Science Outside Delhi Set 3 2022-2023 English Medium Class 10 Question Paper Solution

Metal oxides generally react with acids, but few oxides of metal also react with bases. Such metallic oxides are:

1. MgO
2. ZnO
3. Al₂O₃ 
4. Cao

I and II

II and III

III and IV

I and IV

Few drops of aqueous solution of ammonium chloride are put on a universal indicator paper. The paper turns pink.

Choose the correct option.

Select the appropriate state symbols of the products given as X and Y in the following chemical equation by choosing the correct option from table given below: 

\[\ce{Zn_{(s)} + H_2SO_{4(l)} ->ZnSO_{4(X)} + H_{2(Y)}}\]

(X) - (s); (Y) - (l)

(X) - (aq); (Y) - (g)

(X) - (aq); (Y) - (s)

(X) - (g); (Y) - (aq)

There are four solutions A, B, C and D with pH values as follow:

Which solution(s) would liberate hydrogen gas with zinc?

A only

D only

A and D

B and C

In the given diagram of a closed stomata: (1), (2), (3) and (4) respectively are:

nucleus, chloroplast, guard cell, vacuole

nucleus, chloroplast, vacuole, guard cell

chloroplast, nucleus, vacuole, guard cell

vacuole, guard cell, nucleus, chloroplast

Walking in a straight line and riding a bicycle are the activities which are possible due to a part of the brain. Choose the correct location and name of this part from the given option :

In torches, search lights and headlights of vehicles the bulb is placed ______.

between the pole and the focus of the reflector

very near to the focus of the reflector

between the focus and centre of curvature of the reflector

at the centre of curvature of the reflector

Bronze is an alloy of ______.

copper and tin

copper and zinc

tin and zinc

copper, zinc and tin  

In peas, a pure tall plant (TT) is crossed with a pure short plant (tt). The ratio of pure tall plants to pure short plants in F₂ generation will be ______.

1 : 3

3 : 1

1 : 1

2 : 1

Choose the option giving correct matching the items given in column-I & II.

A - (iii), B - (i), C - (iv), D - (ii)

A - (iii), B - (iv), C - (i), D - (ii)

A - (iii), B - (iv), C - (ii), D - (i)

A - (iii), B - (i), C - (ii), D - (iv)

The thread like structures that develop on a moist slice of bread in Rhizopus are ______.

Rhizoids

Stems

Roots

Hyphae

The change in the focal length of an eye lens in human beings is caused by the action of ______.

optic nerves

ciliary muscles

retina

cornea

In the following diagram showing dispersion of white light by a glass prism, the colours 'P' and 'Q’ respectively are:  

Red and Violet

Violet and Red

Red and Blue

Orange and Green

Consider the following three flowers namely X, Y and Z. Which flower(s) would develop into a fruit?

Flower X	Flower Y	Flower Z

'X' only

'Z' only

'X' and 'Y' only

'Y' and 'Z'

is zero

decreases as we move towards its end.

increases as we move towards its end.

is same at all points.

In human eye the part which allows light to enter into the eye is ______.

Retina

Pupil

Eye lens

Cornea

Assertion (A): It is advised that while diluting an acid one should add water to acid and not acid to water keeping the solution continuously stirred.

Reason (R): The process of dissolving an acid into water is highly exothermic.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of (A).

Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of (A).

Assertion (A) is true, but Reason (R) is false.

Assertion (A) is false, but Reason (R) is true.

Assertion (A): The energy which passes to the herbivores does not come back to autotrophs.

Reason (R): The flow of energy in a food chain is unidirectional.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of (A).

Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of (A).

Assertion (A) is true, but Reason (R) is false.

Assertion (A) is false, but Reason (R) is true.

Assertion (A): Testes in human males are located outside the abdominal cavity in scrotum.

Reason (R): Scrotum provides a lower temperature than the normal body temperature for sperm formation.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of (A)

Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of (A)

Assertion (A) is true, but Reason (R) is false.

Assertion (A) is false, but Reason (R) is true

Assertion (A): Melting point and boiling point of ethanol are lower than that of sodium chloride.

Reason (R): The forces of attraction between the molecules of ionic compounds are very strong. 

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of (A).

Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of (A).

Assertion (A) is true, but Reason (R) is false.

Assertion (A) is false, but Reason (R) is true.

State whether the given chemical reaction is a redox reaction or not. Justify your answer.

\[\ce{MnO_2 + 4HCl->MnCl_2 +2H_2O + Cl_2}\]

How is an electric impulse created in human nervous system? 

Identify the parts of a neuron which help the nerve impulse to travel towards the cell body.

Identify the parts of a neuron which help the nerve impulse to travel away from the cell body.

With the help of an example, explain how does the feedback mechanism regulate the hormone secretion.

Give the name of the enzyme present in the fluid in our mouth cavity. State the gland which produces it. What would happen to the digestion process if this gland stops secreting this enzyme?

Let the resistance of an electrical device remain constant, while the potential difference across its two ends decreases to one fourth of its initial value. What change will occur in the current through it? State the law which helps us in solving the above stated question. 

A light ray enters from medium A to medium B as shown in the figure.

Which one of the two media is denser w.r.t. other medium? Justify your answer.

A light ray enters from medium A to medium B as shown in the figure.

If the speed of light in medium A is `v_a` and in medium B is `v_b`, what is the refractive index of B with respect to A.

A ray of light starting from diamond is incident on the interface separating diamond and water. Draw a labelled ray diagram to show. the refraction of light in this case.

Absolute refractive indices of diamond and water are 2.42 and 1.33 respectively. Find the value of refractive index of water w.r.t. diamond.

Draw magnetic field lines produced around a straight current carrying conductor passing through a cardboard. How will the strength of the magnetic field change when the point where magnetic field is to be determined is moved away from the conductor?

Explain the process of transport of oxygenated and deoxygenated blood in a human body.

What property do acids and bases have in common? Explain it with an example.

A compound which is prepared from gypsum has the property of hardening when mixed with water. identify the compound and write its formula. How is this compound prepared? Describe it in the form of a chemical equation only.

Write the chemical name and Molecular formula of tooth enamel.

How does tooth enamel get corroded? What is the preventive measure for this?

Name the gland and the hormone secreted by it in scary situations in human beings. List any two responses shown by our body when this hormone is secreted into the blood.

In the given diagram:

1. Name the parts labelled A, B, and C.
2. Write the functions of A and C.
3. Reflex arcs have evolved in animals? Why?

With the help of an appropriate example, justify that some of the chemical reactions are determined by Change in temperature.

Give chemical equation for the reaction involved in the above case.

With the help of an appropriate example, justify that some of the chemical reactions are determined by Evolution of a gas.

Give chemical equation for the reaction involved in the above case.

With the help of an appropriate example, justify that some of the chemical reactions are determined by Change in colour 

Give chemical equation for the reaction involved in the above case. 

A person is unable to see clearly a poster fixed on a distant wall. He however sees it clearly when standing at a distance of about 2 m from the wall.

1. Draw ray diagram to show the formation of image by his eye lens when he is far away from the wall.
2. List two possible reasons of this defect of vision.
3. Draw ray diagram to show the correction of this defect using appropriate lens.

What is a solenoid?

When does a solenoid behave as a magnet? Draw the pattern of the magnetic field produced inside it showing the directions of the magnetic field lines.

State the change in colour observed in following case mentioning the reason:

Silver chloride is exposed to sunlight.

State the change in colour observed in following case mentioning the reason:

A piece of zinc is dipped in ferrous sulphate solution.

State the change in colour observed in following case mentioning the reason:

Copper powder is strongly heated in air.

1. A compound 'A' with a molecular formula of \[\ce{C2H4O2}\] reacts with a base to give salt and water. Identify 'A', state its nature and the name of the functional group it possesses. Write chemical equation for the reaction involved.
2.  When the above stated compound 'A' reacts with another compound 'B' having molecular formula \[\ce{C2H6O}\] in the presence of an acid, a sweet smelling compound is 'C' formed.
   
   1. Identify 'B' and 'C'.
   2. State the role of acid in this reaction.
   3. Write chemical equation for the reaction involved.

Name the compound formed when ethanol is heated at 443 K in the presence of conc. \[\ce{H2SO4}\] and draw its electron dot structure.

State the role of conc. \[\ce{H2SO4}\] in the reaction.

What is hydrogenation?

Explain hydrogenation with the help of a chemical equation. State the role of this reaction in industry.

Name and differentiate between the two modes of pollination in flowering plants.

Explain the post fertilization changes that occur in the ovary of a flower.

Given below is a diagram of a germinating seed. Label the parts that:

1. gives rise to future shoot.
2. gives rise to future root system.
3. stores food. 

What is meant by resistance of a conductor ? Define its SI unit.

On what factors does the resistance of a conductor depend?

How will the resistance of a wire be affected if its

1. length is doubled, and
2. radius is also doubled ?

Give justification for your answer.

Three incandescent bulbs of 100 W each are connected in series in an electric circuit. In another circuit another set of three bulbs of the same wattage are connected in parallel to the same source.

1. Will the bulb in the two circuits glow with the same brightness? Justify your answer.
2. Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason.

On the basis of reactivity metals are grouped into three categories: 

1. Metals of low reactivity
2. Metals of medium reactivity
3. Metals of high reactivity

Therefore metals are extracted in pure form from their ores on the basis of their chemical properties.

Metals of high reactivity are extracted from their ores by electrolysis of the molten ore.

Metals of low reactivity are extracted from their sulphide ores, which are converted into their oxides. The oxides of these metals are reduced to metals by simple heating.

(a) Name the process of reduction used for a metal that gives vigorous reaction with air and water both.

(b) Carbon cannot be used as a reducing agent to obtain aluminium from its oxide? Why?

(c) Describe briefly the method to obtain mercury from cinnabar. Write the chemical equation for the reactions involved in the process.

                                     OR

(c) Differentiate between roasting and calcination giving chemical equation for each. 

All human chromosomes ate not paired. Most human chromosomes have a maternal and a paternal copy, and we have 22 such pairs. But one pair called the sex chromosomes, is odd in not always being a perfect pair. Women have a perfect pair of sex chromosomes. But men have a mismatched pair in which one is normal sized while the other is a short one.

(a) In humans, how many chromosomes are present in a Zygote and in each gamete?

(b) A few reptiles rely entirely on environmental cues for sex determination. Comment.

(c) "The sex of a child is a matter of chance and none of the parents are considered to be responsible for it." Justify it through flow chart only.

OR

(c) Why do all the gametes formed in human females have an X chromosome?

A student took three concave mirrors of different focal lengths and performed the experiment to see the image formation by placing an object at different distance with these mirrors as shown in the following table. 

Now answer the following questions:

(a) List two properties of the image formed in Case I.

(b) In which one of the cases given in the table, the mirror will form real image of same size and why?

(c) Name the type of mirror used by dentists. Given reason why do they use such type of mirrors.

OR

(c) Look at the table and identify the situation (object distance and focal length) which resembles the situation in which concave mirrors are used as shaving mirrors? Draw a ray diagram to show the image formation in this case.