81.

Herman Hollerith had perfected his tabulating system and developed a machine called

• tabulation engine

• analytical engine

• census tabulator

• census tabulator

DBMS used for building computer applications stands for

• Database Machine System

• Database Maintenance System

• Database Management System

• Database Management System

Iodine test is used to detect

• carbohydrate

• protein

• fat

• fat

Which of the following is used in pencils?

• Graphite

• Sulphur

• Phosphorus

• Phosphorus

The branch of medicine involving synthetic chemical compounds is

• ayurveda

• allopathy

• homoeopathy

• homoeopathy

The rusting of metal iron in air needs both

• oxygen and moisture

• carbon dioxide and moisture

• water and paint

• water and paint

Arsenic problem in India is primarily due to

• overexploitation of arsenopyrite in the hinterland

• overexploitation of coal in Bihar and Bengal

• overexploitation of ground water in the affected areas

• overexploitation of ground water in the affected areas

Acid rain is caused by

• Co and CO

• SO₂ and O₂

• SO₂ and NO₂

• SO₂ and NO₂

Absorption of water from cut ends of stems disproves the

• Theory of capillarity

• Cohesion tension theory

• Root Pressure theory

• Root Pressure theory

The loss of water in the form of water droplets is called

• transpiration

• guttation

• evaporation

• evaporation