In plants, extra-chromosomal DNA is found in

• Nucleus
• Chloroplast
• Ribosome
• Golgi bodies
Correct Option: B  [ Chloroplast ]

Remark: In many cases, extrachromosomal DNA is contained in cytoplasmic organelles, such as mitochondria (animals), and in chloroplasts and plastids (plants).

Which among the following is present in refrigerator?

• Carbon dioxide
• Methane
• Helium
• Chlorotluorocarbon
Correct Option: D  [ Chlorotluorocarbon ]

Remark: Chlorotluorocarbons (CFCs) have recently been phased out and newer refrigerators will not contain CFCs. The use of CFCs was phased out by 2000 under the Montreal Protocol.

Monitor of a computer is:

• Input device
• Output device
• Input/Output device
• None of these
Correct Option: B  [ Output device ]

Remark:

The brain of any computer system is:

• ALU
• Memory
• Memory
• CPU
Correct Option: D  [ CPU ]

Remark:

Which of the following compounds is used in fire extinguishers ?

• Sodium carbonate
• Sodium bicarbonate
• Sodium nitrate
• Sodium sulphate
Correct Option: B  [ Sodium bicarbonate ]

Remark:

Plasma membrane in eukaryotic cells is made up of:

• Phospholipid
• Lipoprotein
• Phospholipo-protein
• Phospho-protein
Correct Option: A  [ Phospholipid ]

Remark:

Which one among the following is strong smelling agent used in LPG cylinder to help in the detection of gas leakage?

• Ethanol
• Thioethanolanine
• Methane
• Chloroform
Correct Option: B  [ Thioethanolanine ]

Remark:

Which amongst the following is the largest mammal?

• elephant
• whale
• dinosaur
• rhinoceros
Correct Option: B  [ whale ]

Remark:

Compound microscope has

• two lenses
• requires UV light source
• used to view only dead organisms
• requires large room space
Correct Option: A  [ two lenses ]

Remark:

Which of the following is not a property of acids ?

• All acids have sour taste
• All acids are corrosive in nature
• For acidic solutions pH = <7
• Acids tum red litmus to blue
Correct Option: D  [ Acids tum red litmus to blue ]

Remark: