On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C because

• metals have higher thermal capacity than plastics

• plastics have a lower density than metals

• metals are good conductors of heat

• metals are good conductors of heat

Which of the following is used to protect objects in computer system, in the absence of more complete protection schemes?

• Digital certificate

• Digital signature

• Passwords

• Passwords

Electromagnet is constructed with which of the following?

• Steel

• Soft iron

• Aluminium

• Aluminium

What is the product formed when sodium bicarbonate is heated strongly?

• Sodium Carbonate

• Sodium Hydroxide

• Sodium Peroxide

• Sodium Peroxide

Super cooling stands for cooling of a liquid

• at freezing point

• below freezing point

• at melting point

• at melting point

Which method will be employed to test the hardness of water?

• Boiling

• Distillation

• Formation of lather with soap

• Formation of lather with soap

Two electrons in an orbital are differentiated by which of the following?

• Magnetic quantum number

• Spin quantum number

• Principal quantum number

• Principal quantum number

Alchohol is more volatile than water because __________ is lower than water.

• its boiling point

• its density

• its viscosity

• its viscosity

Which of the following is not soluble in water?

• Lead Sulphate

• Zinc Sulphate

• Potassium Sulphate

• Potassium Sulphate

Of the following commonly used materials, the one that is not an alloy is

• Steel

• Brass

• Bronze

• Bronze