100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS Page 161 InterviewSolution

8001.

In the fourteenth century, which of the following travelers came to India?1. Ibn Battuta2. Duarte Barbosa3. Francois Bernier4. Antonio Monserrate

Answer» Correct Answer - Option 1 : Ibn Battuta

The correct answer is Ibn Battuta.

Ibn Battuta was born in Tangier, Morocco, on the 24th of February 1304 C.E.
Ibn Battuta has spent his 30 years traveling across the Middle East, India, Africa, and Southeast Asia.
Ibn Battuta in 1333 visited India and he met Sultan Muhammad Bin Tughlaq.
Mohammad bin Tughlaq appointed Battuta as a judge and expert on Islamic Law.
Ibn Battuta wrote a famous travel book Rihlah (Arabic).

Duarte Barbosa

Durate Barbosa was a famous writer and Portugues Officer in India.

Famous book:

The Book of Duarte Barbosa.

Francois Bernier

He was a French Physician and traveler.

Francois Bernier personal physician to Mughal prince Dara Shikoh.

Famous Books:

Travels in the Mogul Empire.

The history of the late revolution of the empire of the Great Mogul.

Antonio Monserrate

Antonio Monserrate is a Portuguese priest.

Monserrate soon was appointed tutor to Murad, the second son of the Akbar.

Monserrate’s account is an important primary source for the study of Akbar and his court and empire.

Discussion

8002.	Fill in the blanks by choosing the appropriate expression given in bracket.Navdanya, the movement .......... biodiversity conservation ........... organic farming .......... I started in 1987, is spreading ......... far we’ve worked with farmers. (that, for, so, and)
Answer» Navdanya, the movement or biodiversity conservation and organic farming that I started in 1987, is spreading so far we’ve worked with farmers.

Discussion

8003.

In the context of forest conservation, Navadanya Movement was founded in 1987 by ______.1. Pandurang Hegde2. Baba Amte3. Vandana Shiva4. Medha Patkar

Answer» Correct Answer - Option 3 : Vandana Shiva

The correct answer is Vandana Shiva.

Navdanya is an Indian-based non-governmental organization that promotes biodiversity conservation, biodiversity, organic farming, the rights of farmers, and the process of seed saving.
Vandana Shiva, an environmental activist, physicist, and author from Delhi, India.

"Navdanya" means "nine crops" that represent India's collective source of food security.
Navdanya’s mission focuses on improving the well being of small and marginalized rural producers through non-violent biodiverse organic farming and fair trade.
Navdanya’s mission is to promote peace and harmony, justice, and sustainability. We strive to achieve these goals through the conservation, renewal, and rejuvenation of the gifts of biodiversity we have received from nature and our ancestors, and to defend these gifts as commons.

Pandurang Hegde	He is an environmentalist from Uttara Kannada district, Karnataka, India. He started the Appiko movement to protect trees in the Western Ghats.
Baba Amte	He was a lawyer, social worker, and social activist from Hinganghat, Wardha Dist, Maharastra. He was particularly known for his work for the rehabilitation and empowerment of people suffering from leprosy.
Medha Patkar	She is a social activist from Mumbai, Maharastra. She is the founding member of Narmada Bachao Andolan. She is also working on various crucial political and economic issues raised by tribals, Dalits, farmers, labourers and women facing injustice in India.

Discussion

8004.	Observe the information provided in the table about quantum numbers. Then answer the questions given below it.nlml1002010–1, 0, +13012 0–1, 0, +1–2, –1, 0, +1, +2(i) Write the 'l' value and symbol of the spherical shaped sub-shell. (ii) How many values that ml takes for l = 2 ? What are they ? (iii) Write the symbols of the orbitals for l = 1 sub-shell ? (iv) What is the shape of the sub-shell for l = 2 ? What is the maximum number of electrons that can occupy this sub-shell ?
Answer» (i) Spherical shaped sub-shell 'l' value is zero and symbol is 's'. (ii) Number of m_lvalues for l = 2 is 5, those are –2, –1, 0,1,2 (iii) Symbols of the orbitals for l = 1 sub-shell are p_x, p_y, p_z . (iv) Shape of the sub-shell l = 2 is double dumbel. The maximum number of electrons that can occupy in this sub-shell is 10.

8004.

Observe the information provided in the table about quantum numbers. Then answer the questions given below it.nlml1002010–1, 0, +13012 0–1, 0, +1–2, –1, 0, +1, +2(i) Write the 'l' value and symbol of the spherical shaped sub-shell. (ii) How many values that ml takes for l = 2 ? What are they ? (iii) Write the symbols of the orbitals for l = 1 sub-shell ? (iv) What is the shape of the sub-shell for l = 2 ? What is the maximum number of electrons that can occupy this sub-shell ?

Answer»

(i) Spherical shaped sub-shell 'l' value is zero and symbol is 's'.

(ii) Number of m_lvalues for l = 2 is 5, those are –2, –1, 0,1,2

(iii) Symbols of the orbitals for l = 1 sub-shell are p_x, p_y, p_z .

(iv) Shape of the sub-shell l = 2 is double dumbel.

The maximum number of electrons that can occupy in this sub-shell is 10.

Discussion

8005.	Some elements belonging to second period of periodic table, and their atomic radii are given below.Observe them and write answers.2nd period elements BBeONLiCAtomic radii8811166 7415277(a) Write the elements in the ascending order of their atomic radii. (b) Which of the 2nd period elements closer to the configuration of inert gas ? (c) Which is the outermost orbit of all these elements ? (d) Which elements atomic size bigger Beryllium or Carbon ? Why ?
Answer» (a) The ascending order of atomic sizes is O, N, C, B, Be and Li. (b) Lithium has closest inert gas configuration i.e., 1s² 2s¹.Its nearest inert gas is Helium. (c) The outermost orbit for all these elements is second orbit. (d) Beryllium has more atomic size than Carbon. Because when we move across a period the atomic number increases. So nuclear attraction of outermost orbit increases. So carbon has lesser size than Beryllium.

8005.

Some elements belonging to second period of periodic table, and their atomic radii are given below.Observe them and write answers.2nd period elements BBeONLiCAtomic radii8811166 7415277(a) Write the elements in the ascending order of their atomic radii. (b) Which of the 2nd period elements closer to the configuration of inert gas ? (c) Which is the outermost orbit of all these elements ? (d) Which elements atomic size bigger Beryllium or Carbon ? Why ?

Answer»

(a) The ascending order of atomic sizes is O, N, C, B, Be and Li.

(b) Lithium has closest inert gas configuration i.e., 1s² 2s¹.Its nearest inert gas is Helium.

(c) The outermost orbit for all these elements is second orbit.

(d) Beryllium has more atomic size than Carbon. Because when we move across a period the atomic number increases. So nuclear attraction of outermost orbit increases. So carbon has lesser size than Beryllium.

Discussion

8006.	Observe the information provided in the table about quantum numbers. Then answer the questions given below it.nlml10020 01– 1, 0, + 13001– 1, 0, + 12– 2, – 1, 0, + 1, + 2(i) Write the 'l' value and symbol of the spherical shaped sub-shell. (ii) How many values that 'ml ' takes for l = 2 ? What are they? (iii) Write the symbols of the orbitals for l = 1 sub-shell. (iv) What is the shape of the sub-shell for l = 2? What is the maximum number of electrons that can occupy this sub-shell ?
Answer» (i) Spherical shaped sub-shell "l" value is zero and symbol is 's'. (ii) Number of ml values for l = 2 is 5, those are – 2, – 1, 0, 1, 2. (iii) Symbols of the orbitals for l = 1 sub-shell are p_x, p_y, p_z. (iv) Shape of the subshell l = 2 is double dumbel. The maximum number of electrons that can occupy in this sub-shell is 10.

8006.

Observe the information provided in the table about quantum numbers. Then answer the questions given below it.nlml10020 01– 1, 0, + 13001– 1, 0, + 12– 2, – 1, 0, + 1, + 2(i) Write the 'l' value and symbol of the spherical shaped sub-shell. (ii) How many values that 'ml ' takes for l = 2 ? What are they? (iii) Write the symbols of the orbitals for l = 1 sub-shell. (iv) What is the shape of the sub-shell for l = 2? What is the maximum number of electrons that can occupy this sub-shell ?

Answer»

(i) Spherical shaped sub-shell "l" value is zero and symbol is 's'.

(ii) Number of ml values for l = 2 is 5, those are – 2, – 1, 0, 1, 2.

(iii) Symbols of the orbitals for l = 1 sub-shell are p_x, p_y, p_z.

(iv) Shape of the subshell l = 2 is double dumbel.

The maximum number of electrons that can occupy in this sub-shell is 10.

Discussion

8007.	_________ was the summer capital of the British.1. Dalhousie2. Ooty3. Shimla4. Darjeeling
Answer» Correct Answer - Option 3 : Shimla The correct answer is Shimla. Sir John Lawrence officially declared Simla the summer capital of the British empire in 1864. After independence, the city became the capital of Punjab and was later made the capital of Himachal Pradesh. During the British Raj, until 1911, Calcutta was the capital of India. King George V proclaimed the transfer of the capital from Calcutta to Delhi at the climax of the 1911 Imperial Durbar on 12 December 1911. Now Shimla is the summer capital of Himachal Pradesh. Dharamshala is the winter capital of Himachal Pradesh. Dalhousie is a high-altitude town spread across 5 hills of Himachal Pradesh. Ooty (short for Udhagamandalam) is a resort town in the Western Ghats mountains, in Tamil Nadu state. Darjeeling is a town in India's West Bengal state, in the Himalayan foothills.

8007.

_________ was the summer capital of the British.1. Dalhousie2. Ooty3. Shimla4. Darjeeling

Answer» Correct Answer - Option 3 : Shimla

The correct answer is Shimla.

Sir John Lawrence officially declared Simla the summer capital of the British empire in 1864.
After independence, the city became the capital of Punjab and was later made the capital of Himachal Pradesh.
During the British Raj, until 1911, Calcutta was the capital of India.

King George V proclaimed the transfer of the capital from Calcutta to Delhi at the climax of the 1911 Imperial Durbar on 12 December 1911.
Now Shimla is the summer capital of Himachal Pradesh.
Dharamshala is the winter capital of Himachal Pradesh.
Dalhousie is a high-altitude town spread across 5 hills of Himachal Pradesh.
Ooty (short for Udhagamandalam) is a resort town in the Western Ghats mountains, in Tamil Nadu state.
Darjeeling is a town in India's West Bengal state, in the Himalayan foothills.

Discussion

8008.	Shimla was declared as the summer capital of British India in _____.1. 18622. 18633. 18644. 1865
Answer» Correct Answer - Option 3 : 1864 In 1864, Shimlawas declared theSummer Capital of British India. It was declared by Sir John Lawrence. The British used to move from Calcutta to Shimla between April to October every year. Later, Shimla was transferred to the capital of Punjab. And lastly, Himachal Pradesh got Shimla as a capital. Hence, we can conclude that Shimla became the Summer Capital of India.

8008.

Shimla was declared as the summer capital of British India in _____.1. 18622. 18633. 18644. 1865

Answer» Correct Answer - Option 3 : 1864
In 1864, Shimlawas declared theSummer Capital of British India.

It was declared by Sir John Lawrence.
The British used to move from Calcutta to Shimla between April to October every year.
Later, Shimla was transferred to the capital of Punjab.
And lastly, Himachal Pradesh got Shimla as a capital.

Hence, we can conclude that Shimla became the Summer Capital of India.

Discussion

8009.	Which of the following is malachile?A. `Cu_(2)S`B. `CuFeS_(2)`C. `Cu(CH)_(2) ,2CaCO_(3)`D. `Cu(OH)_(2) CaCO_(2)`
Answer» Correct Answer - d Malachite (green) is a basic copper carbonate its copposition is `CaCO_(2), CaOH)_(2)` Arurite (blue) is mother example of basic copper carbonate , its composition is `2CaCO_(2)Ca (OH)_(2)` Malachine and strite are used respectively as green and blue pigments copper is meainly extercted from copper pyoles `CaFeS_(2)` THe term fools gold is used for copper pyrites which like gold

Discussion

8010.	A sample of `C_(x)O_(y)` having `3xx10^(19)` molecules is weighing `3.4 mg`. Then the value of x and y is respectively …………… `(Take N_(A) = 6xx10^(23))`A. `1,2`B. `3,2`C. `2,2`D. `5,2`
Answer» Correct Answer - B A sample of `C_(x)O_(y)` having `3xx10^(18)` ………….. Mass of `N_(A)` molecules (Molar mass) `= (3.4xx10^(-3))/(3xx10^(19))xx6xx10^(23)` `= 68 g//mol` This is satisfied only for `x = 3 and y = 2` .

Discussion

8011.	A large body of magmatic material that cools in the deeper depth of the Earth's crust and develops in the form of large domes is known as1. Batholiths2. Lacoliths3. Lopoliths4. Phacoliths
Answer» Correct Answer - Option 1 : Batholiths The correct answer is Batholiths. The lava that is released during volcanic eruptions on cooling develops into igneous rocks. Depending on the location of the cooling of the lava, igneous rocks are classified as volcanic rocks (cooling at the surface) and plutonic rocks (cooling in the crust). The lava that cools within the crustal portions assumes different forms called intrusive forms. They are: Batholiths A large body of magmatic material that cools in the deeper depth of the crust develops in the form of large domes. They appear on the surface only after the denudational processes remove the overlying materials. They cover large areas, and at times, assume depth that may be several km. Batholiths are the cooled portion of magma chambers. Lacoliths These are large dome-shaped intrusive bodies with a level base and connected by a pipe-like conduit from below. It resembles the surface volcanic domes of composite volcano, only these are located at deeper depths. It can be regarded as the localised source of lava that finds its way to the surface. Lapoliths As and when the lava moves upwards, a portion of the same may tend to move in a horizontal direction wherever it finds a weak plane. In case it develops into a saucer shape, concave to the sky body, it is called lapolith. Phacoliths A wavy mass of intrusive rocks, at times, is found at the base of synclines or at the top of anticline in folded igneous country. Such wavy materials have a definite conduit to source beneath in the form of magma chambers. These are called the phacoliths.

8011.

A large body of magmatic material that cools in the deeper depth of the Earth's crust and develops in the form of large domes is known as1. Batholiths2. Lacoliths3. Lopoliths4. Phacoliths

Answer» Correct Answer - Option 1 : Batholiths

The correct answer is Batholiths.

The lava that is released during volcanic eruptions on cooling develops into igneous rocks.
Depending on the location of the cooling of the lava, igneous rocks are classified as volcanic rocks (cooling at the surface) and plutonic rocks (cooling in the crust).
The lava that cools within the crustal portions assumes different forms called intrusive forms. They are:
- Batholiths
  - A large body of magmatic material that cools in the deeper depth of the crust develops in the form of large domes.
  - They appear on the surface only after the denudational processes remove the overlying materials.
  - They cover large areas, and at times, assume depth that may be several km.
  - Batholiths are the cooled portion of magma chambers.
- Lacoliths
  - These are large dome-shaped intrusive bodies with a level base and connected by a pipe-like conduit from below.
  - It resembles the surface volcanic domes of composite volcano, only these are located at deeper depths.
  - It can be regarded as the localised source of lava that finds its way to the surface.
- Lapoliths
  - As and when the lava moves upwards, a portion of the same may tend to move in a horizontal direction wherever it finds a weak plane.
  - In case it develops into a saucer shape, concave to the sky body, it is called lapolith.
- Phacoliths
  - A wavy mass of intrusive rocks, at times, is found at the base of synclines or at the top of anticline in folded igneous country.
  - Such wavy materials have a definite conduit to source beneath in the form of magma chambers. These are called the phacoliths.

Discussion

8012.	Most heat labile immunoglobulin is (A) Ig G (B) Ig A (C) Ig M (D) Ig D
Answer» Most heat labile immunoglobulin is Ig D.

Discussion

8013.	Write the name and molecular formula of the fourth member of alkane series
Answer» The fourth member of the alkane series is butane C₄H₁₀.

Discussion

8014.	Choose the right order to make up a story.1. They give us much information about history. 2. He wrote about the everyday life of the common people and problems of kings and queens. 3. W. Shakespeare wrote 37 plays, dramas, tragedies and comedies. 4. His plays help us to understand people. 5. For example: Hamlet, King Lear. A) 3,5,2,4,1 B) 2,4,1,5,3 C) 4,1,2,3,5 D) 2,5,1,4,3 E) 4,5,1,3,2
Answer» Correct option is A) 3,5,2,4,1

Discussion

8015.	Choose the right order to make up a story.1. Her father understood that she boiled the egg for the first time in her life. 2. He took up a newspaper and read for ten minutes. 3. Father asked Kate to boil an egg soft for his breakfast. 4. Kate answered that it wasn't ready because it was still very hard. 5. Then he asked Kate if the egg was ready. A) 3,2,5,4,1 B) 4,2,3,1,5 C) 2,4,3,1,5 D) 5,3,1,2,4 E) 1,3,4,5,2
Answer» Correct option is A) 3,2,5,4,1

Discussion

8016.	I hate it when my boiled egg ______ properly. A) not done B) isn’t done C) wasn’t done D) won’t be done
Answer» Correct option is B) isn’t done

Discussion

8017.	An example of an electrolyte is- (a) Sugar(b) Sodium acetat(c) Urea(d) Benzene
Answer» An example of an electrolyte is Sodium acetat

Discussion

8018.	Consider the following processes :I. Dilution of sulphuric acidII. Sublimation of dry iceIII. Condensation of water vapoursIV. Dissolution of ammonium chloride in waterThe endothermic process(es) is/are :(a) I and III(b) II only(c) III only(d) II and IV
Answer» Correct answer is (d) II and IV (i) Whenever, concentrated H₂SO₄ is diluted with water to obtain dilute H₂SO₄ acid, Huge amount of Heat released. that's why it is exothormic process. (ii) In sublimation, substance changes its physical state from solid to gas, without going in liquid state. Thus, to change the physical state from solid to liquid we have to require heat energy. Hence, it is endothermic process. (iii) Condensation of water vapours are gives up heat energy. Hence it is a exothermic process. (iv) NH₄Cl(s) \(\longrightarrow\) NH₄(aq) + Cl^-(aq) ΔH = +ve On dissolution of ammonium chloride in water, the temperature of water decreases. it means on dissolution of NH₄Cl some heat absorbs from water. Hence, it is a endothermic process.

8018.

Consider the following processes :I. Dilution of sulphuric acidII. Sublimation of dry iceIII. Condensation of water vapoursIV. Dissolution of ammonium chloride in waterThe endothermic process(es) is/are :(a) I and III(b) II only(c) III only(d) II and IV

Answer»

Correct answer is (d) II and IV

(i) Whenever, concentrated H₂SO₄ is diluted with water to obtain dilute H₂SO₄ acid, Huge amount of Heat released. that's why it is exothormic process.

(ii) In sublimation, substance changes its physical state from solid to gas, without going in liquid state.

Thus, to change the physical state from solid to liquid we have to require heat energy.

Hence, it is endothermic process.

(iii) Condensation of water vapours are gives up heat energy. Hence it is a exothermic process.

(iv) NH₄Cl(s) \(\longrightarrow\) NH₄(aq) + Cl^-(aq) ΔH = +ve

On dissolution of ammonium chloride in water, the temperature of water decreases. it means on dissolution of NH₄Cl some heat absorbs from water.

Hence, it is a endothermic process.

Discussion

8019.	0.2 M NaOH is titrated with 100 ml 0.2 M `CH_(3)` COOH in a conducitivity cell. The data obtained were plotted as following The pH of solution in conductivity cell is 9 at point B. Calculate pH of conductivity cell when 100 ml 0.1 M HCl added in resulting solution present in conducitivity cell at point B.
Answer» Correct Answer - 5 `CH_(3)COOH(aq)+NaOH(aq)rarrCH_(3)COONa(g)+H_(2)O` `{:(,(0.2xx100)/(1000),(0.2xx100)/(1000)," "0," "0),(," "0,0,0.02," "0.02):}` `pH=9=(1)/(2)(pKw+pKa+log .(0.02)/(0.2))` ` 18=14+pKa-1` `pKa=5` `CH_(3)COONa(aq)+HCl(aq)rarrCH_(3)COOH(aq)+NaCl(aq)` `{:(,0.02,(100xx0.1)/(1000)=0.01,0,0),(,0.01," "0,0.01,0.01):}` Acidic buffer `pH=pKa+log.(CB)/(CA)` `pH=5+log.(0.01)/(0.01)` `ph=5`

Discussion

8020.	Increasing order of bond angle of `(Cl_(2)O, ClO_(2), Cl_(2)O_(7), I_(3)^(ɵ))` isA. `Cl_(2)O lt ClO_(2) lt Cl_(2)O_(7) lt I_(3)^(ɵ)`B. `Cl_(2)O lt ClO_(2) lt I_(3)^(ɵ) lt Cl_(2)O_(7)`C. `I_(3)^(ɵ) lt Cl_(2)O_(7) lt ClO_(2) lt Cl_(2)O`D. `Cl_(2)O lt Cl_(2)O_(7) lt ClO_(2) lt I_(3)^(ɵ)`
Answer» Correct Answer - D

Discussion

8021.	If `61.25 gm` of `K ClO_(3)` reacts with excess of red phosphorus, what mass of tetraphosphorous dioxide `(P_(4) O_(10))` would be produced. `K ClO_(3) (s) + P_(4) (s) rarr P_(4) O_(10) (s) + K Cl (s)`A. `142 gm`B. `426 gm`C. `14.2 gm`D. `32.6 gm`
Answer» Correct Answer - B `10 KClO_(3) (s) + 3P_(4) (s) rarr 3 P_(4)O_(10) (s) + 10 KCl (s)` `61.25 gm` `n = (61.25)/(122.5)` `{:(n = (1)/(2) " mole" ,n = (3)/(10) xx (1)/(2),),(,n = (3)/(20) " mole",):}` mass of `P_(4)O_(10) = (3)/(20) (3 1 xx 4 + 10 xx 16)` `= (3)/(20) (284)` `= 14.2 xx 3` `= 32.6 gm`

Discussion

8022.	For the following compounds, the correct statement(s) with respect to nucleophilic substitution reactions is(are)(A) I and III follow SN1 mechanism (B) I and II follow SN2 mechanism (C) Compound IV undergoes inversion of configuration (D) The order of reactivity for I, III and IV is: IV > I > III
Answer» (A) I and III follow S_N1 mechanism (B) I and II follow S_N2 mechanism (C) Compound IV undergoes inversion of configuration (D) The order of reactivity for I, III and IV is: IV > I > III Benzylic and 3° halides both follow S_N1 mechanism. Benzylic and 1° halides both follow S_N2 mechanism. Benzylic 2° halides can undergo inversion of configuration. The order of reactivity would be IV > I > III if both S_N1 and S_N2 are considered suitably for substrates.

8022.

For the following compounds, the correct statement(s) with respect to nucleophilic substitution reactions is(are)(A) I and III follow SN1 mechanism (B) I and II follow SN2 mechanism (C) Compound IV undergoes inversion of configuration (D) The order of reactivity for I, III and IV is: IV > I > III

Answer»

(A) I and III follow S_N1 mechanism

(B) I and II follow S_N2 mechanism

(C) Compound IV undergoes inversion of configuration

(D) The order of reactivity for I, III and IV is: IV > I > III

Benzylic and 3° halides both follow S_N1 mechanism.

Benzylic and 1° halides both follow S_N2 mechanism.

Benzylic 2° halides can undergo inversion of configuration.

The order of reactivity would be IV > I > III if both S_N1 and S_N2 are considered suitably for substrates.

Discussion

8023.	Which of the following statements about physical adsorption is correct ?A. It is usually monolayerB. It is reversible in natureC. It involves van der Waals interactions between adsorbent and adsorbateD. It involves small value of adsorption
Answer» Correct Answer - A Physical adsorption is a multilayer phenomenon.

Discussion

8024.	If ∆G°= –2.3RT log Keq, the free energy for the reaction will be A BC + 10moles 10moles 10moles (A) –4.6 RT (B) –2.3 RT (C) +2.3 RT (D) +4.6 RT
Answer» Correct option (C) +2.3 RT

Discussion

8025.	When a graph is plotted between log `x//m` and log p, it is striaght line with an angle `45^(@)` and intercept `0.3010` on y-axis. If initial pressure is `0.3` atm, what will be the amount of gas adsorbed per gm of adsorbent?A. 0.4B. 0.6C. 0.8D. 0.1
Answer» Correct Answer - B `"log"x/m="log"K+1/n"log"Pimplies 1/n=tan 45^@ implies n=1 implies "log" K=0.3010,K=2 implies x/m=2xx(0.3)^1 implies x=0.6`

Discussion

8026.	The following sets of three vectors act on a body. Whose resultant cannot be zero ?A. `10, 10, 10`B. `10, 10, 20`C. `10, 20, 20`D. `10, 20, 40`
Answer» Correct Answer - D For zero resultant, sum of any of any two forces `ge` remaining force

Discussion

8027.	How many minimum number of vectors in different planes can be added to give zero resultant?
Answer» The correct option is (3) 4. Explanation: The required number of vectors is 4. suppose A,B,C, D are four vectors and no three of them are coplaner. if the resultant of A and B be X, and resultant of C and D be Y. if X, and Y be equal in magnitude but in opposing directions, that's the only way the resultant of A, B, C, D be zero, without any three of them being in the same plane. Correct answer is 4 Four vectors in different planes may give zero resultant.

8027.

How many minimum number of vectors in different planes can be added to give zero resultant?

Answer»

The correct option is (3) 4.

Explanation:

The required number of vectors is 4. suppose A,B,C, D are four vectors and no three of them are coplaner. if the resultant of A and B be X, and resultant of C and D be Y. if X, and Y be equal in magnitude but in opposing directions, that's the only way the resultant of A, B, C, D be zero, without any three of them being in the same plane.

Correct answer is 4

Four vectors in different planes may give zero resultant.

Discussion

8028.	Match the following
Answer» a. (c) b. (d) c. (b) d. (a)

8028.

Match the following

Answer»

a. (c)

b. (d)

c. (b)

d. (a)

Discussion

8029.	2. The displacement of a particle as a function of time is shown in the figure. The figure shows that[CPMT 1970, 86](a) The particle starts with cecrand velocity but the motion is retarded and finally the particle stops(b) The velocity of the particle is constant throughout(c) The acceleration of the particle is constant throughout.(d) The particle starts with constant velocity, then motion is accelerated and finally the particle moves with another constant velocity
Answer» I want answer

Discussion

8030.	A car starts from P and follows the path as shown in figure. Finally car stops at R. If the distance travelled is s and magnitude of displacement of the car is d then value of `(3s)/(4d)`. `[a = 7m, b = 8m " and " r = (11)/(pi) m " take " pi = (22)/(7)]`
Answer» Correct Answer - 1 Distance travelled by the car `= 48 m`, Displacement of the car `= 36 m`

Discussion

8031.	A particle moves with an initial velocity `V_(0)` and retardation `alpha v` , where `alpha` is a constant and v is the velocity at any time t. Velocity of particle at time is :A. `v = alpha t^(2)`B. `v = V_(0) - alpha t`C. `v = (V_(0))/(ln alpha t)`D. `v = V_(0)e^(-alpha t)`
Answer» Correct Answer - B Velocity of ………….. `(dv)/(dt) = -alpha v` `overset(v)underset(v_(0))int (dv)/(v) = -alpha overset(t)underset(0)int dt` `\|l nv\|_(v_(0)^(v)= -alpha\|t\|_(0)^(t)` In `(V)/(V_(0))= - alpha t` `V = V = V_(0)e^(-alpha t)`

Discussion

8032.	A particle moves with an initial velocity `V_(0)` and retardation `alpha v` , where `alpha` is a constant and v is the velocity at any time t. total distance covered by the particle isA. `(v_(0))/(2alpha)`B. `(v_(0))/(alpha)`C. `(3v_(0))/(2alpha)`D. None of these
Answer» Correct Answer - C Total distance …………… Retardation `=alpha V` ltbgt `V(dv)/(ds)= -alpha V implies overset(v)underset(v_(0))int dv= -alpha overset(s)underset(0)int ds` `V-V_(0)= -alpha(S-0)` `V = v_(0)-alpha S` when particle stops `V = 0` `V_(0)-alpha s = 0` `S = (V_(0))/(alpha)`

Discussion

8033.	A particle moves with an initial velocity `V_(0)` and retardation `alpha v` , where `alpha` is a constant and v is the velocity at any time t. After how much time, speed of particle decreases by `75%`A. `(2l n2)/(alpha)`B. `(l n(4//3))/(alpha)`C. `(3V_(0))/(4alpha)`D. `(e^(4))/(alpha)`
Answer» Correct Answer - D After how …………. `V = (V_(0))/(4) implies V_(0)e^(-alpha t)= (V_(0))/(4)` `-alpha t = l n(1)/(4) implies t = (2l n2)/(alpha)`

Discussion

8034.	The displacement (x) of particle depends on time (t) as `x = alpha t^(2) - beta t^(3)`.A. The particle will return to its starting point after time `alpha//beta`B. The particle will come to rest after time `2alpha//3beta`C. The initial velocity of the particle was zero but its initial acceleration was not zeroD. No net force will act on the particle at `t = alpha//3beta`
Answer» Correct Answer - A::B::C::D `x= alpha t^(2) - beta t^(3)` for `x = 0, alpha t^(2) - beta t^(3) = 0` `:. t = (alpha)/(beta)` `(dx)/(dt) = 2 alpha t - 3 beta t^(2)` Particle at rest `v = 0` `2 alpha t - 3 beta t^(2) = 0` `t = (2)/(3) (alpha)/(beta)` `(d^(2)x)/(dt^(2)) = 2 alpha - 6 beta t` at `t = 0 " " a = 2 alpha, " at " t = 0, v = 0` for no net force, `(a = 0)` `2 alpha - 6 beta t = 0, t = (alpha)/(3 beta)`

Discussion

8035.	A particle has initial velocity `12 m//s`. It moves due to a constant force along the line of velocity which initially produces retardation of `8 m//s^(2)`. Then :A. the distance travelled in first 3 second is 0 mB. the distance travelled in first 3 second is `36 m`C. the distance travelled in first 3 second is `18 m`D. displacement in first 3 second is 0 m
Answer» Correct Answer - C::D `u = 12 m//s` `a = -8 //s^(2)` Displacement `vec(S) = vec(u) t + (1)/(2) vec(a) t^(2)` `= 12 xx 3 + (1)/(2) xx (-8) xx 3^(2) = 0` Distance `v = u + at` `0 = 12 - 8t` `t = (3)/(2)s at t = (3)/(2)s` velocity becomes zero & direction of motion reverses Distance `t = 0 " to " t = (3)/(2)s` `S = ut + (1)/(2) at^(2) = 9 m` Distance `t (3)/(2)s "to" 3s` `S = 9m` Total distance `= 9 + 9 = 18 m`

Discussion

8036.	Which of th efollowing is/are correct regarding vectors `vec(A) = 2hat(i) + hat(j)` and `vec(B) = 2hat(i) - 4 hat(j)`.A. Angle between `vec(A)` and `vec(B)` is acuteB. Angle between `vec(A) + vec(B)` and `vec(A)` is acuteC. `hat(k)` is a unit vector perpendicular to `vec(A)`D. `(hat(i) - 2 hat(j))/(sqrt5)` is a unit vector perpendicular to `vec(A)`
Answer» Correct Answer - B::C::D (A) `vec(A).vec(B) = AB cos theta = 0` `rArr theta = 90^(@)` Angle between `vec(A)` & `vec(B)` in `90^(@)` (B) `vec(A) + vec(B) = 4 hat(i) - 3 hat(j)` `(vec(A) + vec(B)).vec(A) = 8 - 3` `= 5 (+ve)` So, angle between `vec(A) + vec(B)` & `vec(A)` in acute (C ) z-axis is perpendicular to `x - y` plae `\|(hat(i) - 2 hat(j))/(sqrt5)\| = 1` `(2 hat(i) + hat(j)).((hat(i) - 2 hat(j))/(sqrt5)) = 0`

Discussion

8037.	Which of th efollowing statement is correct ?A. `LiOH gt NaOH gt KOH gt RbOH` (solubility orderB. `Be(OH)_(2) gt Mg(OH)_(2) gt Ca(OH)_(2) gt Sr(OH)_(2)` (basic strength order)C. `LI lt K lt Na lt Rb lt Cs` (density order)D. `Li^(+) gt Na^(+) gt K^(+) gt Rb^(+) gt Cs^(+)` (ionic mobilty in aqueous medium)
Answer» Correct Answer - C

Discussion

8038.	Which of the following statement is incorrect about the structure of `B_(2)Hs` isA. It has four `2C - 2e^(-)` bond and two `3C - 2e^(-)` bond.B. The hybridization of each boron atom is `sp^(3)`C. All hydrogens in `B_(2)H_(6)` lie in the same plane.D. Terminal bonds are shorter than bridged bonds.
Answer» Correct Answer - C

Discussion

8039.	Which of the following graph is correct for real gases other than hydrogen and helium at `0^(@)` ?A. B. C. D.
Answer» Correct Answer - C

Discussion

8040.	In an ionic compound `XY_(2)O_(4)` oxide ions are arranged in ccp. Cations `X` are present in octahedral voids.Cations `Y` are equally distributed between octahedral voids occupied isA. `(1)/(2)`B. `(1)/(4)`C. `(1)/(6)`D. `(1)/(8)`
Answer» Correct Answer - A

Discussion

8041.	give a relationship between nearest neighbour distance(d),radius of atom(r), edge of unit cell(a), for fcc and BCC crystal
Answer» Simple cubic - Nearest dist - a, radius a/2 , z(no of atoms per unit cel) = 1 Fcc - Nd = a/(2)^1/2 , radius = a/2 root2 z=4 Bcc- Nd- a root 3 /2 ; radius = a root3 /4 z= 2 For the derivation and detailed answer must refer to master NCERT book.

8041.

give a relationship between nearest neighbour distance(d),radius of atom(r), edge of unit cell(a), for fcc and BCC crystal

Answer»

Simple cubic -

Nearest dist - a, radius a/2 , z(no of atoms per unit cel) = 1

Fcc -

Nd = a/(2)^1/2 , radius = a/2 root2 z=4

Bcc-

Nd- a root 3 /2 ; radius = a root3 /4 z= 2

For the derivation and detailed answer must refer to master NCERT book.

Discussion

8042.	(a) Dendrite → axon → axonal end → cell body(b) Cell body → dendrite → axon → axonal end(c) Dendrite → cell body → axon → axonal end(d) Axonal end → axon → cell body → dendrite
Answer» (c) Dendrite → cell body → axon → axonal end

Discussion

8043.	(i) The charge on the positive rays depends upon __________ of gas in the __________ tube(ii) The anode rays (positive rays) obtained from ____________ gas, consists of only protons.
Answer» i) The charge on the positive rays depends upon "Nature" of gas in the "Cathode ray" Tube. ii) The anode rays (positive rays) obtained from "Hydrogen" gas, consists of only protons.

8043.

(i) The charge on the positive rays depends upon of gas in the tube(ii) The anode rays (positive rays) obtained from ____ gas, consists of only protons.

Answer»

i) The charge on the positive rays depends upon "Nature" of gas in the "Cathode ray" Tube.

ii) The anode rays (positive rays) obtained from "Hydrogen" gas, consists of only protons.

Discussion

8044.	Define'nerve impulse'. Which structure in a neuron helps to conduct a nerve impulse(i) towards the cell body(ii) away from the cell body?
Answer» The information passing through neurons is in the form of chemical and electrical signals, called nerve impulse. (i) Towards the cell body: Dendrites. (ii) Away from the cell body: Axon.

8044.

Define'nerve impulse'. Which structure in a neuron helps to conduct a nerve impulse(i) towards the cell body(ii) away from the cell body?

Answer»

The information passing through neurons is in the form of chemical and electrical signals, called nerve impulse.

(i) Towards the cell body: Dendrites.

(ii) Away from the cell body: Axon.

Discussion

8045.	Identify the incorrect match:Name IUPC Offical Name(a) Unnilunium(i) Mendelevium(b) Unnitrium(ii) Lawrencium(c) Unnihexium(iii) Seaborgium(d) Unununnium(iv) Darmstadtium(1) (d), (iv) (2) (a), (i) (3) (b), (ii) (4) (c), (iii)
Answer» (1) (d), (iv) Unununium (Z = 111) it is Rontgentum (Rg) not darmstadtium.

8045.

Identify the incorrect match:Name IUPC Offical Name(a) Unnilunium(i) Mendelevium(b) Unnitrium(ii) Lawrencium(c) Unnihexium(iii) Seaborgium(d) Unununnium(iv) Darmstadtium(1) (d), (iv) (2) (a), (i) (3) (b), (ii) (4) (c), (iii)

Answer»

(1) (d), (iv)

Unununium (Z = 111) it is Rontgentum (Rg) not darmstadtium.

Discussion

8046.	Which of the following is not extracted from its sulphide ore?(a) Aluminium(b) Zinc(c) Copper(d) None of these
Answer» Correct option is (a) Aluminium Aluminium is extracted from its oxide ore (Bauxite) by electrolysis

8046.

Which of the following is not extracted from its sulphide ore?(a) Aluminium(b) Zinc(c) Copper(d) None of these

Answer»

Correct option is (a) Aluminium

Aluminium is extracted from its oxide ore (Bauxite) by electrolysis

Discussion

8047.	The `E^(0)(M^(2+)//M)` value for copper is positive `(+0.34V)`. What is possibly the reason for this?
Answer» `E^(ɵ)((M^(2+))/(M))` for any metal is related to the sum of the enthalpy changes taking place in the following steps: `M_(s)overset(triangle_aH^(ɵ))toM_(g)(triangle_aH^(ɵ)=` enthalpy of atomisation) `M_(g)overset(triangle_iH^(ɵ))toM_(g)^(2+)(triangle_iH^(ɵ)=`ionisation enthalpy) `M_(g)^(2+)+aq.overset(triangle_(hyd)H^(ɵ))toM_(aq)^(2+)(triangle_(hyd)H^(ɵ)=`hydration enthalpy) Copper has high (positive) enthalpy of atomisation and low (negative) enthalpy of hydration. Hence `E^(ɵ)((Cu^(2+))/(Cu))` is positive.

Discussion

8048.	Which of the 3d-seres of the transition metals exhibits the largest number of oxidation states ?
Answer» Manganese `(Z=25)`, as its atom has the maximum number of unpaired electrons.

Discussion

8049.	In the series `Sc(Z=21)` to `Zn(Z=30)` the enthalpy of atomisation of zinc is the lowest, i.e., 126 kJ `mol^(-1)`. Why?
Answer» In the formation of metallic bonds, no electrons from 3d-orbitals are involved in case of zinc, while in all other metals of the 3d series, electrons from the d-orbitals are always invilved in the formation of metallic bonds.

Discussion

8050.	Write the electronic configuration of Fe3+ on the basis of this.
Answer» 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵

Discussion

Explore topic-wise InterviewSolutions in .

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Match the following

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A particle moves with an initial velocity `V_(0)` and retardation `alpha v` , where `alpha` is a constant and v is the velocity at any time t. Velocity of particle at time is :A. `v = alpha t^(2)`B. `v = V_(0) - alpha t`C. `v = (V_(0))/(ln alpha t)`D. `v = V_(0)e^(-alpha t)`

A particle moves with an initial velocity `V_(0)` and retardation `alpha v` , where `alpha` is a constant and v is the velocity at any time t. total distance covered by the particle isA. `(v_(0))/(2alpha)`B. `(v_(0))/(alpha)`C. `(3v_(0))/(2alpha)`D. None of these

A particle moves with an initial velocity `V_(0)` and retardation `alpha v` , where `alpha` is a constant and v is the velocity at any time t. After how much time, speed of particle decreases by `75%`A. `(2l n2)/(alpha)`B. `(l n(4//3))/(alpha)`C. `(3V_(0))/(4alpha)`D. `(e^(4))/(alpha)`

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In an ionic compound `XY_(2)O_(4)` oxide ions are arranged in ccp. Cations `X` are present in octahedral voids.Cations `Y` are equally distributed between octahedral voids occupied isA. `(1)/(2)`B. `(1)/(4)`C. `(1)/(6)`D. `(1)/(8)`

give a relationship between nearest neighbour distance(d),radius of atom(r), edge of unit cell(a), for fcc and BCC crystal

(a) Dendrite → axon → axonal end → cell body(b) Cell body → dendrite → axon → axonal end(c) Dendrite → cell body → axon → axonal end(d) Axonal end → axon → cell body → dendrite

(i) The charge on the positive rays depends upon __________ of gas in the __________ tube(ii) The anode rays (positive rays) obtained from ____________ gas, consists of only protons.

Define'nerve impulse'. Which structure in a neuron helps to conduct a nerve impulse(i) towards the cell body(ii) away from the cell body?

Identify the incorrect match:Name IUPC Offical Name(a) Unnilunium(i) Mendelevium(b) Unnitrium(ii) Lawrencium(c) Unnihexium(iii) Seaborgium(d) Unununnium(iv) Darmstadtium(1) (d), (iv) (2) (a), (i) (3) (b), (ii) (4) (c), (iii)

Which of the following is not extracted from its sulphide ore?(a) Aluminium(b) Zinc(c) Copper(d) None of these

The `E^(0)(M^(2+)//M)` value for copper is positive `(+0.34V)`. What is possibly the reason for this?

Which of the 3d-seres of the transition metals exhibits the largest number of oxidation states ?

In the series `Sc(Z=21)` to `Zn(Z=30)` the enthalpy of atomisation of zinc is the lowest, i.e., 126 kJ `mol^(-1)`. Why?

Write the electronic configuration of Fe3+ on the basis of this.

(i) The charge on the positive rays depends upon of gas in the tube(ii) The anode rays (positive rays) obtained from ____ gas, consists of only protons.