100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS

1.	Voltmeter measures
Answer» voltmeter, instrument that measures voltages of either direct or alternating electric current on a scale usually graduated in volts, millivolts (0.001 volt), or kilovolts (1,000 volts).

Discussion

2.	S. I. unit of surface density of charge is -(A) Coulomb x metre(B) Coulomb x (metre)2 (C) Coulomb x \(\frac{1}{\text{metre}}\)(D) Coulomb x \(\left(\frac{1}{\text{(metre)}}\right)^2\)
Answer» Correct answer is (D) Coulomb x \(\left(\frac{1}{\text{(metre)}}\right)^2\)

Discussion

3.	Shall we request the committee ____ our suggestion again? A) consider B) considering C) to consider D) considerd
Answer» Correct option is C) to consider

Discussion

4.	The value of ∈0 is -(A) 8.85 x 10-12 F/m(B) 8.85 x 10-13 F/m(C) 8.85 x 10-16 F/m(D) 8.85 x 10-20 F/m
Answer» Correct answer is (A) 8.85 x 10^-12 F/m

Discussion

5.	Which of the following is correct for electric intensity at a distance ‘r’ from charge q ?(A) \(E=\frac{1}{4\pi \in_0}.\frac{q}{r}\)(B) \(E=\frac{1}{4\pi \in_0}.\frac{q}{r^2}\)(C) \(E=\frac{1}{4\pi \in_0}.\frac{q^2}{r}\)(D) \(E=\frac{1}{4\pi \in_0}.\frac{q}{r^3}\)
Answer» Correct answer is (B) \(E=\frac{1}{4\pi \in_0}.\frac{q}{r^2}\)

Discussion

6.	Which series comes in visible region of hydrogen spectrum? (a) Lyman series(b) Balmer series(c) Paschen series(d) Brackett series
Answer» Correct answer is (b) Balmer series

Discussion

7.	Write the decimal number 25 in binary.(a) (1100)2(b) (1001)2(c) (11001)2(d) (11101)2
Answer» Correct answer is (c) (11001)₂

Discussion

8.	Statement -I: Photon cannot be deflected by magnetic and electric field.Statement II: Rest mass of photon is zero. Of these statements: (a) Both the Statements are true and Statement-II is the correct explantion of Statement -I(b) Both the statements are true,but Statement -II is not the correct explanation of Statement -I(c) Statement -I is true, but Statement -II is false.(d) Statement I is false, but Statement -II is true.
Answer» (b) Both the statements are true,but Statement -II is not the correct explanation of Statement -I

Discussion

9.	The equivalent capacity between A and B is(a) (20/9)μF(b) 9μF(c) 1 μF(d) (1/9)μF
Answer» Correct answer is (a) (20/9)μF

Discussion

10.	The electric flux over the surface of a spere if it is charged with 10μC is-(a) 36π x 104 Nm2/C (b) 36π x 10-4 Nm2/C (c) 36π x 106 Nm2/C (d) 36π x 106 Nm2/C
Answer» Correct answer is (a) 36π x 10⁴ Nm²/C

Discussion

11.	Brewster's law is(a) μ = sin ip(b) μ = cos ip(c) μ = tan ip(d) μ = tan2 ip.
Answer» Correct answer is (c) μ = tan ip

Discussion

12.	Figure shows an electrical calorimeter to determine specific heat capacity of an unknown liquid, First of all, the mass of empty calorimeter (a copper container) is measured and suppose it is `m_(1)`. Then the unknown liquid is poured in it. Now the combined mass of calorimeter+liquid system is measured and let it be `m_(2)`. So the mass of liquid is `(m_(2)-m_(1))`. Initially both were at room temperature (`theta_(0)`). Now a heater is immeresed in if for time interval `t`. The voltage drop across the heater is `V` and current passing through it is `I`. Due to heat supplied, the temperature of both the liquid and calorimeter will rise simultaneously. After `t sec`, heater was switched off, and final temperature is `theta_(r)`. If there is no heat loss to surroundings. Heat supplied by the heater=Heat absorbed by the liquid+heat absorbed by the calorimeter `(VI)t=(m_(2)-m_(1))S_(1)(theta_(f)-theta_(0))+m_(1)S_(c)(theta_(f)-theta_(0))` The specific heat of the liquid `S_(1)=(((VI)t)/(theta_(f)-theta_(0))-m_(1)S_(c))/((m_(2)-m_(1)))` Radiation correction: There can be heat loss to environment. To compensate this loss, a correction is introduced. Let the heater was on for `t sec`, and then it is switched off. Now the temperature of the mixture falls due to heat loss to environment. The temperature of the mixture is measured `t//2 sec`. after switching off. Let the fall in temperature during this time is `varepsilon` Now the corrected final temperature is taken as `theta_(f)=theta_(f)+varepsilon` If mass and specific heat capacity of calorimeter is negligible, what would be maximum permissible error in `S_(l)`. Use the date mentioned below. `m_(1)to`, `S_(l)to0`, `m_(2)=1.00kg`, `V=10.0V`, `I=10.0A`, `t=1.00xx10^(2)sec`, `theta_(0)=15^(@)C`, Corrected `theta_(1)=65^(@)C`A. `4%`B. `5%`C. `8%`D. `12%`
Answer» Correct Answer - C If `m_(1) to 0`, `S_(l) to 0`, `S_(l)=(VIt)/(m_(2)(theta_(f)-theta_(0)))` `(dS_(l))/(S_(l))=(DeltaV)/(V)+(DeltaI)/(I)+(Deltat)/(t)+(Deltam_(2))/(m_(2))+(Deltatheta_(r)+Deltatheta_(0))/(theta_(r)-theta_(0))` `=(0.1)/(10.0)+(0.1)/(10.0)+(0.01xx10^(2))/(1.00xx10^(2))+(0.01)/(1.00)+(1+1)/(50)=8%`

Discussion

13.	Diamagnetic substances have relative permeability_____________(a) Greater than 1(b) Less than 1(c) Equal to 1(d) Zero
Answer» Correct choice is (b) Less than 1 For explanation: A diamagnetic material creates a magnetic field opposing that of the external magnetic field and it repels the external magnetic field. Hence it has relative permeability less than 1.

Discussion

14.	Which of the following is correct ?(A) (4)10 = (100)2 (B) (4)10 = (10)2 (C) (4)10 = (1001)2 (D) (4)10 = (111)2
Answer» Correct answer is (A) (4)₁₀ = (100)₂

Discussion

15.	Number of neutrons in \(^{238}_{92}U\) will be -23892U(A) 92 (B) 238 (C) 146 (D) 330
Answer» Correct answer is (C) 146

Discussion

16.	In `u-v` method, we require the distance between object or image from the pole (vertex) of the mirror (actual distance). But practically we measure the distance between the indices `A` and `B`. (Observed distance). Which need not exactly co-inside with object and pole, there can be a slight mismatch called index error, which will be constant for every observation. Index error=Observed distance-Actual distance(Just like zero error in screw guage, it is the excess reading). To determine index error, mirror and object needle and placed at arbitary position. For measuring actual distance, a knitting needle is just fitted between the pole of mirror and object needle `O`. The length of knitting needle will give the actual object distance while the seperation between indices `A` and `B` at that instant is the observed distance. So index error is- `e=`Observed distance-Actual distance `=` Separation between indices `A` and `B`- Length of knitting neddle once we get `e`, in every observation, we get Actual distance=Observed distance (separation between the indices)- Excess reading(e) There is an another term, Index corraction which is invert of index error. Index correction=-index error In some observation, the observed object distance (Separation between indices of object needle and mirror) is `30.2cm`, and the observed image distance is `19.9cm`. Using index correction from previous two equations, estimate the focal distance of the concave mirror!A. `36cm`B. `20cm`C. `12cm`D. `8cm`
Answer» Correct Answer - C `u=30.2-0.2` (excess reading) `=30.0 cm` `v=19.9-(-0.1)` (excess reading) `=20.0 cm` `(1)/(f)+(1)/(v)+(1)/(u)impliesf=12.0cm`

Discussion

17.	In `u-v` method, we require the distance between object or image from the pole (vertex) of the mirror (actual distance). But practically we measure the distance between the indices `A` and `B`. (Observed distance). Which need not exactly co-inside with object and pole, there can be a slight mismatch called index error, which will be constant for every observation. Index error=Observed distance-Actual distance(Just like zero error in screw guage, it is the excess reading). To determine index error, mirror and object needle and placed at arbitary position. For measuring actual distance, a knitting needle is just fitted between the pole of mirror and object needle `O`. The length of knitting needle will give the actual object distance while the seperation between indices `A` and `B` at that instant is the observed distance. So index error is- `e=`Observed distance-Actual distance `=` Separation between indices `A` and `B`- Length of knitting neddle once we get `e`, in every observation, we get Actual distance=Observed distance (separation between the indices)- Excess reading(e) There is an another term, Index corraction which is invert of index error. Index correction=-index error To find index error for `v`, when the same knitting needle is adjusted between the pole and the image needle, the separation between the indices of image needle and mirror was found to be `19.9cm`. Index error for `v` isA. `0.1cm`B. `-0.1cm`C. `0.2cm`D. `-0.2cm`
Answer» Correct Answer - B `e=19.9cm-20.0cm=-0.1cm`

Discussion

18.	In `u-v` method, we require the distance between object or image from the pole (vertex) of the mirror (actual distance). But practically we measure the distance between the indices `A` and `B`. (Observed distance). Which need not exactly co-inside with object and pole, there can be a slight mismatch called index error, which will be constant for every observation. Index error=Observed distance-Actual distance(Just like zero error in screw guage, it is the excess reading). To determine index error, mirror and object needle and placed at arbitary position. For measuring actual distance, a knitting needle is just fitted between the pole of mirror and object needle `O`. The length of knitting needle will give the actual object distance while the seperation between indices `A` and `B` at that instant is the observed distance. So index error is- `e=`Observed distance-Actual distance `=` Separation between indices `A` and `B`- Length of knitting neddle once we get `e`, in every observation, we get Actual distance=Observed distance (separation between the indices)- Excess reading(e) There is an another term, Index corraction which is invert of index error. Index correction=-index error To find index error for `u`, when a knitting needle of length `20.0cm` is adjusted between pole and object needle, the sepertion between the indices of object needle and mirror was observed to be `20.2cm`. Index corraction for u isA. `-0.2cm`B. `0.2cm`C. `-0.1cm`D. `0.1cm`
Answer» Correct Answer - B Index error(excess reading)=Observed reading-Actual reading `=20.2-20.0=0.2cm`

Discussion

19.	Bulk modules of elasticity for isobaric process isA. equal to that of isochoric process.B. equal to that of isothermal process.C. zeroD. infinite
Answer» Correct Answer - C

Discussion

20.	Equal temperature difference exists between the ends of two metallic rods 1 and 2of equal length. Their thermal conduetivities are `K_(1)` and `K_(2)` and cross sectional areas are respectively `A_(1)` and `A_(2)`. The condition for equal rate of heat transfer will be-A. `K_(1)A_(2) =K_(2)A_(1)`B. `k_(1)^(2)A_(2)=k_(2)^(2)A_(1)`C. `K_(1)A_(1) =K_(2)A_(2)`D. `K_(1)A_(1)^(2)=K_(2)A_(2)`
Answer» Correct Answer - C `(K_(1)A_(1)Delta0)/(l)=(K_(2)A_(2)Delta0)/(l)` `rArr K_(1)A_(1)=K_(2)A_(2)`

Discussion

21.	Current through the ideal diode is -
Answer» Correct Answer - A

Discussion

22.	The output characteristics of a transistor are shown in the figure. When \( V_{C E} \) is \( 10 V \) and \( I_{C}=4.0 mA \), the value of \( \beta_{d c} \) is:1. 2002. 2503. 3004. 150
Answer» β = ΔI_C / ΔI_B ΔI_B = 30 – 20 I_C = 4mA (reference value given) = 10 μA ΔI_C = = 4.5 – 3 = 1.5mA β = [1.5 × 10^-3] / [10 × 10^-6] = 150

22.

The output characteristics of a transistor are shown in the figure. When \( V_{C E} \) is \( 10 V \) and \( I_{C}=4.0 mA \), the value of \( \beta_{d c} \) is:1. 2002. 2503. 3004. 150

Answer»

β = ΔI_C / ΔI_B

ΔI_B = 30 – 20 I_C = 4mA (reference value given)

= 10 μA

ΔI_C = = 4.5 – 3

= 1.5mA

β = [1.5 × 10^-3] / [10 × 10^-6]

= 150

Discussion

23.	What is the base resistance `R_(B)` in the circuit as shown in figure , if `beta_(d.c.) = 90, V_(BE) = 0.7 V, V_(CE) =4V?` A. `29 K Omega`B. `82 K Omega`C. `108 K Omega`D. `55 K Omega`
Answer» Correct Answer - B `V_(CE)=I_(c)xx2 xx10^(3)+9=4` `I_(c)(5xx10^(-3))/(2) rArr2.5 xx 10^(-3)` `beta=90 (I_(C))/(I_(B))` `I_(beta)=(2.5 xx10^(-3))/(90)` `V_(BE)=-I_(B)R_(B) +3` `0.7 + (2.5 xx 10^(-3))/(50) R_(B) =3` `R_(B)=(2.3xx90)/(2.5xx10^(-3))` `=(2.3 xx 10^(-3))/(25) xx 10^(4)` `rArr (2070)/(25) xx 10^(3)rArr 82 K Omega`

Discussion

24.	From the given figure, name all pairs of parallel lines?
Answer» The pairs of parallel lines are l\|\|m, m\|\|n and n\|\|l

Discussion

25.	To get maximum current through a resistance of `2.5Omega,` one can use m rows of cells, each row having n cells. The internal resistance of each cell is `0.5 Omega` what are the values of n and m, if the total number of cells is 45.A. 3, 15B. 5, 9C. 9,5D. 15,3
Answer» Correct Answer - D d. For maximum current, net resistance of cells must be equal to `2.5 Omega` i.e., `(n(0.5))/m = 25`………….(i) and `m xx n = 45` …………..(ii) Solving we get n = 15, m= 3 .

Discussion

26.	Consider the situation shown in . The wire PQ has a negligible resistance and is made to slide on the three rails with a constant speed of `5 cm s^(-1)` . Find the current in the `10 Omega` resistor when the switch S is thrown to (a) the middle rail (b) the bottom rail. A. zeroB. 2 mAC. 3 mAD. None of these
Answer» Correct Answer - D Here `B=1T, v=5 xx 10^(-2) m//s, R=1 Omega` When the switch is thrown to the middle rail `E=Bvl` `=1 xx 5 xx 10^(-2) V` `=10 xx 10^(-4) =10^(-3)V` Current in the `10 Omega` resistor =`E//R` `(10^(-3))/(10) =10^(-4) = 0.1 mA` The switch is thrown to the lower rail `E=Bvl` `=1 xx 5 xx 10^(-2) xx 4 xx 10^(2) = 20 xx 10^(-4)V` Current `=(20 xx 10^(-4))/(10) = 2 xx 10^(-4) = 0.2 mA`.

Discussion

27.	Any charge given to the battery when taken off the vehicle is called : (a) bench charge (b) step charge (c) float charge (d) trickle charge
Answer» (a) bench charge

Discussion

28.	Floating battery systems are widely used for : (a) power stations (b) emergency lighting (c) telephone exchange installation (d) all of the above
Answer» (d) all of the above

Discussion

29.	The sediment which accumulates at the bottom of a lead-acid battery consists largely of : (a) lead-peroxide (b) lead-sulphate (c) antimony-lead alloy (d) graphite
Answer» (c) antimony-lead alloy

Discussion

30.	The reduction of battery capacity at high rates of discharge is primarily due to : (a) increase in its internal resistance (b) decrease in its terminal voltage (c) rapid formation of PbSO4 on the plates (d) non-diffusion of acid to the inside active materials.
Answer» (c) rapid formation of PbSO₄ on the plates

Discussion

31.	A dead storage battery can be revived by : (a) a dose of H2SO4 (b) adding so-called battery restorer (c) adding distilled water (d) none of the above
Answer» (d) none of the above

Discussion

32.	As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its : (a) lower e.m.f. (b) smaller quantity of electrolyte used (c) higher internal resistance (d) compactness.
Answer» (c) higher internal resistance

Discussion

33.	During the charging and discharging of a nickel iron cell :(a) its e.m.f. remains constant (b) water is neither formed nor absorbed (c) corrosive fumes are produced(d) nickel hydroxide remains unsplit
Answer» (b) water is neither formed nor absorbed

Discussion

34.	Sulphation in a lead-acid battery occurs due to: (a) trickle charging (b) incomplete charging (c) heavy discharging (d) fast charging
Answer» (b) incomplete charging

Discussion

35.	As compared to constant-current system, the constant-voltage system of charging a lead-acid cell has the advantage of :(a) avoiding excessive gassing (b) reducing time of charging (c) increasing cell capacity (d) both (b) and (c).
Answer» (d) both (b) and (c).

Discussion

36.	The active materials of a nickel-iron battery are. (a) nickel hydroxide (b) powdered iron and its oxides (c) 21% solution of caustic potash (d) all of the above.
Answer» (d) all of the above.

Discussion

37.	The capacity of a lead-acid cell does NOT depend on its : (a) rate of charge (b) rate of discharge (c) temperature (d) quantity of active material
Answer» (a) rate of charge

Discussion

38.	The capacity of a cell is measured in : (a) watt-hours (b) watts (c) amperes (d) ampere-hours
Answer» (d) ampere-hours

Discussion

39.	In an isosceles right angled triangle, the perimeter is 20 metre. Find its area. (a) 9,320m2 (b) 8,750m2 (c) 7,980m2 (d) 8,000m2 (e) None of these
Answer» (a) In an isosceles right angled triangle, Area = 23.3 × perimeter² = 23.3 × 20²= 9320 m²

Discussion

40.	√(x-1/x-2
Answer» (-infinty,1]U(2, infinity)

Discussion

41.	If \( f(x)=x^{2} \) and \( g(x)=4 x+1 \) be two real functions then find \( b(i)(f+g)(x) \) (ii) \( (f-g)(x) \), (iii) \( (f \cdot g)(x) \)
Answer» \(f(x) = x^2\) \(g(x) = 4x + 1\) (i) \((f + g) (x) = f(x) + g(x) = x^2 + 4x +1\) (ii) \((f - g)(x) = f(x) - g(x) = x^2 - (4x + 1) = x^2 - 4x - 1\) (iii) \((f.g)(x) = f(x). g(x) = x^2 (4x + 1)\)

41.

If \( f(x)=x^{2} \) and \( g(x)=4 x+1 \) be two real functions then find \( b(i)(f+g)(x) \) (ii) \( (f-g)(x) \), (iii) \( (f \cdot g)(x) \)

Answer»

\(f(x) = x^2\)

\(g(x) = 4x + 1\)

(i) \((f + g) (x) = f(x) + g(x) = x^2 + 4x +1\)

(ii) \((f - g)(x) = f(x) - g(x) = x^2 - (4x + 1) = x^2 - 4x - 1\)

(iii) \((f.g)(x) = f(x). g(x) = x^2 (4x + 1)\)

Discussion

42.	Grandmother lets the children do anything they like, so they are completely ________. A) spoilt B) damaged C) hurt D) injured E) destroyed
Answer» Correct option is A) spoilt

Discussion

43.	The order Orthoptera contains: a. Bed bugs and stink bugs b. Chewing and sucking lice c. Roaches and mantids d. Crickets and grasshoppers
Answer» The order Orthoptera contains Crickets and grasshoppers.

Discussion

44.	Q5. Assertion (A): Change in Profit-sharing Ratio is not a reconstitution of partnership.Reason (R): Winding-up of the firm is reconstitution of business.
Answer» please answer this

Discussion

45.	The living world MCQ pdf
Answer» 1. In majority of higher animals and plants, _____ and _____ are mutually exclusive events. A. growth; nutrition B. nutrition; consciousness C. growth; reproduction D. reproduction; consciousness 2. A group of plants and animals with similar traits of any rank is A. Taxon B. Species C. Genus D. Order 3. Energy flow and energy transformation in a living system follow A. Biogenetic law B. Law of thermodynamics C. Law of limiting factor D. Liebig’s law of minimum 4. The defining characteristic of living beings is A. They reproduce B. They can digest their food C. They respond to external stimuli D. They regenerate 5. In multicellular organisms, _____ refers to the production of progeny possessing features more or less similar to those of parents. A. growth B. reproduction C. metabolism D. consciousness 6. Families are characterized on which of the following features of plant species? A. External morphology B. Anatomy of parts C. Vegetative and reproductive parts D. Seasonal similarities and variations 7. The sum total of all the chemical reactions occurring in our body is known as A. metabolism B. growth C. regeneration D. reproduction 8. Nicotiana is a ————- A. Species B. Sub-species C. Genus D. Class 9. The scientific name of mango is A. Mangifera indica B. Mangifera Indica C. Mangifera indica D. Mangifera Indica 10. Cell division occurs _______ in plants and _______ in animals. A. continuously, only upto a certain age B. only upto a certain age, continuously C. continuously, never D. once, twice Answer: 1. Correct Answer : (C) growth; reproduction Explanation: Growth and reproduction are mutually exclusive events in majority of the higher animals and plants. Growth may be defined as a positive change in size, often over a period of time. Growth can occur as a stage of maturation or a process toward fullness or fulfillment. Reproduction may be defined as the production of progeny possessing features more or less similar to those of parents. 2. Answer: A. Taxon 3. Answer: B. Law of thermodynamics 4. Answer: C. They respond to external stimuli 5. Answer: B. reproduction Explanation: Reproduction ensures the continuity of the species, generation after generation. Genetic variation is created and inherited during reproduction. 6. Answer: C. Vegetative and reproductive parts Explanation: A family is a subdivision of an order consisting of a group of related genera which in turn are composed of groups of related species. Families are characterized on the basis of vegetative and reproductive parts of the plants species. 7. Answer: A. metabolism Explanation: All living organisms are continuously making or breaking biomolecules, such conversions are due to chemical reactions, and sum total of all such chemical reactions, occurring in the body is called metabolism. Each metabolic pathway in the cell is tightly regulated by enzymes. 8. Answer: C. Genus 9. Answer: C. Mangifera indica 10. Answer: A. continuously, only upto a certain age Explanation: All cells arise from pre-existing cells by a process of cell division. Cell division is the phenomenon of production of daughter cell from parent cell. It occurs continuously in plants and only up to a certain age in animals. Practice MCQ Questions for class 11 Biology Chapter-Wise

45.

The living world MCQ pdf

Answer»

1. In majority of higher animals and plants, _____ and _____ are mutually exclusive events.

A. growth; nutrition
B. nutrition; consciousness
C. growth; reproduction
D. reproduction; consciousness

2. A group of plants and animals with similar traits of any rank is

A. Taxon
B. Species
C. Genus
D. Order

3. Energy flow and energy transformation in a living system follow

A. Biogenetic law
B. Law of thermodynamics
C. Law of limiting factor
D. Liebig’s law of minimum

4. The defining characteristic of living beings is

A. They reproduce
B. They can digest their food
C. They respond to external stimuli
D. They regenerate

5. In multicellular organisms, _____ refers to the production of progeny possessing features more or less similar to those of parents.

A. growth
B. reproduction
C. metabolism
D. consciousness

6. Families are characterized on which of the following features of plant species?

A. External morphology
B. Anatomy of parts
C. Vegetative and reproductive parts
D. Seasonal similarities and variations

7. The sum total of all the chemical reactions occurring in our body is known as

A. metabolism
B. growth
C. regeneration
D. reproduction

8. Nicotiana is a ————-

A. Species
B. Sub-species
C. Genus
D. Class

9. The scientific name of mango is

A. Mangifera indica
B. Mangifera Indica
C. Mangifera indica
D. Mangifera Indica

10. Cell division occurs _______ in plants and _______ in animals.

A. continuously, only upto a certain age
B. only upto a certain age, continuously
C. continuously, never
D. once, twice

Answer:

1. Correct Answer : (C) growth; reproduction
Explanation: Growth and reproduction are mutually exclusive events in majority of the higher animals and plants. Growth may be defined as a positive change in size, often over a period of time. Growth can occur as a stage of maturation or a process toward fullness or fulfillment. Reproduction may be defined as the production of progeny possessing features more or less similar to those of parents.

2. Answer: A. Taxon

3. Answer: B. Law of thermodynamics

4. Answer: C. They respond to external stimuli

5. Answer: B. reproduction
Explanation: Reproduction ensures the continuity of the species, generation after generation. Genetic variation is created and inherited during reproduction.

6. Answer: C. Vegetative and reproductive parts

Explanation: A family is a subdivision of an order consisting of a group of related genera which in turn are composed of groups of related species. Families are characterized on the basis of vegetative and reproductive parts of the plants species.

7. Answer: A. metabolism

Explanation: All living organisms are continuously making or breaking biomolecules, such conversions are due to chemical reactions, and sum total of all such chemical reactions, occurring in the body is called metabolism. Each metabolic pathway in the cell is tightly regulated by enzymes.

8. Answer: C. Genus

9. Answer: C. Mangifera indica

10. Answer: A. continuously, only upto a certain age
Explanation: All cells arise from pre-existing cells by a process of cell division. Cell division is the phenomenon of production of daughter cell from parent cell. It occurs continuously in plants and only up to a certain age in animals.

Practice MCQ Questions for class 11 Biology Chapter-Wise

Discussion

46.	The length of the perpendicular from the origin to the plane \(\vec {r} .(3\vec{i}+4\vec{j}+12\vec{k}) = 26\) is _______. (a) 26 (b) 26/163(c) 2 (d) 1/2
Answer» The correct answer is : (c) 2

Discussion

47.	The asymptote to the curve y2 (1 + x) = x2 (1 – x) is _______. (a) x = 1 (b) y = 1 (c) y = -1 (d) x = -1
Answer» The correct answer is : (d) x = -1

Discussion

48.	If `f(x) = { 3 + \|x-k\|, x leq k; a^2 -2 + sin(x-k)/(x-k), xgtk}` has minimum at x =k, then show that `\|a\| >2`.A. `aepsilonR`B. `\|a\|lt2`C. `\|a\|gt2`D. `1lt\|a\|lt2`
Answer» Correct Answer - C `f(k)=3` `f(k+h)=a^(2)-2+(sinh)/himplieslim_(hrarro) f(k+h)=a^(2)-1` `lim_(xrarr0) f(k-h)=lim_(hrarr0)(3+\|k-h-k\|)=lim_(hrarr0)(3+\|-h\|)=3` `impliesa^(2)-1gt3` `a^(2)gt4rarr\|a\|gt2`

Discussion

49.	Find the middle term in the expansion \(\rm \left ( 4x-\frac{x^3}{2} \right ) ^9\)1. \({}^9C_{4}\ 4^3\ x^{17}\)2. \(- {}^9C_{5}\ 2^3\ x^{19}\)3. Both 1 and 24. None of these
Answer» Correct Answer - Option 3 : Both 1 and 2 Formula Used: General Term in the expansion (x - y)n = Tr+1 = (-1)r × nCr × xn-r × yr Concept: The middle term of the expansion of (x + a)n depends upon the value of n. (i) When n is even the total number of terms in the expansion of (x + a)n is n+1(odd). So, there is only one middle term, i.e \(\rm\left ( \frac{n+1}{2} \right)\)th term is the middle term. (ii) When n is odd The total number of terms in the expansion of (x + a)n is n+1(even). So, there is two middle term, i.e., \(\rm\left ( \frac{n+1}{2} \right )\)th and \(\rm\left ( \frac{n+3}{2} \right )\)th term are two middle terms. Calculation: The number of terms in the expansion of \(\rm \left ( 4x-\frac{x^3}{2} \right ) ^9\) is 10(even). So there are two middle terms. i.e. \(\rm\left ( \frac{9+1}{2} \right )\)th and \(\rm\left ( \frac{9+3}{2} \right )\) th terms. They are given by T₅ and T₆. Tr+1 = nCrxn-rar Required term T5 = T4+1 = 9C₄(4x)⁵(-x³/2)⁴ \(\Rightarrow \rm T_{5}= {}^9C_{4}4^5x^5\left ( \frac{1}{2^4} \right )x^{12}\) \(\Rightarrow \rm T_{5}= {}^9C_{4}4^3x^{17}\) T6 = T5+1 = 9C₅(4x)4(-x3/2)5 \(\Rightarrow \rm T_{6}= -{}^9C_{5}4^4x^4\left ( \frac{1}{2^5} \right )x^{15}\) \(\Rightarrow \rm T_{6}=- {}^9C_{5}\left ( \frac{2^8}{2^5} \right )x^{19}\) \(\Rightarrow \rm T_{6}=- {}^9C_{5}\ 2^3\ x^{19}\) ∴ The 3rd option is correct option.

49.

Find the middle term in the expansion \(\rm \left ( 4x-\frac{x^3}{2} \right ) ^9\)1. \({}^9C_{4}\ 4^3\ x^{17}\)2. \(- {}^9C_{5}\ 2^3\ x^{19}\)3. Both 1 and 24. None of these

Answer» Correct Answer - Option 3 : Both 1 and 2

Formula Used:

General Term in the expansion (x - y)n = Tr+1 = (-1)r × nCr × xn-r × yr

Concept:

The middle term of the expansion of (x + a)n depends upon the value of n.

(i) When n is even the total number of terms in the expansion of (x + a)n is n+1(odd).

So, there is only one middle term, i.e \(\rm\left ( \frac{n+1}{2} \right)\)th term is the middle term.

(ii) When n is odd The total number of terms in the expansion of (x + a)n is n+1(even).

So, there is two middle term, i.e., \(\rm\left ( \frac{n+1}{2} \right )\)th and \(\rm\left ( \frac{n+3}{2} \right )\)th term are two middle terms.

Calculation:

The number of terms in the expansion of \(\rm \left ( 4x-\frac{x^3}{2} \right ) ^9\) is 10(even).

So there are two middle terms. i.e. \(\rm\left ( \frac{9+1}{2} \right )\)th and \(\rm\left ( \frac{9+3}{2} \right )\) th terms.

They are given by T₅ and T₆.

Tr+1 = nCrxn-rar

Required term

T5 = T4+1 = 9C₄(4x)⁵(-x³/2)⁴

\(\Rightarrow \rm T_{5}= {}^9C_{4}4^5x^5\left ( \frac{1}{2^4} \right )x^{12}\)

\(\Rightarrow \rm T_{5}= {}^9C_{4}4^3x^{17}\)

T6 = T5+1 = 9C₅(4x)4(-x3/2)5

\(\Rightarrow \rm T_{6}= -{}^9C_{5}4^4x^4\left ( \frac{1}{2^5} \right )x^{15}\)

\(\Rightarrow \rm T_{6}=- {}^9C_{5}\left ( \frac{2^8}{2^5} \right )x^{19}\)

\(\Rightarrow \rm T_{6}=- {}^9C_{5}\ 2^3\ x^{19}\)

∴ The 3rd option is correct option.

Discussion

50.	Rajdhani Express covers a distance of \( 540 km \) between New Delhi and Kanpur in 4 hours 30 minutes. Its speed was ......1) \( 120 km \) / hour 2; \( 142 m / sec \)3) \( i 26 km / \) hour4) \( 124 km / hol r \)
Answer» Answer : a)120km/hr Explanation : GIven, Distance covered by Rajdhani Express = 540km Time taken = 4.5hrs Speed = Distance/Time = 540/4.5 = 120km/hr

50.

Rajdhani Express covers a distance of \( 540 km \) between New Delhi and Kanpur in 4 hours 30 minutes. Its speed was ......1) \( 120 km \) / hour 2; \( 142 m / sec \)3) \( i 26 km / \) hour4) \( 124 km / hol r \)

Answer»

Answer : a)120km/hr

Explanation :

GIven, Distance covered by Rajdhani Express = 540km

Time taken = 4.5hrs

Speed = Distance/Time = 540/4.5 = 120km/hr

Discussion

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