Which of the following is not an element ?

• Oxygen
• Nitrogen
• Hydrogen
• Marble
Correct Option: D  [ Marble ]

Remark:

When iron rusts, its weight __________

• decreases
• increases
• remains the same
• first increases and then decreases
Correct Option: B  [ increases ]

Remark:

Dialysis is prescribed for patients having:

• Liver disease
• Lung trouble
• Kidney trouble
• Heart Disease
Correct Option: C  [ Kidney trouble ]

Remark:

When an iron nail gets rusted, iron oxide is formed.

• without any change in the weight of the nail.
• with decrease in the weight of the nail.
• with increase in the weight of the nail.
• without any change in colour or weight of the nail.
Correct Option: C  [ with increase in the weight of the nail. ]

Remark: Rust is composed of iron oxide, which forms as a result of the reaction between iron, oxygen, and water.

In 1643, an Italian named Evangelista Torricelli invented:

• Thermometer
• Barometer
• Ritcher Scale
• Bar Codes
Correct Option: B  [ Barometer ]

Remark:

Which metal is present in haemoglobin?

• Iron
• Zinc
• Magnesium
• Copper
Correct Option: A  [ Iron ]

Remark: Iron is an essential element for blood production, and about 70 percent of your body's iron is in the red blood cells called hemoglobin.

Purity of milk is tested by:

• Electrometer
• Lactometer
• Radiometer
• Refractometer
Correct Option: B  [ Lactometer ]

Remark:

An endoscope is used by a physician to view the internal parts of a body organ. It is based on the principle of:

• refraction of light
• re?ection of light
• total internal re?ection of light
• dispersion of light
Correct Option: C  [ total internal re?ection of light ]

Remark:

Hydro?uoric acid is not kept in glass bottles because it reacts with:

• visible light
• sodium oxide of glass
• aluminium oxide of glass
• silicon dioxide of glass
Correct Option: D  [ silicon dioxide of glass ]

Remark:

Which of the following pairs is incorrect ?

(A) Roentgen : X-ray

(B) Newton : Law of gravitation

(C) Faraday : Diffusion of gases

(D) Pasteur : Bacteriology

• Roentgen : X-ray
• Newton : Law of gravitation
• Faraday : Diffusion of gases
• Pasteur : Bacteriology
Correct Option: C  [ Faraday : Diffusion of gases ]

Remark: