Science Delhi Set 2 2021-2022 English Medium Class 10 Question Paper Solution

"Carbon prefers to share its valence electrons with other atoms of carbon or with atoms of other elements rather than gaining or losing the valence electrons in order to attain noble gas configuration." Give reasons to justify this statement.

The atomic number of an element 'X' is 11.

1. Write the electronic configuration of X and find its valency.
2. Write the formula and nature of its oxide.

Give reason.

Placenta is extremely essential for foetal development.

Give reason:

Uterine lining becomes thick and spongy after fertilisation.

Name the reproductive and non-reproductive parts of bread mould (Rhizopus).

List two advantages of vegetative propagation.

In the following figure showing a germinating gram seed, name the parts labelled as A, B and C:

Why is Part 'B' considered to be important during germination?

A part of modern periodic table is given below. On its basis, answer the following questions:

Write the molecular formula of the compound formed by the combination:

A and F

A part of modern periodic table is given below. On its basis, answer the following questions:

Write the molecular formula of the compound formed by the combination:

E and B

A part of modern periodic table is given below. On its basis, answer the following questions:

Which of the element is a Noble gas?

A part of modern periodic table is given below. On its basis, answer the following questions:

Which of the element is a Metalloid?

Write the chemical formula of two consecutive homologous of organic compounds having functional group - OH. 

What happens to the (i) boiling point and (ii) solubility of organic compounds of a homologous series as the molecular mass increases?

State Newland’s Law of Octaves.

With an example, explain Dobereiner's Triads.

List two limitations of Newlands' Law of Octaves.

What were the limitations of Dobereiner’s classification?

Consider the following organic compounds:

1. Name the functional group present in these compounds.
2. Write the general formula for the compounds of this functional group.
3. State the relationship between these compounds and draw the structure of any other compound having a similar functional group.

Draw the electron dot structure for ethyne.

List two differences between the properties exhibited by covalent compounds and ionic compounds.

In the given circuit determine the value of:

1. Total resistance of the circuit
2. Current flowing through the ammeter.

A green stemmed tomato plant denoted by (GG) is crossed with a tomato plant with purple stem denoted by (gg).

1. What colour of the stem would you expect in their F₁ progeny?
2. In what ratio would you find the green and purple coloured stem in plants of F₂ progeny?
3. What conclusion can be drawn for the above observations?

On what factors does the resistance of a conductor depend?

The resistance of a wire of 0.01 cm radius is 10 Ω. If the resistivity of the wire is 50 × 10^-8 Ω, find the length of this wire.

What is the meaning of electric power of an electrical device? Write its SI unit.

An electric kettle of 2 kW is used for 2h. Calculate the energy consumed in 

1. kilowatt hour and
2. joules.

Why is ozone layer getting depleted at the higher levels of the atmosphere? Mention one harmful effect caused by its depletion.

Mendel blended his knowledge of science and mathematics to keep count of the individuals exhibiting a particular trait in each generation. He observed a number of contrasting visible characters controlled in pea plants in a field. He conducted many experiments to arrive at the laws of inheritance.

1. What do the F₁ progeny of tall plants with round seeds and short plants with wrinkled seeds look like?
2. Name the recessive traits in the above case.
3. Mention the type of the new combinations of plants obtained in F₂ progeny along with their ratio, if F₁ progeny was allowed to self-pollinate.

OR

If 1600 plants were obtained in F₂ progeny, write the number of plants having traits:

1. Tall with round seeds.
2. Short with wrinkled seeds.

Write the conclusion of the above experiment. 

A student was asked to perform an experiment to study the force on a current carrying conductor in a magnetic field. He took a small aluminium rod AB, a strong horse shoe magnet, some connecting wires, a battery and a switch and connected them as shown. He observed that on passing current, the rod gets displaced. On reversing the direction of current, the direction of displacement also gets reversed. On the basis of your understanding of this phenomenon, answer the following questions: 

1. Why does the rod get displaced on passing current through it?
2. State the rule that determines the direction of the force on the conductor AB.
3. 1. If the U-shaped magnet is held vertically and the aluminium rod is suspended horizontally with its end B towards due north, then on passing current through the rod from B to A as shown, in which direction will the rod be displaced?
   2. Name any two devices that use current carrying conductors and magnetic fields.

OR

Draw the pattern of magnetic field lines produced around a current carrying straight conductor held vertically on a horizontal cardboard. Indicate the direction of the field lines as well as the direction of current flowing through the conductor.