Q. A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a :
1) converging lens
2) diverging lens
3) piano-converging lens
4) piano-diverging lens
Q. In a pressure cooker cooking is faster because the increase in vapour pressure:
1) increase the boiling point.
2) increase the specific heat.
3) decrease the specific heat.
4) decrease the boiling point.
Q. Magnets attract magnetic substances such as iron, nickel, cobalt etc. They can also repel:
1) paramagnetic substances
2) ferromagnetic substances
3) diamagnetic substances
4) non-magnetic substances
Q. Glass is actually:
1) a vitrifies liquid
2) a crystalline solid
3) an ionic solid
4) an elastic solid
Q. Solutions in test tubes containing H2O and aqueous NaOH can be differentiated with the help of:
1) red litmus
2) blue litmus
3) Na2CO3
4) HCl (aqueous)
Q. A student heated some sulphur in a spatula and collected the gas 'X'. Which one among the following is correct about 'X'?
1) X is SO2 and it turns moist litmus to blue
2) X is SO3 and it turns moist litmus to red
3) X is SO2 and it turns moist litmus to red
4) X is SO3 and it turns dry litmus to blue
Q. When concentrated H2SO4 spills on the surface, it should be immediately cleaned:
1) with a piece of cloth
2) by adding cold water
3) by adding solid Na2Co3
4) by adding solid BaCl2
Q. Which of the statements given below is/are correct?
1. chloride of calcium
2. bicarbonate of calcium
3. sulphate of magnesium
4. bicarbonate of magnesium
Select the correct answer using the code given below:
1) 1 and 3 only
2) 1 only
3) 2 and 4
4) 1, 2 and 3
Q. Which of the following statements about diamond are correct?
1. It is used as a gem in jewellery because of its ability to reflect light.
2. It is a good conductor of electricity
3. It is used for cutting glass, marble stones and other hard materials
4. It is used for drilling of rocks
Select the correct answer using the code given below:
1) 1, 3 and 4
2) 2, 3 and 4
3) 1, 2 and 3
4) 2 and 4 only
Q. Which one among the following methods is not effective in removing arsenic from contaminated ground water?
1) Boiling
2) Reverse osmosis
3) Ton exchange
4) Coagulation-adsorption
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