Q1. Write short notes on any TWO of the following: (5 each)
(a) Communication Satellite
(b) Geo-thermal Energy
Q2. Write short notes on the life and work of the following: (5 each)
(b) Ibn Al - Haitham
Q3. Name: (1 each)
(a) The alloy which consists of copper and tin.
(b) The device used to measure radioactivity.
(c) The organ in (the human body which is responsible for the digestion of protein only
(d) The instrument used to measure very high temperature.
(e) The scientist who designed the first internal combustion engine used to burn low grade fuel.
(f)The scientist who asserted the earth to be a huge magnet.
(g) The metal known as quick silver.
(h) The device which converts the chemical energy into electrical energy.
(i) The first person to orbit the earth in space.
(j) The scientist who discovered water.
Q4-Write briefly about any FIVE of the following: (2each)
(a) Shock Waves
(b) Sound Barrier
(c) Solar Cell
(d) Super Fluid
(f) Photovoltaic Cell
Q5. Which physical quantities are measured by the following units? (1 each)
Q6. How do our domestic and industrial activities pollute water? Explain with reference to two important industries of Pakistan. (5,5)
Q7- Which of the following statements are True and which are False: (1 each)
(a) To stay in the sunlight while circling the globe at the equator, one has to move with a speed of 1670 km/hour.
(b) Infrared waves have more wavelengths than the red color.
(c) liver produces bile which is involved in the breakdown of fats.
(d) A secondary cell can be charged again.
(e) Nucleic acids are responsible basically for protein synthesis in the human body,
(f) The quality of gasoline is checked by its octane number.
(g) image in a plane mirror is not laterally inverted.
(h) Horse power is the unit of mechanical energy.
(i) Sound travels faster in vacuum than in water.
(j) Nitrogen is the most occurring element in the human body.
Q8. Differentiate between the following pairs. (2 each)
(a) Radiotherapy & Chemotherapy
(b) Penumbra & Umbra
(c) Springtides & Neaptides
(d) Vertebrates &. Invertebrates
(e) Fluorescent light & Neon signs
Q9. Fill in the blanks: (1 each) '
a)The variation in the blood flow can be heard with an instrument called __
b)There is a place in the retina where the light sensitive cells are interrupted by the presence of the optic nerve head. It is known as __
(c) The study of human population is called __.
(d) Human beings belong to species called ___ .
(e) defect of eye due to which nearly located objects arc not clearly visible is called __ .
(f) About _ __ _ of the human body consists of water.
(g) All of the oxygen that you breathe has been produced by the splitting of water during __ ___.
(h) The important ore of Chromium is _.
(i) _ __ acid was discovered by Jabbar bin Hayyan.
(j) The measurement of rainfall is made by an instrument known as _.
Q10. What are the main reasons of water - logging in Pakistan? How does a tube-well reclaim a water logged soil? (5,5)
Q11 . Give scientific reason of the following: (2 each)
(1) Pole star is always seen in the north.
(2) We never see birds urinating.
(3) Pasteurized milk has more nourishment than the ordinary boiled milk.
(4) Bees die when they sting human beings.
(5) Cloudy nights are usually warmer than the clear ones.
Q12. What are Nuclear reactors? How the Electrical energy is produced by Nuclear Power Plants? Name the devices which convert
(1) Mechanical energy into electrical energy
(2) Heat energy into mechanical energy
(3) Electrical energy into mechanical energy
(4) Electrical energy into sound energy
(5) Sound energy into electrical energy
Q13. What do the following scientific abbreviations stand for: (1 each)
Q14-Compare the columns A and B and write the correct answer from the Column to the Column A (serial wise) in Column C,
10. Solar Energy
1. Sulphur dioxide
3. Aqua regia
4. Beta - Particle
6. Calcium Carbonate
7. Dobson Units
8. Silicon dioxide
9. Total internal
10. Blue purple light