The modulus of rigidity is the ratio of

• longitudinal stress to longitudinal strain

• volume stress to volume strain

• shearing stress to shearing strain

• tensile stress to tensile strain

Plasma membrane in eukaryotic cells is made up of

• phospholipid

• lipoprotein

• phospholiproprotein

• phosphoprotein

A concave lens always forms an image which is

• real and erect

• virtual and erect

• real and inverted

• virtual and inverted

52.

Which of the following is not a property of heavy water?

• Boiling point of heavy water is lower than that of ordinary water

• Density of heavy water is higher than that of ordinary water

• Freezing point of heavy water is higher than that of ordinary water

• It produces corrosion

Which one of the following is also called the 'power plants' of the cell?

• Golgi body

• Mitochondrion

• Ribosome

• Lysosome

The propagation of sound waves in a gas involves

• adiabatic compression and rarefaction

• isothermal compression and rarefaction

• isochoric compression and rarefaction

• isobaric compression and rarefaction

What is the chemical name of vinegar?

• Citric acid

• Acetic acid

• Pyruvic acid

• Malic acid

An atomic clock is based on transitions in

• sodium

• caesium

• magnesium

• aluminium

In which of the following processes is energy released?

• Respiration

• Photosynthesis

• Ingestion

• Absorption

Animals living in the tree trunks are known as

• arboreal

• volant

• amphibious

• aquatic