Q. 2.

(a) Define ceramic and nano-ceramic materials. Why do nano-ceramics show better properties than their ceramic counterparts? Write the applications of ceramic materials. (5)

(b) What is ‘Black Hole’? How are black holes formed and discovered? (5)

(c) Write two applications of each of the following electromagnetic radiations:

(i) Ultraviolet
(ii) Infra-red
(iii) Microwaves
(iv) Radio waves
(v) X-rays. (5)

(d) What is Wildfire? Explain its types, causes, spread and preventions. (5)

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Q. 3.

(a)

(i) Why are the bat and whale considered as mammals?

(ii) Write a note on liver juice ‘Bile’. (5)

(b) How is urine formed? Describe the role of kidney in excretion. (5)

(c)

(i) How is a bacterial cell different from a plant cell?

(ii) Why do you think cold-blooded animals are slowed down by low temperatures? (5)

(d) What is hepatitis, its types, causes, prevention, and cure? (5)

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Q. 4.

(a) What is the difference between fog and smog? What are the causes of smog and its effects on human health? Write a short note on any one of the latest technologies to eliminate smog to avoid atmospheric pollution. (5)

(b) What is the role of oxygen-demanding wastes in water pollution? How can it be prevented? (5)

(c) What is the biosphere? Write a note on the ‘Energy Resources’ available in the biosphere. (5)

(d) What are the different layers of the atmosphere? On what basis are these layers classified? In which layer are ‘Auroras’ formed and where do satellites orbit? (5)

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Q. 5.

(a) What are antioxidants and why are they used in foods? Write a short note on natural and synthetic antioxidants. (5)

(b) How are carbohydrates, proteins, and fats digested in humans? (5)

(c) How does the Navstar GPS system work for different applications? (5)

(d)

(i) Differentiate between network and internet.

(ii) What is the difference among application, program and software? (5)

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SECTION – B

Q. 6.

(a) A telephone company charges initially Rs. 0.50 and then Rs. 0.11 for every minute. Write an expression that gives the cost of a call that lasts N minutes. (5)

(b) Find the missing number in the series below:

(i) 1, 8, 4, 27, 9, ?

(ii) 3, 6, 8, 16, 18, ?

(iii) 2, 8, 512, ?

(iv) 81, 9, 64, 8, ?, 12

(v) 6, 11, 21, 36, 56, ? (5)

(c) The perimeter of the rectangle given below is 114 cm. Find the area of the rectangle. (5)

(d) Ahmad stands at point D, 2m in front of a spotlight at point A. He is 1.6m tall and is facing the wall of a building which is 10.5m away from him. How tall (BC) is his shadow on the wall of the building? (5)

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Q. 7.

(a) Ali is standing 10 meters away from a tree. The distance of his eyes from his feet is 1.5 meter. Given that the distance from his eyes to the top of the tree is 15 meters, find the height of the tree. (5)

(b) Find out the correct word from the jumbled spellings given below:

LNUGEF, CKANS, CIREFE, EERAANMOGTP, MNIKPPU. (5)

(c) Draw and write the total number of lines of symmetry in a regular hexagon and octagon. How many lines of symmetry are there in a circle? (5)

(d) The height of the Egyptian pyramid is 146.6 meters and a base length is 230.6 meters. Find the volume of that pyramid. (5)

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Q. 8.

(a) Ali buys an oven for Rs. 36800 and sells it at a gain of 8.5%. For how much does he sell it? (5)

(b) A card is drawn at random from a box containing 12 cards numbered 1, 2, 3, 4, 5, …., 12. Find the probability of drawing:

(i) ‘8’

(ii) an even number

(iii) a perfect square

(iv) a negative number

(v) a number less than 13. (5)

(c) The scintillation nuclear radiation detector detects the alpha rays per second. When the energy of the alpha rays (Eα) in MeV increases, the number of counts (Nc) on the detector also increases linearly as shown in the table below.

Draw the graph of Nc as a function of Eα (MeV) and find the energy of unknown alpha ray if the number of counts are 31600. (5)

(d) The y is directly proportional to x² and y = m for a particular value of x. Find an expression for y in terms of m, when this value of x is doubled. (5)

(20)

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