The catalyst used in the Hydrogenation of oil is

• Fe

• Ni

• MO

• Pt

We are not crushed under the weight of the atmosphere, because

• the pressure inside our body is less than atmospheric pressure

• the pressure inside our body is equal to the atmospheric pressure and cancels the pressure from outside

• the pressure inside our body is more than atmospheric pressure

• the pressure inside our body is more than atmospheric pressure and cancels the pressure from outside

113.

A block of iron dropped in a vessel of water, sinks to the bottom. This is because

• the weight of the block is less than the weight of the water displaced by the block

• the density of water is more than the density of the block

• the vessel is not deep enough to allow the block to float

• the weight of the water displaced by the block is less the weight of the block

Which one of the following statements is incorrect?

• Generally, the voice of a man is shriller than that of a woman

• A bird makes a high pitched sound whereas a lion makes a low pitched roar

• A drum vibrates with a low frequency, therefore it produces a low pitched sound

• A whistle has a high frequency and therefore it produces a sound of higher pitch

There are two planets in our solar system which rotate from East to West. These planets are

• Mercury and Venus

• Uranus and Neptune

• Mercury and Uranus

• Venus and Uranus

The major excretory product in human beings is

• uric acid

• ammonium chloride

• urea

• ammonia

You have two test tubes A and B. Test tube A contains a paste of turmeric whereas test tube B contains an aqueous solution of phenolphthalein. On adding a few drops of dilute hydrochloric acid to these test tubes the contents of

• A and B both would appear red

• A would appear red while those of B would remain colorless

• A would remain yellow while those of B would appear pink

• A would remain yellow while those of B would remain colourless

Anita prepared a fresh solution of sodium hydroxide in a test tube. She dropped a small piece of aluminum foil into it and then brought a burning matchstick near the mouth of the test tube. She hears a pop sound. The pop sound indicates the presence of

• hydrogen gas

• aluminum gas

• water gas

• oxygen gas

Which one of the following takes place when water transforms from liquid to gaseous phase?

• Distance between the particles change

• The color of the particles change

• Size of the particles change

• Structure of the particles change

Which fuel has the highest calorific value from among the following?

• Diesel

• Hydrogen

• Coal

• Petrol