Explore topic-wise InterviewSolutions in Current Affairs.

Answer is (C) Valmiki

(b) Napoleonic Invasion

Correct Answer is: (a) Verwoerd

(b) Spaniards

(d) (i) and (iv) are correct

(b) (i), (ii) and (iii) are correct

‘Dollar Imperialism’ is the term used to describe the policy of the USA in maintaining and dominating over distant lands through economic aid.

When the world economic depression affected South Africa very badly, Smuts believed that coalition Government was necessary to solve the economic problems of the country. Therefore, the South Africa party and the United party made an alliance in 1934. The alliance continued till 1939,

(a) Decolonisation is a process through which colonial powers transferred institutional and legal control over their colonies to indigenous nationalist government.

(b) Cambodia, Laos and Vietnam.

(c) Communist ideas from mainland China helped in developing the spirit of anti-colonalism in Indo-china. Many became convinced that the considerable wealth of Ind-ochina was benefiting only the colonial power. This aroused the feeling of nationalism which resulted in violence. In 1916 there was a major anti-colonial revolt which was crushed brutally. There were also guerrilla activities in Tongking.

(d) The mainstream political party in Indo-china was the Vietnam Nationalist Party. It was composed of the wealthy and middle-class sections of the population.

(a) Ho Chi Minh was bom in Tongking in 1890.

(b) In the Paris peace conference, he insisted the right for Vietnam independence. His articles on newspapers the Pamphlet, “French colonialism on Trial’’ , made him popular as a Vietnam nationalist.

(c) In 1923, he went to Moscow and learnt revolutionary techniques. In 1925, he founded the Revolutionary Youth Movement.

(d) League for Independence was called as Viet Minh in Indo-China.

(b) (i), (ii), (iii), (iv) are correct

The Great Depression had a deep impact on Indian agriculture. The value of farm produce, declined by half, while the land rent to be paid by the peasant, remained unchanged. In terms of prices of agricultural commodities, the obligation of the farmers to the state doubled.

(c) Share market

(a) Mas-Tse-Tung

Electronic configuration of Hydrogen resembles that of alkali metals. Like alkali metals, hydrogen combines with halogens, oxygen and sulphur to form compounds having similar formulae. On the other hand, just like halogens, hydrogen also exists as diatomic molecules and it combines with metals and non-metals to form covalent compounds. So, no fixed position can be given to hydrogen in the Periodic Table

(a) Both A and R are correct.

(b) A is correct but R is not the correct explanation.

The Berlin colonial conference of 1884-85 put forward the idea that Africa should be divided into spheres of influence of various colonial powers.

(c) Depression

In general, the various periods of violent repression led by the counter-revolutionary forces in any country is called as White terror. In Indo-China, when a large number of peasants revolted against the French government, . headed by the communists. It was crushed by the White terror. Many rebels were killed in this incident.

(i) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s²

Refer to CBSE Atoms and Nuclei Class 12 Mock Test. Students of class 12 complete lists of free Class 12 Online Mock Test of Atoms and Nuclei provided by Sarthaks eConnect. These Online mock test for Atoms and Nuclei Class 12 has been prepared based on the exam pattern of questions expected to return within the upcoming Class 12 exams and latest syllabus issued by CBSE. We've provided Mock test for class 12 Atoms and Nuclei with answers for all topics. the whole charge and most of the mass of the atom is concentrated during a small space referred to as the nucleus. The nucleus consists of protons and neutrons and together there are referred to as the nucleons.

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Ratio of nth orbit = \(k\frac{n^2}{z}\) where k= constant and n = no of orbit

Here z =1 (for hydrogen atom)

Now,

n for 3rd orbit = n² = 9

n for 2nd orbit = n² = 4

K is constant and Z =1

\(\frac{r_2}{r_3}\) \(=\frac{4}{9}\)

Given: A ± ∆A = 15.7 ± 0.2kg and 

B ± ∆B = 27.3 ± 0.3 kg. 

To find: Total mass (Z), and total error (∆Z) 

Formulae: i. Z = A + B

ii) ±∆Z = ±∆A ± ∆B

Calculation: From formula (i),

Z = 15.7 + 27.3 = 43 kg 

From formula (ii),

± ∆Z (± 0.2) + (± 0.3) 

=±(0.2 + 0.3) 

= ± 0.5 kg

Total mass is 43 kg and total error is ± 0.5 kg.

Ice is packed in sawdust because it prevents ice from melting. Sawdust is a bad conductor of heat.

1mole = 6.022 x 10²³ atoms/ ions / entities

When the wire is loaded beyond the elastic limit, then strain increases much more rapidly. The maximum stress corresponding to B (see stress-strain curve) after which the wire begin to flow and breaks, is called breaking stress or tensile strength and the force by application of which the wire breaks is called the breaking force. 

(i) Breaking force depends upon the area of cross-section of the wire. 

(ii) Breaking stress is a constant for a given material. 

(iii) Breaking force is independent of the length of wire. 

(iv) Breaking force α πr². 

(v) Length of wire if it breaks by its own weight

L = P/dg

(1) Temperature : The surface tension of liquid decreases with rise of temperature 

T_t = T₀ (1 – α t) 

where T_t , T₀ are the surface tensions at t°C and 0°C respectively and α is the temperature coefficient of surface tension. 

(2) Impurities : A highly soluble substance like sodium chloride when dissolved in water, increases the surface tension of water. But the springly soluble substances like phenol when dissolved in water, decreases the surface tension of water.

Semisynthetic polymer : Viscose rayon, cuprammonium silk.

When a gas is heated, the root mean square velocity of its molecules increases. As V_rms α√T so temperature of the gas increases.

Correct answer is

C. an animal

Correct answer is

D. Terylene

Correct answer is

(d) Keratin

Correct answer is

C. Nylon

Correct answer is

(d) Keratin

Correct answer is

(c) Nylon

If a position dependent force is always directed towards or away from a fixed point it is said to be central otherwise non-central.

1. The motion of a body along the circumference of a circle with constant speed is called uniform circular motion.

2. The magnitude of velocity remains constant and its direction is tangential to its circular path.

3. The acceleration is of constant magnitude and it is perpendicular to the tangential velocity. It is always directed towards the centre of the circular path.

This acceleration is called centripetal acceleration.

4. The centripetal force provides the necessary centripetal acceleration.

5. Examples of U.C.M:

• Motion of the earth around the sun.
• Motion of the moon around the earth.
• Revolution of electron around the nucleus of atom.

If under the action of a force the work done in a round trip is zero or the work is path independent, the force is said to be conservative otherwise non-conservative. 

Example : 

Conservative force : Gravitational force, electric force, elastic force. 

Non-conservative force : Frictional force, viscous force.

Correct answer is

(a) cotton

Correct answer is

(b) cotton

Correct answer is

(c) terylene

(a) (i) Atomic radius decreases from left to right in a period because effective nuclear charge increases from left to right in a period. Due to this effective nuclear charge, the electronegativity increases and the attraction of nucleus on valence shell electrons also increases. So the size decreases. 

(ii) Atomic radius increases down a group because number of shells increases. 

(b) X₁₂- 2, 8, 2 

Y₁₆- 2, 8, 6 

These two elements belong to 3 period because period of an atom in periodic table is equal to the number of shells present in that atom. 

These two elements will form ionic bond because X has two valence electrons so it will completely lose these two electrons to acquire noble gas electronic configuration and Y has six valence electrons and it has more electronegativity so it will gain two electrons to complete its octet. So X will completely give its two electrons to Y and ionic bond will form.

(a) (i) G with atomic number 10 is a noble gas because it has complete octet. 

(ii) F with atomic number 17 is a halogen. 

(b) B with atomic number 11 has 1 valence electron and F with atomic number 17 has 7 valence electrons so the formula of the compound formed would be BF. 

(c) Electronic configuration of C and E are 

E₈- 2, 6 

C₁₂- 2, 8, 2

(i) Electronic configuration of F is 

F₁₂- 2, 8, 2 

(ii) There are 2 valence electrons in the atom of F. 

Explanation- Valence electrons are those electrons which present in the last shell. 

(iii) There are 3 shells in the atom of F. 

(iv) We know that atomic size increases from top to bottom in a group due to increment in shells. So the order will be H>G>F>E. 

(v) Since F has 2 valence electrons so it will donate these two electrons to acquire noble gas electronic configuration. Hence it is a metal. 

(vi) We know that atomic size increases from top to bottom in a group and decreases from left to right in a period. So B has the bigger atomic size.

Photoelectric effect thus gave evidence to the strange fact that light in interaction with matter behaved as if it was made of quanta or packets of energy, each of energy hν.

(i) In interaction of radiation with matter, radiation behaves as if it is made up of particles called photons. 

(ii) Each photon has energy E (=hn) and momentum p (= h ν/c), and speed c, the speed of light. 

(iii) All photons of light of a particular frequency ν, or wavelength l, have the same energy E (=hν = hc/λ) and momentum p (= h ν/c = h/λ), whatever the intensity of radiation may be. By increasing the intensity of light of given wavelength, there is only an increase in the number of photons per second crossing a given area, with each photon having the same energy. Thus, photon energy is independent of intensity of radiation. 

(iv) Photons are electrically neutral and are not deflected by electric and magnetic fields. 

(v) In a photon-particle collision (such as photon-electron collision), the total energy and total momentum are conserved. However, the number of photons may not be conserved in a collision. The photon may be absorbed or a new photon may be created. 

(A) lltutmish

To begin with, an ornamented gateway led to an entrance and the main hall (mahamandapa) where dances were performed. The image of the chief deity was kept in the main shrine (garbha griha). This was the place for ritual worship where only the king, his immediate family, and priests gathered.

a. Temples and mosques were built beautifully because they were places of worship.

b. Temples and mosques were meant to demonstrate the power, wealth and devotion of the patron.

c. The King Rajarajadeva built Rajarajeshvara temple.

d. King Rajarajadeva took the name of God – Rajarajesvara because it was auspicious and he wanted to appear like a god.

e. The Lord Rajarajeshvara and the King Rajarajadeva who himself wanted to appear like a god.

(A) Mahmud Ghazni