Our bones and teeth are generally made of

• Tricalcium phosphate
• Fluoropetite
• Chloropetite
• Hydrolith
Correct Option: A  [ Tricalcium phosphate ]

Remark:

Oxygen liberated during photosynthesis comes from:

• water
• carbon dioxide
• glucose
• Both carbon dioxide and glucose.
Correct Option: A  [ water ]

Remark:

The isotope used for the production of atomic energy is:

• U-235
• U-238
• U-234
• U-236
Correct Option: A  [ U-235 ]

Remark:

Which of the following statements is correct ?

• Protons are negatively charged and are present in the nucleus
• Electrons are positively charged and are present in the nucleus
• Electrons are negatively charged and are present in the orbits
• The entire mass of atom is distributed in the orbits
Correct Option: C  [ Electrons are negatively charged and are present in the orbits ]

Remark:

Average distance of the earth from the Sun is:

• 150 Million km
• 15 Million km
• 90 Million km
• 900 Million km
Correct Option: A  [ 150 Million km ]

Remark:

Cobalt-60, commonly used in radiation therapy, emits :

• Alpha rays
• Beta rays
• Gamma rays
• X-rays
Correct Option: C  [ Gamma rays ]

Remark:

A substance used in the fire extinguisher under the trade name of Pyrene is:

• Carbon dioxide
• Chloroform
• Carbon tetrachloride
• Bleaching powder
Correct Option: C  [ Carbon tetrachloride ]

Remark:

In a society the growth and development that meets the current human needs and also conserves natural resources for future generations is known as:

• Green economy
• Holistic development
• Sustainable development
• Subsistence agriculture
Correct Option: C  [ Sustainable development ]

Remark:

The disease caused by Asbestos is

• Paralysis
• Dysentery
• Emphysema
• Diarrhea
Correct Option: C  [ Emphysema ]

Remark:

Pituitary gland is located in

• brain
• kidney
• liver
• intestine
Correct Option: A  [ brain ]

Remark: