Science Delhi Set 3 2021-2022 English Medium Class 10 Question Paper Solution

1. Write the electronic configuration of element X, given by its symbol as under: \[\ce{^40_20 X}\]
2. Determine its position in the modem periodic table.
3. What is the nature of its oxide?
4. Name one other element of its group.

1. Write the name and draw the structure of a saturated hydrocarbon with four carbon atoms.
2. Write the number of single covalent bonds present in this compound.

Give reason.

Placenta is extremely essential for foetal development.

Give reason:

Uterine lining becomes thick and spongy after fertilisation.

State one drawback of the following: 

Oral contraceptive pills

State one drawback of the following:

Copper - T

Under which category of contraceptive methods, is the use of condom kept? In what way, its use is better as compared to other methods of contraception?

Name the reproductive parts of an angiosperm. Where are these parts located? Explain the structure of its male reproductive part.

What is puberty?

Mention any two changes that are common to both boys and girls in early teenage years.

Name the poles P, Q, Rand S of the magnets in the following figures 'a' and 'b':

Figure 'a'	Figure 'b'

State the inference drawn about the direction of the magnetic field lines on the basis of the following diagrams.

Figure 'a'	Figure 'b'

When is the force experienced by a current-carrying straight conductor placed in a uniform magnetic field.

1. Maximum
2. Minimum

In the following food chain, only 2J of energy was available to the peacocks. How much energy would have been present in Grass? Justify your answer.

GRASS → GRASS HOPPER → FROG → SNAKE → PEACOCK

What is meant by garbage?

List two classes into which garbage is classified.

What do we actually mean when we say that the "enzymes are specific in their action"?

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.

What is the heating effect of electric current?

Write an expression for the amount of heat produced in a resistor when an electric current is passed through it stating the meanings of the symbols used.

Write two devices based on the heating effect of electric current.

What are chromosomes?

Explain how stability of the DNA of the species is ensured in sexually reproducing organisms.

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.