galaxy. 3
[B]
-
Answer the following: 3
(a) What are magnetic field lines?
(b) Draw field lines when two bar magnets are placed with their like poles facing each other.
(c) List any two properties of magnetic field lines.
-
Two coils 1 and 2 of insulated copper wire having large but different number of turns are wound over a cardboard cylinder. Coil 1 is connected to battery and a plug key. Coil 2 is connected to a galvanometer. How will the galvanometer reading change when
(a) key is plugged in?
(b) key is taken out?
Give reasons for your answers. 2
Q 6.
[A]
-
Why do different colours of light deviate differently in a prism? 2
-
Draw a ray diagram to show the formation of an image, when the object is placed between the optical centre and the principal focus of a convex lens. 3
[B]
-
A rectangular block of dimensions 25 cm, 25 cm, 15 cm weighs 25 N. What will be the pressure exerted by its largest face on the surface? 2
-
Find the equivalent resistance when three resistances of $3 Omega, 6 Omega text { and } 9 Omega$ are connected in:
3
(a) Series
(b) Parallel
Q 7.
[A]
-
Answer the following: 3
(a) What is heat?
(b) Describe sea breeze.
-
Find out the quantity of heat produced in a resistance of $10 Omega$ when a current of 2 A is supplied to it for 8 minutes. 2
[B]
-
What is the distance of a star in light years, if it is at a distance of 20 parsec? 2
-
What is meant by the relative density of a substance? What is its significance? The relative density of mercury is 13.6. What is its density in S.I.? Units? (Density of water = $1000 mathrm{~kg} / mathrm{m}^{3}$) 3 &
nbsp;
