The element common to all acids is :

• Oxygen
• Hydrogen
• Nitrogen
• Sulphur
Correct Option: B  [ Hydrogen ]

Remark:

Ocean thermal energy is due to:

• tides in the ocean
• pressure difference at different levels in the ocean
• temperature difference at different levels in the ocean
• energy stored by waves in the ocean
Correct Option: C  [ temperature difference at different levels in the ocean ]

Remark:

Which of the following statements is not correct ?

• Rh⁺ person can donate blood to Rh⁺ person
• Rh^- person can donate blood to Rh^- person
• Rh^- person can donate blood to Rh⁺ person
• Rh⁺ person can donate blood to Rh^- person
Correct Option: D  [ Rh⁺ person can donate blood to Rh^- person ]

Remark:

Nucleus is absent in

• Erythrocyre (Red Blood Cell)
• Cancer cell
• Stem cell
• Leucocyte (White Blood Cell)
Correct Option: A  [ Erythrocyre (Red Blood Cell) ]

Remark:

Dialysis is prescribed for patients having:

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

Remark:

Which of the following is an example of thermoplastics?

• Bakelite
• Melamine
• PVC
• none of these
Correct Option: C  [ PVC ]

Remark:

Which of the following is not correctly matched ?

• Becquerel : Radioactivity
• Alexander Flaming : Penicillin
• Louis Pasteur : Blood groups
• William Harvey : Blood circulation
Correct Option: C  [ Louis Pasteur : Blood groups ]

Remark:

Aryabhatta was a famous ________ of ancient India.

• Doctor
• Poet
• Physicist
• Mathematician
Correct Option: D  [ Mathematician ]

Remark:

Which of the following is used in pencils ?

• Graphite
• Silicon
• Charcoal
• Phosphorous
Correct Option: A  [ Graphite ]

Remark:

The time period of a pendulum when taken to the Moon would:

• remain the same
• decrease
• become zero
• increase
Correct Option: D  [ increase ]

Remark: