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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Goitre is a pathological condition associated with |
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Answer» Answer: 'Thyroxine' The iodine deficient diet renders thyroid gland unable to synthesise the hormones. Under these conditions, constant stimulation of thyroid gland by the anterior pituitary to secrete hormones leads to enlargement of thyroid gland, the simple goitre or endemic goitre. Glucagon regulates blood sugar level while progesterone and testosterone are female and male reproductive hormones respectively. GOITRE is a pathological condition associated with lack of thyroxine hormone, how much this hormone is less that much human is prone to this disease. Hence, answer is lack of thyroxine hormone. |
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| 2. |
Source of Vitamin 'D' is –(a) Sun rays (b) cereal(c) vegetable (d) fruit |
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Answer» Source of Vitamin 'D' is Sun rays. |
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| 3. |
Directions: Below question is followed by two statements I and II. You have to determine whether the data given in the statements are sufficient for answering the question. You should use the data and your knowledge of Mathematics to choose the best possible answer.Find the number of days C will take to finish the work alone.Statement I: A and B working alone can finish a piece of work in 6 days and 15 days respectively. With the help of C, they finish the work in 4 days. Statement II: A and B together finish the work in 30/7 days1. If the data in statement I alone is sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question.2. If the data in statement II alone is sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question.3. If the data either in statement I alone or in statement II alone is sufficient to answer the question.4. If the data even in both the statements I and II together are not sufficient to answer the question.5. If the data in both statements I and II together are needed to answer the question. |
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Answer» Correct Answer - Option 1 : If the data in statement I alone is sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question. Given: Statement I: A can finish a piece of work in = 6 days B can finish a piece of work in = 15 days A, B and C together finish the work in = 4 days Statement II: A and B together finishes the work in = 30/7 days Calculations: Statement I: Let C’s 1 day work be 1/C A’s 1 day work = 1/6 B’s 1 day work = 1/15 (A + B + C)’s 1 day work = 1/4 ⇒ (1/6) + (1/15) + (1/C) = (1/4) ⇒ (10/60) + (4/60) + (1/C) = (15/60) ⇒ (14/60) + (1/C) = (15/60) ⇒ (1/C) = [(15 – 14)/60] ⇒ (1/C) = (1/60) ⇒ C = 60 days ∴ If the data in statement I alone is sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question. |
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| 4. |
Differentiate test cross and out cross. |
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Answer» Test cross It is a cross between F1 hybrid and homozygous recessive parent. Out cross It is a cross between F1 hybrid and homozygous dominant parent. |
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| 5. |
Saponification reaction with examples |
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Answer» Esters react in the presence of an acid or a base to give back alcohol and carboxylic acid. This reaction is used in the manufacture of soaps and is known as saponification. Soap is nothing but the sodium salt of the carboxylate. CH3COOC2H5 ---(NaOH)--> CH3COOH + C2H5OH
CH3COONa is the soap. |
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| 6. |
Give two examples for natural selection in organisms. |
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Answer» 1. Industrial melanism in Biston betularia 2. Antibiotic resistance in bacteria |
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| 7. |
What are single cell proteins? Mention their importance? |
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Answer» Dried biomass of a single species of microbes that can be used as protein source in the diet is known a single cell protein (SCP). Single cell proteins (SCP) are alternative source of proteins used to feed the ever increasing population with protein rich diet to overcome the problems of protein malnutrition. |
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| 8. |
Why is India said to have greater ecosystem diversity than Norway? |
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Answer» India with diverse ecosystems such as rain forests, coral reefs, wet lands, coastal areas, mangroves, estuaries and deserts has greater ecosystem diversity than Norway. |
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| 9. |
Name the alloy which is mainly used for making permanent magnets. |
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Answer» The allow 'Alnico' is used for making permanent magnets. It is an alloy of aluminium, nickel, cobalt and iron. |
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| 10. |
The radius of gyration of a solid shapere of radius r about a certain axis is r. The distance of this axis from the centre of the shpere isA. rB. 0.5rC. `sqrt(0.6) r `D. `sqrt(0.4)r` |
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Answer» Correct Answer - 3 `2/5 mr^(2)+mx^(2)=mr^(2)` `rArr x=sqrt(0.6)r` |
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| 11. |
A massless rope is wrapped several times on a disc of mass M and radius R. The other end is tied to a mass m which at the beginning is at a height of h above ground as shown in the figure. When released the velocity of the mass as it touches the ground is A. `sqrt((4mgh)/(2m+M))`B. `sqrt(2gh)`C. `sqrt((4mgh)/(3M))`D. `sqrt((4mgh)/(M+m))` |
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Answer» Correct Answer - 1 `tau=Ialpha" " rArr TR=1/2 MR^(2)(a/R)` `rArr T=1/2 Ma` and `mg-T=ma` `mg =ma+1/2 Ma `or `a=(2mg)/(M+2m)` Velocity after a fall of height h is `v^(2)=2ah` `v=sqrt(2ah)=sqrt((4mgh)/(M+2m))` |
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| 12. |
A solid sphere and a solid cylinder having the same mass and radius, rolls down the same incline. The ratio of their acceleration will beA. 0.59375B. `1:2`C. `15:14`D. `2:1` |
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Answer» Correct Answer - 3 `a_(s)=(g sin theta)/(1+I/(mR^(2)))=(g sin theta)/7` `a_(c)=2/3 g sin theta` |
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| 13. |
A skier starts from rest at point A and slides donw the hill without turning or breaking. The friction coefficient is `mu` When he stops at point B, his horizontal displacement is S. whalt is the height difference between points A and B? (The velocity of the skier is small so that the additional pressure on the snow due to the curvature can vbe neglected. Neglect also the friction of air and the dependence of `mu` on the velocity of the skier)A. `h=muS`B. `h=(mu)/(S)`C. `h=2muS`D. `h=muS^(2)` |
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Answer» Correct Answer - A |
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| 14. |
Two atoms interact with each other according to the following force `F` and potential energy `V` diagrams. What is their equilibrium separation? A. the seperation u which is equal to yB. the seperation u which is equal to zC. the separation w which is equal to yD. the separation w which is equal to z |
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Answer» Correct Answer - B For equilibrium `F=0and from F-x graph it is clear at x=4 f=0 from V-x graph` it is clear that F`= (dv)/dx = 0at x=z` |
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| 15. |
What is potential difference (P.D)? |
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Answer» The difference of potential between two points in a circuit is the voltage required to drive the current between them or the voltage drop between those two points is called the potential difference. P.D = R * I volts. |
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| 16. |
In the given circuit, with steady current, the potential drop across the capacitor must be A. VB. `(V)/(2)`C. `(V)/(3)`D. `(2V)/(3)` |
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Answer» Correct Answer - C |
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| 17. |
The intensity of X-rays from a Coolidge tube is plotted against the wavelength (λ), as shown in the figure. The minimum wavelength found is λC and the wavelength of the Kα line is λK. As the accelerating voltage is increased,(a) λK - λC increases (b) λK - λC decreases (c) λK increases (d) λK decreases |
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Answer» Correct Answer is: (a) λK - λC increases λK does not depend on the accelerating voltage. λC decreases with increase in accelerating voltage. Thus, as the accelerating voltage is increased, the difference λK - λC will increase. |
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| 18. |
The value of `K_(p)` for the reaction `NH_(2)COONH_(4)(s) hArr2NH_(3)(g)+CO_(2)(g)" is "2.9xx10^(-5)"atm"^(3).` The total pressure of gases at equilibrium when `NH_(2)COONH_(4)(s)` is taken to start the reaction at the initial concentration of 1.0 mole isA. 0.0620 atm.B. 0.0310 atm.C. 0.0582 atm.D. 0.2610 atm. |
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Answer» Correct Answer - C `"The reaction is",NH_(2)COONH_(4)(s)hArr2NH_(3)(g)+CO_(2)(g)` `{:("Initial conc.",1.0"mole",,0,,0),("Eqm. conc.",0,,2,,1):}` Let P be the equilibrium pressure then the partial pressure of ammonia `=(2)/(3)P` and the of carbon dioxide is `(1)/(3)P`. Or`" "K_(p)=[(2P)/(3)]^(2)[(P)/(3)]=(4P^(3))/(27)` Or `" "2.9xx10^(-5)=(4P^(3))/(27)" or "4P^(3)=27xx2.9xx10^(-5)` Or `" "P=root(3)((27xx2.9xx10^(-5))/(4))` Or `" "P=0.0582" atm. "` |
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| 19. |
For the decomposition reaction `NH_(2)COONH_(4)(s) hArr2NH_(3)(g)+CO_(2)(g)`, the `K_(p)=3.2xx10^(-5)atm^(3)`. The total pressure of gases at equilibrium when `1.0` mol of `NH_(2)COONH_(4)(s)` was taken to start with will be:A. `0.25atm`B. `0.12atm`C. `0.04atm`D. `0.06atm` |
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Answer» Correct Answer - D We have `NH_(2)COONH_(4)(S)hArr2NH_(3)(g)+CO_(2)(g)hArr2NH_(3)(g)+CO_(2)(g)` `K_(p)+(2p)^(2)p=4p^(3)=3.2xx10^(-5)atm^(3)` This gives `p=2xx10^(-2)atm` `p_(total)=2p+p=3p=6xx10^(-2)atm` |
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| 20. |
The values of Vander waals constant a for the gases `N_(2),CO_(2)` and `CH_(4)` are `1.390, 3.640` and `2.2253L^(2)` atm `mol^(-2)` respectively. The gas which can be most easily be liquified is,A. `CH_(4)`B. `N_(2)`C. `CO_(2)`D. Nothing can be predicted |
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Answer» Correct Answer - C Larger the vavlue of Vander Waals constant `a` more easily the gas will be liquefiable. |
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| 21. |
Ina moving coil galvanometer, a coil of area `pi cm^(2)` and `10` windings is used. Magnetic field strength applied on the coil is `1` tesla and torsional stiffness of the torsional spring `6xx10^(-5)N.M//"rad"`. A needle is welded with the coil. Due to limited space, the coil (or needle) can rotate only by `90^(@)`. For marking. the `90^(@)` space is equaly |
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Answer» `(NBA)i=ctheta` `i=(Ctheta)/(NBA)=((6xx10^(-5)))/(10xx1xxpixx10^(-4))((pi)/(2))sss` So current corresponding `1` part `=(30)/(10)=3mA`. |
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| 22. |
Define magnetic flux and write SI unit of magnetic flux ? |
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Answer» Magnetic flux—It is defined as the number of magnetic field lines passing through a surface. It is denoted by ϕ. The S.I. unit of magnetic flux is weber (wb). |
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| 23. |
Define critical angle. State two conditions of total internal reflection of light ? |
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Answer» Critical angle— The angle of incidence corresponding to which angle of refraction becomes 90º is called critical angle. Following are the two conditions of total internal reflection of light— 1. The light should travel from denser to rarer medium. 2. The angle of incidence must be greater than the critical angle for the given pair of media. |
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| 24. |
Two waves are passing through a region in the same direction at the same time . If the equation of these waves are `y_(1) = a sin ( 2pi)/(lambda)( v t - x)` and `y_(2) = b sin ( 2pi)/( lambda) [( vt - x) + x_(0) ]` then the amplitude of the resulting wave for `x_(0) = (lambda//2)` isA. `|a-b|`B. `a+b`C. `sqrt(a^2+b^2)`D. `sqrt(a^2+b^2+2ab cosx)` |
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Answer» Correct Answer - A Let `phi_1` and `phi_2` represent angles of the first and second waves , then `phi_2=(2pi)/(lambda)[(vt-x)+x_0]` and `phi_1=(2pi)/(lambda)(vt-x)` But `x_0=(lambda)/(2)` `therefore phi_2-phi_1=pi` Hence, phase difference, `phi =pi `: So, amplitude of the resultant wave `R=sqrt(a^2+b^2+2abcosphiz)` `=sqrt(a^2+b^2+2abcospi)` `=sqrt((a-b)^2)` `=a-b` or `R=|a-b|` |
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| 25. |
Name the energy losses in a transformer? |
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Answer» Energy losses in a transformer are as follows— 1. Copper losses, 2. Flux bakage losses, 3. Eddy currents losses, 4. Hysteresis losses, 5. Losses due to vibration of core. |
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| 26. |
Where should a person stand straight from the pole of a convex mirror of focal length 2.0 m on its axis, so that the image formed become half of his original height?A. `-2.60m`B. `-4.0m`C. `-5.0m`D. `-2.0` |
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Answer» Correct Answer - D Magnification of mirror `m=(f)/((f-u))(1)/(2)=(200)/((200-u))` `200-u-400` `u=-200cm` `=-2m` |
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| 27. |
In gamma emission, the change in nucleon number isA. zeroB. definiteC. increase by 1D. decreases by 1 |
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Answer» The Correct option is A. zero |
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| 28. |
When two capillary tubes of different diameters are dipped vertically, the rise of the liquid isA. zero in both the tubes.B. same in both the tubes.C. more in the tube of larger diameter.D. more in the tube of smaller diameter. |
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Answer» Correct Answer - D The rise of water in a capillary tube is expressed as,`h=(2Tcostheta)/(rdg)` where, h = height of the capillary rise, T = surface tension, r = radius of the capillary tube, g = gravitational acceleration and d = density of the liquid Here, T, d and, g remain constant. So, `hprop1/r` The rise of water is more in the tube of smaller radius. |
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| 29. |
A pendulum clock, made of a material having coefficient of linear expansion `alpha=9xx10^(-7)//.^(@)C` has a period of 0.500 sec at `20^(@)C`. If the clock is used in a climate where temperature averages `30^(@)C`, what correction is necessary at the end of 30 days to the time given by clock?A. `2.5xx10^(-7)` sB. `5xx10^(-7)s`C. `1.125xx10^(-6)s`D. `2.25xx10^(-6)` s |
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Answer» Correct Answer - D Given, the coefficient of linear expansion, `alpha=9xx10^(-7)""^(@)C^(-1)` Initial time period, `T_(0)=0.5 s`, initial temperature `T_(i) = 20°` C and final temperature, `T_(f) = 30°C` Expansion in length, `Deltal = l alpha (T_(f) - T_(i))` `!Deltal=lxx9xx10^(-7)(30-20)` Now, the time period of pendulum, `T=2pisqrt(l/g)` Error in time period, `(Deltat)/(T)=1/2(Deltal)/l+1/2(Deltag)/g` Since, `Deltag=0` `!(DeltaT)/T=1/2(Deltal)/l` Now, substituting values in the above equation we get, `!(Delta_(T))/(0.5)=1/2[(lxx9xx10^(-7))/l(30-20)]` `!DeltaT=(0.5xx9xx10^(-7)xx10)/2` `!DeltaT=2.25xx10^(-6)s` |
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| 30. |
For a transistor, the current ratio `beta_(dc)` is defined as the ratio ofA. collector current to emitter current.B. collector current to base current.C. base current to collector current.D. emitter current to collector current. |
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Answer» Correct Answer - B The current amplification factor of a transistor for direct current (DC) is the ratio of collector current (`l_(c)`) to the base current (`l_(B)` ) in common emitter configuration i.e., `B_(DC)=(I_(C))/(I_(B))` However, the ratio of collector current to the emitter current gives the value of current amplification factor in common base configuration, i.e., `alpha_(DC)=(I_(C))/(I_(E))` |
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| 31. |
The dimensions of torque are same as that ofA. moment of forceB. pressure.C. accelerationD. impulse |
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Answer» Correct Answer - A Torque is expressed as, `tau`=force ( F) `xx` perpendicular distance (r ) So, `[tau]=[F]xx[r]=[MLT^(-2)][L]` `=[ML^(2)T^(-2)]` Now, the dimension of moment of force = force `xx` distance = `[MLT^(-2)]xx[L^(1)] =[ML^(2)T^(-2)]` (b) Dimension of pressure=Force`xx["Area"}^(-2)` (c) Dimension of acceleration = `[M^(0)L^(1)T^(-2)]` (d) Dimension of impulse= [Force] `xx` [time] `=[MLT^(-2)][T^(1)]=MLT^(-1)` As, the torque has dimension `[ML^(2)T^(-2)]` which is correctly matched by the dimensions of moment of force. So, option (a) is correct. |
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| 32. |
If `sqrt(A^(2)+B^(2))` represents the magnitude of resultant of two vectors (A+ B) and (A - B),then the angle between two vectors isA. `cos^(-1)[-(2(A^(2)-B^(2)))/((A^(2)+B^(2)))]`B. `cos^(-1)[-(2(A^(2)-B^(2))/(A^(2)B^(2))]`C. `cos^(-1)[-((A^(2)-B^(2)))/2((A^(2)-B^(2)))]`D. `cos^(-1)[-((A^(2)-B^(2)))/(A^(2)+B^(2))]` |
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Answer» Correct Answer - C As we know that the magnitude of the resultant of two vectors X and Y, `R^(2)=X^(2)+Y^(2)+2XYcostheta` …(i) where,`theta` is the angle between X and Y. Putting, X=(A+B) Y=(A-B) and `R=sqrt(A^(2)+B^(2))` in Eq. (i), we get `A^(2)+B^(2)=(A+B)^(2)+(A-B)^(2)+2(A+B)(A-B)costheta` `!A^(2)+B^(2)=A^(2)+B^(2)+2AB+A^(2)+B^(2)-2AB+2(A^(2)-B^(2))costheta` `!(-(A^(2)+B^(2)))/(2(A^(2)-B^(2)))=costheta` we get, `theta=cos^(-1)[-((A^(2)+B^(2)))/(2(A^(2)-B^(2)))]` |
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| 33. |
Resolving power of a telescope will be more, fi the diameter (a) of the objective isA. independent of the diameter of the objectiveB. lowC. zeroD. high |
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Answer» Correct Answer - D Resolving power of a telescope is given, `x=a/(1.22lamda)!xpropa` where, a = diameter/aperture of objective a telescope and `lamda`= wavelength of light. when the aperture (diameter) of objective is large, then its resolving power is high. |
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| 34. |
Image formed by a concave spherical mirror is:(a) Virtual(b) Real(c) Magnified(d) Inverted |
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Answer» can be all of these depending upon position of object Correct answer is (c) Magnified |
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| 35. |
In photoelectric effect the maximum kinetic energy of emitted electron depends on:(a) wavelength(b) frequency(c) intensity(d) Work function |
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Answer» Correct answer is (a, b) |
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| 36. |
There are two columns. Column-I and Column-II. You have to match the correct options of Column-I to Column-IIColumn -IColumn-II(i) Ohm's law(a) Potential difference x current(ii) Kirchhoff's law(b) Potential difference x current x time(iii) Force x Velocity(c) Potential difference/current = constant(iv) Kilowatt-hour (kW(d) Conservation of energy |
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Answer» (i) (c) (ii) (d) (iii) (a) (iv) (b) |
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| 37. |
Define modulation. Write its types. |
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Answer» Modulation—The process of mounting a very low frequency signal over high frequency signal is known as modulation. Following are the different types of modulation which are as follows— 1. Amplitude Modulation, 2. Frequency Modulation, 3. Phase Modulation, |
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| 38. |
Write any two N-type and P-type semiconductors. |
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Answer» Following are the difference between n-type and p-type semiconductor— n-type semiconductors 1. When pentavalent impurity atoms like As, sb etc. are added in the instrinsic semiconductor, we get n-type semiconductor. 2. The majority carriers in the n-type semi-conductor are electrons and minority carriers are holes. 3. ne >> nh p-type semiconductors 1. When trivalent impurity atoms like gallium, indium etc. are added in the intrisic semi conductor, we get p-type semiconductors. 2. The majority carriers in p-type semiconductor are holes and minority carriers are electrons. 3. mh >> ne |
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| 39. |
When a ray passes through a prism, refraction takes place as shown in figure:Here A is the angle of PrismNO is perpendicular on point X.N1O is perpendicular on point Y.Angle of emergence is(a) < i1(b) < i2(c) < r1(d) < r2 |
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Answer» what is the question Correct answer is (a) <1 |
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| 40. |
Write any two properties of X-rays. |
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Answer» Two properties of X-rays are as follows— (1) They are not deflected by electric or magnetic field. (2) They travel with the speed of light as electromagnetic wave. |
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| 41. |
When a ray passes through a prism, refraction takes place as shown in figure:Here A is the angle of PrismNO is perpendicular on point X.N1O is perpendicular on point Y.(i) Angle α is-(a) (180° - 4)(b) (r1 + r2)(c) A/2(d) (i1 +i2)(ii) When a ray passes symmetrically through-a prism it suffers minimum deviation.Here ∠r is-(a) <A(b) 2A(c) A/2(d) α |
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Answer» Correct answer is (i) (a) (180° - 4) (ii) (c) A/2 |
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| 42. |
Define electric field intensity in current carrying conductor and equipotential surface. |
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Answer» Intensity of electric field- The force of any point in the electric field is connect to put on a than point on single positive charge its unit is NC-1. Equipotential surface- It is defined as the surface at which electric poteintial is same electric potential. |
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| 43. |
Write two properties of electric field lines ? |
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Answer» Following are the two properties of electric field lines— (1) Two electric field lines do not cross each other, (2) The electric field lines begin from positive charge and terminated on negative charge. |
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| 44. |
The co-enzyme containing an automatic hetero ring in the structure is |
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Answer» Answer: Sugar Phosphate |
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| 45. |
How many oxygen atoms are required for respiratory electron transport, for the oxidation of one molecule of 3 phosphoglyceric acid |
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Answer» Answer is : 14 |
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| 46. |
Positively charged particle is released from rest in a uniform electric field. The electric potential energy of the charge |
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Answer» Answer: decreases because the charge moves along the electric field. When a positively charged particle is released from rest in a uniform field, it moves along the electric field, i.e., from higher potential to lower potential. That is electric potential energy of the charge decreases. |
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| 47. |
आदमी की भाववाचक संज्ञा है(क) आदमीता(ख) आदमियत(ग) आदमीयता(घ) आदमीयत। |
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Answer» सही विकल्प है (ख) आदमियत |
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| 48. |
युवक की भाववाचक संज्ञा है(क) युवकता(ख) यौवकता(ग) यौवन(घ) युवना। |
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Answer» सही विकल्प है (ग) यौवन |
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| 49. |
घर का विशेषण है(क) घरेलू(ख) घरीय(ग) घरीला(घ) घरेस्वी। |
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Answer» सही विकल्प है (क) घरेलू |
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| 50. |
इतिहास का विशेषण है(क) इतिहासीय(ख) ऐतिहासिक(ग) इतिहासिक(घ) ऐतिहासु। |
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Answer» सही विकल्प है (ख) ऐतिहासिक |
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