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Science (Mixed)

Description: All about class X 2nd term science
Number of Questions: 15
Created by:
Tags: Classification of elements Reproduction Human Eye Evolution by stages and Human evolution Sexual Reproduction Carbon and its Compounds Alkanes Asexual Reproduction, Fission, Budding, Spore Formation, Regeneration Periodic Trends convex Lens Rules for the Inheritance of Traits, Expression of Traits
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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. 1 - double, 2 - four

  2. 1 - single, 2 - two

  3. 1 - single, 2 - four

  4. 1 - triple, 2 - two

  5. 1 - double, 2 - two

Show answer
Correct Option: C
Explanation:

Yes, it is correct as carbon has covalency of 4 and in alkane the nature of bond is single covalent.

When does an embryo become a fetus?

  1. After an egg is fertilized by a sperm cell during conception

  2. After fertilization when zygote attaches to the lining of the uterus wall

  3. After 15 days

  4. After delivery, embryo is called a fetus

  5. After 8 weeks of pregnancy

Show answer
Correct Option: E
Explanation:

Yes, it is correct, the embryo now resembles an adult and is known as fetus.

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

  1. c - b - a

  2. a - b - c

  3. a - c - b

  4. b - c - a

  5. b - a - c

Show answer
Correct Option: B
Explanation:

Yes, it is correct. C1 - C4 are colorless, odourless gases, C5 - C15 are colourless, odourless liquids and C18 onwards are waxy solids.

Atomic number of a light element = _____________ = ______________.

  1. atomic mass and number of electrons

  2. number of electrons and number of protons

  3. protons and neutrons

  4. atomic mass and number of neutrons

  5. number of electrons and number of neutrons

Show answer
Correct Option: B
Explanation:

Yes, atomic number of a light element is equal to the number of electrons and also number of protons.

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?

  1. Both (A) and (E) are true and (E) is the correct explanation.

  2. (A) is true but (E) is false.

  3. (A) is false but (E) is true.

  4. Both (A) and (E) are false.

  5. Both (A) and (E) are true but (E) is not the correct explanation.

Show answer
Correct Option: E
Explanation:

Yes, both are true but (E) is not the correct explanation. Hydra reproduces by regeneration process too but above statement states what is budding.

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. 1 - a, 2 - b, 3 - c

  2. 1 - c, 2 - b, 3 - a

  3. 1 - b, 2 - a, 3 - c

  4. 1 - b, 2 - c, 3 - a

  5. 1 - a, 2 - c, 3 - b

Show answer
Correct Option: A
Explanation:

Yes, it is correct. Prefix is the Number of carbon atoms. Root word is the nature of bond i.e. double or single bond and suffix is the functional group attached.

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

  1. Only 1

  2. Only 2

  3. Only 3

  4. Both 1 and 2

  5. Both 1 and 3

Show answer
Correct Option: E
Explanation:

Yes, both are correct. Both the features of birds show that they have evolved from reptiles

A lens is a made up of how many imaginary spheres?

  1. One

  2. Two

  3. Four

  4. Infinite

  5. None

Show answer
Correct Option: B
Explanation:

Yes, it is made up of two imaginary spheres. One curved surface extends towards left and forms a sphere and the other towards right. Hence, has two centre of curvatures.

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?

  1. Blue coloured eyes

  2. Curly hair

  3. Both 1 and 2

  4. Good at painting

  5. Both 2 and 4

Show answer
Correct Option: D
Explanation:

Yes, it is correct as this trait is her own acquired one. She practiced and made herself good in painting.

Alkanes when react with insufficient amount of oxygen, gives ____________.

  1. carbon dioxide

  2. carbon

  3. carbon monoxide

  4. lower alkane

  5. do not react

Show answer
Correct Option: C
Explanation:

Yes, it is correct. Carbon mono oxide is given with insufficient amount of oxygen.

Which of the following organisms shows the asexual reproduction type fragmentation?

  1. Potato

  2. Planaria

  3. Spirogyra

  4. Hydra

  5. Paramecium

Show answer
Correct Option: C
Explanation:

Yes, it is the correct answer. Spirogyra has filamentous body. It breaks into two or more fragments and each part grows into an individual.

According to Lindeman's law, the transfer of energy from one trophic level to the next is ___________.

  1. 0%

  2. 1%

  3. 100%

  4. 10%

  5. Dependent upon the condition

Show answer
Correct Option: D
Explanation:

Yes, no, it is ten percent, according to Linderman's law for the transfer of energy from one trophic level to the next.

Which of the following vegetables is/are artificially cultivated from wild cabbage?

  1. Kholrabi

  2. Cauliflower

  3. Kale

  4. Broccoli

  5. All of these

Show answer
Correct Option: E
Explanation:

Yes, all are correct.

Which of the following best explains cracking in hydrocarbons?

  1. The decomposition of compound in the presence of air.

  2. The decomposition of compounds by heating in presence of air.

  3. The decomposition of alkanes by heating in absence of air.

  4. The decomposition of alkenes by heating in absence of air.

  5. The decomposition of compounds by heating in absence of air.

Show answer
Correct Option: C
Explanation:

Yes, it is correct. The decomposition of compounds by heating in absence of air is called pyrolysis. Pyrolysis for alkanes is called cracking.

The elements belong to the same period is decided by the number of ___________.

  1. electrons in the outer shell

  2. protons

  3. shells

  4. total electrons

  5. electrons that it can donate

Show answer
Correct Option: C
Explanation:

Yes, the number of shells present in an atom decides the period to which it belongs.

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