UNIQUE SCIENCE ACADEMY

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1 1 (a) UNIQUE SIENE EMY Test (Unit 7) Name :... Paper: Physics ate : ode: 5054 lass: I Time llowed: 35Minutes Maximum Marks: 25 1 Theory Section: What do you understand by the term pressure. [Total 16 Marks] Mention its SI unit also. [2] (b) In the space below draw a labelled diagram of a simple barometer. What measurements will be taken to measure the atmospheric pressure. [6] (c) What changes will be observed if a narrower tube was used and a less dense liquid like water is used instead of mercury. [2] [Total 10] edicated to My Son Mohammad Irtaza Haider Zain. ode 5054 [Turn over

2 2 2 Fig. 2.1 shows a manometer used to measure the pressure difference between the air inside a plastic container and the atmosphere outside. platform area 0.1 m 2 force F cm manometer flexible plastic container h metre rule 20 air 10 water Fig. 2.1 pressure difference of 100 Pa causes a one centimetre difference in water levels. (a) Using Fig. 2.1, determine the pressure difference in Pa shown by the manometer. (b) (c) State what changes, if any, occur to the distance h in Fig. 2.1 if (i) (ii) the manometer tube is narrower, pressure difference =...Pa [1] a liquid denser than water is used in the manometer. [2] The pressure difference measured by the manometer is caused by the force F. This force is the weight of a student standing on the platform. The cross-sectional area of the platform is 0.1 m 2. (i) (ii) State the formula that relates pressure, force and area. alculate the weight of the student. weight =... [3] [Total 6] edicated to My Son Mohammad Irtaza Haider Zain. ode 5054 [Turn over

3 1 MQ SETION: 3 [Total 9 Marks] The system shown in the diagram contains an incompressible liquid. downward force of 80 N is exerted on the piston K. 80 N piston K area 40 cm 2 piston L area 2 cm 2 2 liquid What will be the upward force on piston L? 1N 4N 80 N 1600 N The diagram shows a simple mercury barometer. Which height is a measure of the atmospheric pressure? 3 The diagram shows a glass block resting on a table top. area X of block area Y of table top The area of the block in contact with the table is X and the area of the table top is Y. The weight of the block is P and the weight of the table is Q. Which expression gives the pressure exerted on the table by the block? P P Q Q X Y X Y edicated to My Son Mohammad Irtaza Haider Zain. ode 5054 [Turn over

4 4 4 The diagram shows the levels X and Y in a liquid manometer when the gas tap is opened. gas from cylinder tap Y 9 cm 9 cm X liquid What is the pressure of the gas in the cylinder? 5 18 cm of liquid below atmospheric pressure 9 cm of liquid below atmospheric pressure 9 cm of liquid above atmospheric pressure 18 cm of liquid above atmospheric pressure The diagrams show, to the same scale, the vertical sections of a set of circular vessels. Each vessel contains the same depth of water. P Q R S Which of the following statements is correct? The water exerts the greatest pressure on the base of vessel P. The water exerts the greatest pressure on the base of vessel S. The water exerts the same force on the base of each vessel. The water exerts the same pressure on the base of each vessel. edicated to My Son Mohammad Irtaza Haider Zain. ode 5054 [Turn over

5 5 6 gas is trapped inside a cylinder by a movable piston. The length of the gas column is 50cm and the pressure inside the cylinder is p. 50 cm p gas The piston is pushed in a distance of 30 cm, so that the length of the gas column is now 20 cm. The temperature of the gas does not change. What is the new pressure of the gas? 0.4 p 0.6 p 1.5 p 2.5 p 7 Which statement about the pressure in a column of liquid is correct? It acts only vertically downwards. It increases if the column width increases. It increases with depth in the column. It is uniform throughout the column. 8 n airtight container holds a fixed quantity of gas. Its pressure and volume are measured on four occasions when the temperature is 20. The results are shown in the table. Which set of readings is incorrect? pressure / kpa volume / cm edicated to My Son Mohammad Irtaza Haider Zain. ode 5054 [Turn over

6 6 9 builder leaves two identical, heavy, stone tiles resting on soft earth. One is vertical and the other is horizontal. fter a few hours, the vertical tile has started to sink into the soft earth, but the horizontal one has not. Which row correctly compares the forces and the pressures that the tiles exert on the earth? forces pressures different different different same same different same same MQ nswer Sheet edicated to My Son Mohammad Irtaza Haider Zain. ode 5054

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