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The hardness of the bone tissue is due to the phosphates and carbonates of which of the following pairs of elements?

1. A calcium and potassium
2. B calsium and magnesium
3. C calsium and sodium
4. D magnesium and sodium

Which one of the completed the 100th anniversary of its discovery in 1995?

1. A detergents
2. B diesel engine
3. C photography
4. D X-rays

Acquired Immune Deficiency Syndrome (AIDS) is caused by

1. A Bacteria
2. B Fungus
3. C None of the above
4. D Virus

Which of the following is the working principle of a washing machine?

1. A centrifugation
2. B dialysis
3. C diffusion
4. D reverse osmosis

How many Ergs are there 1 Joule?

1. A 10^2
2. B 10^4
3. C 10^6
4. D 10^7

Which is the longest day in the year?

1. A 21 July
2. B 21 June
3. C 21 September
4. D 22 November

Which of the following is not a radio active metrial?

1. A plutonium
2. B radium
3. C sodium
4. D uranium

The lower, dense region of the atmosphere is known as--

1. A hydrosphere
2. B inosphere
3. C stratosphere
4. D troposphere

Decible is unit of--

1. A Electricity
2. B Heat
3. C Light
4. D Sound

Which of the following has an organic origin?

1. A bakelite
2. B coal
3. C nylon
4. D sand

Farmers can keep their soil fertile by--

1. A Crop rotation
2. B Irrigation
3. C Regular tilling
4. D Repeatedly growing the same crop

The three methods of science are observation, experimentation and ----.

1. A deduction
2. B hypothesis
3. C inference
4. D measurement