| 1 |
biology bis classified as ___________ science. |
- A. Engineering
- B. Physical
- C. Natural
- D. Chemical
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| 2 |
There are _________ elements found till now . |
- A. 120
- B. 118
- C. 119
- D. 117
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| 3 |
The third abundant as found in the earth' crust is:<br> |
- A. Carbon monoxide <br>
- B. Oxygen <br>
- C. Nitrogen<br>
- D. Argon<br>
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| 4 |
The most abundant element occurring in the oceans is:<br> |
- A. Oxygen <br>
- B. Hydrogen <br>
- C. Nitrogen <br>
- D. Silicon <br>
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| 5 |
H2O is what type of molecules it is: |
- A. Manoatomic
- B. Polyatomic
- C. Pentaatomic
- D. Nil
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| 6 |
All of the following are tri-atomic molecules except:<br> |
- A. H<sup>2</sup>
- B. O<sup>3</sup>
- C. H<sup>2</sup>O
- D. CO<sup>2</sup>
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| 7 |
The No. of atoms in 1 mole of carbiton is |
- A. 6.02 x 1021
- B. 6.02 x 1022
- C. 6.02 x 1023
- D. 6.02 x 1024
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| 8 |
Which one an example of heterogeneous mixture? |
- A. Ice cream
- B. Concrete
- C. Both a & b
- D. NiL
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| 9 |
Electrons carry _________ charge. |
- A. +
- B. _
- C. Neutral
- D. Bouble Positive
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| 10 |
A _________ is a pure substance is made up of two or more elements. |
- A. Mixture
- B. Elements
- C. Solution
- D. Compound
|