Questions
In alkane hydrocarbons the carbons are attached to each other and hydrogen by 1 _______ bond, and each carbon atoms bonds to give maximum covalency of 2 _______.
- 1 - double, 2 - four
- 1 - single, 2 - two
- 1 - single, 2 - four
- 1 - triple, 2 - two
- 1 - double, 2 - two
When does an embryo become a fetus?
- After an egg is fertilized by a sperm cell during conception
- After fertilization when zygote attaches to the lining of the uterus wall
- After 15 days
- After delivery, embryo is called a fetus
- After 8 weeks of pregnancy
With increase in number of carbon atoms in alkanes write the correct order of the compounds, from odourless gas to odourless liquid to odourless solid.
(a) C1 - C4
(b) C5 - C15
(c) C18 onwards
- c - b - a
- a - b - c
- a - c - b
- b - c - a
- b - a - c
Atomic number of a light element = _____________ = ______________.
- atomic mass and number of electrons
- number of electrons and number of protons
- protons and neutrons
- atomic mass and number of neutrons
- number of electrons and number of neutrons
Assertion (A) - In budding the parent cell produces bud.
Explanation (E) - Hydra's body breaks up into several parts to develop into an individual.
Which of the following options is correct?
- Both (A) and (E) are true and (E) is the correct explanation.
- (A) is true but (E) is false.
- (A) is false but (E) is true.
- Both (A) and (E) are false.
- Both (A) and (E) are true but (E) is not the correct explanation.
Match the following according to which the nomenclature of organic compounds is done
| 1 | Prefix | a | Number of carbon atoms |
| 2 | Root word | b | Nature of bond |
| 3 | Suffix | c | Functional group |
- 1 - a, 2 - b, 3 - c
- 1 - c, 2 - b, 3 - a
- 1 - b, 2 - a, 3 - c
- 1 - b, 2 - c, 3 - a
- 1 - a, 2 - c, 3 - b
Which of the following features show(s) that birds have evolved from reptiles?
(a) Feathers
(b) Egg laying nature
(c) Common opening for faeces and urine
- Only 1
- Only 2
- Only 3
- Both 1 and 2
- Both 1 and 3
A lens is a made up of how many imaginary spheres?
- One
- Two
- Four
- Infinite
- None
Riya has blue coloured eyes and curly hairs. She is a damn good painter. Which of her traits is/are not inherited one but is an acquired trait?
- Blue coloured eyes
- Curly hair
- Both 1 and 2
- Good at painting
- Both 2 and 4
Alkanes when react with insufficient amount of oxygen, gives ____________.
- carbon dioxide
- carbon
- carbon monoxide
- lower alkane
- do not react
Which of the following organisms shows the asexual reproduction type fragmentation?
- Potato
- Planaria
- Spirogyra
- Hydra
- Paramecium
According to Lindeman's law, the transfer of energy from one trophic level to the next is ___________.
- 0%
- 1%
- 100%
- 10%
- Dependent upon the condition
Which of the following vegetables is/are artificially cultivated from wild cabbage?
- Kholrabi
- Cauliflower
- Kale
- Broccoli
- All of these
Which of the following best explains cracking in hydrocarbons?
- The decomposition of compound in the presence of air.
- The decomposition of compounds by heating in presence of air.
- The decomposition of alkanes by heating in absence of air.
- The decomposition of alkenes by heating in absence of air.
- The decomposition of compounds by heating in absence of air.
The elements belong to the same period is decided by the number of ___________.
- electrons in the outer shell
- protons
- shells
- total electrons
- electrons that it can donate