Science Outside Delhi Set 1 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)

Two salts 'X' and 'Y' are dissolved in water separately. When phenolphthalein is added to these two solutions, the solution 'X' turns pink and the solution 'Y' does not show any change in colour, therefore 'X' and 'Y' are:

(X) - \[\ce{Na_2CO_3}\]; (Y) - \[\ce{NH_4Cl}\]

(X) - \[\ce{Na_2SO_4}\]; (Y) - \[\ce{NaHCO_3}\]

(X) - \[\ce{NH_4Cl}\] ; (Y) - \[\ce{Na_2SO_4}\]

(x) - \[\ce{NaNO_3}\] ; (Y) - \[\ce{Na_2SO_4}\]

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 :

A student wants to obtain an erect image of an object using a concave mirror of 10 cm focal length. What will be the distance of the object from mirror? 

Less than 10 cm

10 cm

between 10 cm and 20 cm

more than 20 cm

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

Study the given figure of a Food web and identify the primary consumer in the food web:

Mice and Bear

Rabbit and Cat

Rabbit and Fox

Mice and Rabbit

Choose the correct order of the stages of binary fission in Leishmania.

(I)	(II)	(III)	(IV)	(V)

I, II, III, IV, V

I, III, II, V, IV

I, III, V, II, IV

I, II, III, V, IV

Consider the following chemical equation I and II

1. \[\ce{Mg + 2HCl -> MgCl_2 +H_2}\]
2. \[\ce{NaOH +HCl -> NaCl + H_2O}\]

The correct statement about these equations is:

'I' is a displacement reaction and 'II' is a  decomposition reaction.

'I' is a displacement reaction and 'II' is double displacement reaction.

Both 'I' and 'II' are displacement reactions.

Both 'I' and 'II' are double- displacement reactions.

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): Amoeba takes in food using finger like extensions of the cell surface.

Reason (R): In all unicellular organisms, the food is taken in by the entire cell surface.

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.

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

List two differences between the movement of leaves of a sensitive plant and the movement of a shoot towards light.

What happens at the synapse between two neurons?

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.

State the rule to determine the direction of a magnetic field produced around a straight conductor-carrying current.

Name and state the rule of determine the direction of force experienced by a current carrying straight conductor placed in a uniform magnetic field which is perpendicular to it. 

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

A substance 'X' is used as a building material and is insoluble in water. When it reacts with dil. HCl, it produces a gas which turns lime water milky.

1. Write the chemical name and formula of 'X'.
2. Write chemical equations for the chemical reactions involved in the above statements.

A metal 'M' on reacting with dilute acid liberates a gas 'G'. The same metal also liberates gas 'G' when reacts with a base.

1. Write the name of gas 'G'.
2. How will you test the presence of this gas?
3. Write chemical equations for the reactions of the metal with (1) an acid and (2) a base.

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. 

State reasons for Myopia. With the help of ray diagrams, show the:

1. image formation by a myopic eye, and
2. correction of myopia using an 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.

Write the percentage of solar energy captured by the autotrophs.

Write the percentage of energy transferred from autotrophs to the next level in a food chain.

What are trophic level?

Why do different food chains in an ecosystem not have more than four to five trophic levels? Give reason.

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.

Give reason for the following:

During reproduction inheritance of different proteins will lead to altered body designs.

Give reason for the following:

Fertilization cannot take place in flowers if pollination does not occur.

Give reason for the following:

All multicellular organisms cannot give rise to new individuals through fragmentation or regeneration.

Give reason for the following:

Vegetative propagation is practised for growing only some type of plants.

Give reason for the following:

The parents and off-springs of organisms reproducing sexually have the same number of chromosomes.

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.