Download Physics sample paper 1 ICSE and more Exams Physics in PDF only on Docsity!
ICSE Board
Class IX Physics
Paper – 1
Time: 2 hrs Total Marks: 80
General Instructions :
_1. Answers to this paper must be written on the paper provided separately.
- You will_ not be allowed to write during the first 15 minutes. _This time is to be spent in reading the question paper.
- The time given at the head of the paper is the time allotted for writing the answers.
- Attempt_ all questions from Section I and any four questions from Section II_.
- The intended marks of questions or parts of questions are given in brackets [ ]._
SECTION I (40 Marks) Attempt all Questions from this Section Question 1 (a) Express one day in milliseconds. [2] (b) Why are the passengers' cabins in an aeroplane pressurized? [2] (c) What does a straight line graph signify? [2] (d) Following table gives the distance travelled by a particle at different times.
Time (s) 0 0.25 0.5 0.75 1 1.25 1. Distance (cm)
Draw a distance-time graph representing the motion of the particle. [2] (e) What will be the magnitude and direction of the reaction force acting on a coin of 10 g lying on the surface of the floor? Take g = 9.8 m/s^2 [2]
Question 2 (a) Distinguish between fundamental units and derived units. [2] (b) The earth attracts an apple. Does the apple also attract the earth? If it does, why does the earth not move towards the apple? [2] (c) An empty truck and a loaded truck are moving with the same velocity. On applying brakes, which truck will stop first and why? [2] (d) In cold countries, ponds freeze only at the surface. Why? [2] (e) Why do we wear woolen clothes in winter? [2]
Question 3 (a) Draw a graph of volume and temperature when 5 cm^3 of ice at - 10oC is heated to form water at 10oC. [2] (b) A brass disc is fitted strongly in a hole in a steel plate. What will you do (heat or cool)
with the system to loosen the brass disc from the hole? steel brass [2]
(c) Which mirror forms the image of a wider region? Also, give relevant figure. [2] (d) You have learnt that plane and convex mirrors produce virtual images of the objects. Can we get real images under some circumstances? How? [2] (e) Does the size of the mirror affect the nature of the image? [2]
Question 4 (a) Which properties are common in all types of mechanical waves? [2] (b) Two point objects, P and Q are situated in front of a plane mirror at distances of 15 cm and 30 cm respectively on the same straight line. Calculate the distance between the object P and the image of Q. [2] (c) Select the waves of the frequencies which will not be audible to human beings: 15 Hz, 250 Hz, 100 Hz, 30000 Hz. [2] (d) How will you obtain (i) small resistance and (ii) large resistance from a few given resistances? [2] (e) How will you test whether a given rod is made of iron or copper? [2]
Question 6 (a) An electron moving with the speed of 5 × 104 m/s enters into an electric field and attains a uniform acceleration of 10^15 m/s^2 in the direction of motion. In how much time, will it attain a speed twice of its initial speed? In this time, how much distance will it cover? [3] (b) [4] i. Explain with the help of an example whether the velocity or the acceleration of a body give the direction of motion. ii. In the given figure, velocity-time graph of a body moving in a straight line is shown. Find the displacement and the distance travelled by the body in 6 s.
(c) A body is projected vertically upwards with a velocity of 98 m/s. Find (i) the maximum height attained by the body and (ii) time taken by body to reach the highest point. Take g = 9.8 m/s^2 [3]
Question 7 (a) [4] i. State Newton's third law of motion. ii. John pushes a wall with a force of 20 N towards the east, what force will be exerted by the wall on John? iii. In the following figure, a block of weight 10 N is hanging from a rigid support by a thread. Find:
- The force exerted by block on the thread.
- The force exerted by the thread on the block.
(b) Mention three disadvantages of construction of large dams for generating hydroelectric power. [3] (c) A 3 kg stone is weighed first with a physical balance and then by a spring balance at the pole and at the equator. Where will the weight be maximum? [3]
Question 8 (a) Explain the effect of ozone depletion. [3] (b) [4] i. What is the use of thermos flask? ii. Draw a labeled diagram of thermos flask. iii. What contribution does the vacuum between the two walls give to the functioning of a thermos flask? iv. What is the function of the two shining walls of the glass vessel in the thermos flask? (c) A test tube made of ordinary glass cracks on plunging into boiling water whereas a red hot test tube made of fused silica can be safely plunged into normal water, why? [3] Question 9 (a) [4] i. Select the luminous objects from the following: Candle flame, stars, moon, red hot wire of heater, polished surface, and firefly. i. In a room, the light is not reaching directly, even then it is illuminated. Why? ii. What will be the colour of the sky for space travellers? (b) In what way, a point source should be placed in front of a concave mirror to get the parallel beam and the divergent beam. [3] (c) Compare the frequencies of two waves X and Y while velocity and wavelength of X are 5 × 103 m/s and 25 m respectively and for Y, 4× 103 m/s and 20 m respectively. [3]
Question 10 (a) A and B are two negatively charged and insulated conductors as shown in the figure. State, with reason, which conductor will tend to lose charge. [3]
(b) Draw a labelled diagram of Leclanche cell. Why is it not suitable for continuous use? [3] (c) [4] i. What is the general law of attraction and repulsion between magnetic poles? ii. What defines the direction of the magnetic field? iii. The middle region of a bar magnet is:
- A north pole
- A north seeking pole
- Unmagnetized
- Magnetized iv. Name two magnetic substances. 5
