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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. |
Which of the following is not the application of recycle system?(a) Increased reactant conversion(b) Decreased reactant conversion(c) Continuous catalyst regeneration(d) Circulation of the working fluid |
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Answer» The correct choice is (b) Decreased reactant conversion The explanation is: The most common application of recycle for systems involving chemical reaction is the recycle of reactants, an application that is used to increase the overall conversion in a reactor and not the decreased reactant conversion. |
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| 2. |
Which sort of Fermenter is used for the production of Penicillin?(a) Batch Fermenter, Fed-Batch Process(b) Fed-Batch Fermenter, Fed-Batch Process(c) Continuous Batch Fermenter , Fed-Batch Process(d) Fed-Batch Fermenter, Batch process |
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Answer» Correct option is (a) Batch Fermenter, Fed-Batch Process Easy explanation: For Large production of Penicillin a Batch Fermenter, and a Fed-Batch Process is normally used to prolong the stationary period and so as to increase the production of Penicillin and Batch is used over continuous fermenter for large scale production and fed-batch process is used to overcome its disadvantages. |
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| 3. |
An electron is at P `t = 0` It is circulating in anticlockwise direction with a constant angular speed `omega` along the shown circular path. Magnetic field at `Q(CQ = 2R`, where R is radius of the circular) will be recorded as zero at times) A. `(pi)/(3 omega)`B. `(5 pi)/(3 omega)`C. `(7 pi)/(3 omega)`D. `(8 pi)/(3 omega)` |
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Answer» Correct Answer - A::B::C Zero magnetic field will be recorded at Q when particle is at A and B such that AQ and BQ are tangent to circle. |
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| 4. |
Which chemical is usually used before the Bacterial transformation process?(a) Calcium chloride(b) Potassium chloride(c) Ferric chloride(d) Sodium chloride |
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Answer» The correct choice is (a) Calcium chloride For explanation I would say: Before Bacterial transformation, bacteria are treated with a chemical called Calcium chloride, which causes water to enter into the cells and makes them swell. These swollen bacteria are then known as competent bacteria, which is further used in Bacterial transformation process. |
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| 5. |
The diauxic growth curve mainly found in E.coli in the case of two types of nutrients is found in Batch culture is based on which equation?(a) Monod equation(b) Michaelis – Menten equation(c) Schrodinger equation(d) Lyapunov equation |
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Answer» The correct option is (a) Monod equation The explanation: Jacques Monod discovered diauxic growth in 1941 during his experiments with Escherichia coli and Bacillus subtilis. While growing these bacteria on various combinations of sugars during his doctoral thesis research, Monod observed that often two distinct growth phases are clearly visible in batch culture. |
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| 6. |
Venturi relation is one of the applications of ___________(a) Light equation(b) Bernoulli’s equation(c) Speed equation(d) Equation of continuity |
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Answer» The correct choice is (b) Bernoulli’s equation Explanation: The flow speed of a fluid can be measured using a device such as a Venturi meter or an orifice plate, which can be placed into a pipeline to reduce the diameter of the flow. For a horizontal device, the continuity equation shows that for an incompressible fluid, the reduction in diameter will cause an increase in the fluid flow speed. Subsequently, Bernoulli’s principle then shows that there must be a decrease in the pressure in the reduced diameter region. This phenomenon is known as the Venturi effect. |
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| 7. |
Find the charge in steady state of the capacitor.(1) 10 nC (2) 20 nC (3) 30 nC (4) 40 nC |
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Answer» Option not match. Explanation: Capacitor is in parallel to 100Ω resistance of volt will be V = IR [121/300]200 = 8V q = cV = 8 nC |
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| 8. |
Which of the following has max. solubility at low pH? (1) NH4Cl (2) NaCl (3) Na3PO4 (4) Sr(OH)2 |
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Answer» Correct option (4) Sr(OH)2 Explanation: max solubility at low PH means in acidic solution so Sr(OH)2 = Sr+2 + 2OH– get dissolve in high amount as OH– get neutralize by H+ |
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| 9. |
The results obtained in electrostatics using Gauss’s law can in some cases be used to obtain results in gravitation, and vice versa. This is because both follow the inverse-square law of distance. We use the following three rules: (1) For charge in electrostatics, the corresponding quantity in gravitation is mass. (2) Electric intensity of electrostatics corresponds to gravitational intensity, or acceleration due to gravity, in gravitation. (3) The constant k = (4πε0)-1 of electrostatics corresponds to -G in gravitation.The gravitational intensity at a distance r from a long thread having λ mass per unit length has the magnitude(a) λG/r (b) 2λG/r (c) λG/2r (d) λG/2πr |
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Answer» Correct Answer is: (a) λG/r |
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| 10. |
Akanksha is the Aunt (Chachi) of Saurabh. Chandresh is Saurabh's Father. What is the relation between Akanksha's husband & Chandresh ? |
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Answer» Brothers is the relation between Akanksha's husband & Chandresh. |
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| 11. |
The temperature of food material in refrigerator is 4ºC and temperature of environment is 15ºC. If carnot cycle is used in its working gas, then find its carnot efficiency. (1) 0.038 (2) 0.028 (3) 0.053 (4) 0.072 |
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Answer» Correct option (1) 0.038 Explanation: η = 1 - T2/T1 = 1 - (273 + 4)/(273 + 15) = 0.038 |
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| 12. |
Assertion : The kinetic energy does not change when a particle moves in uniform magnetic field.Reason : The velocity of the particle is not affected by magnetic field.(1) If both assertion and reason are true and reason is the correct explanation of assertion.(2) If both assertion and reason are true but reason is not the correct explanation of assertion.(3) If assertion is true but reason is false.(4) If both assertion and reason are false. |
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Answer» (1) If both assertion and reason are true and reason is the correct explanation of assertion. |
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| 13. |
How does the power of a lens vary with its focal length ? |
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Answer» Power of a lens is inversely proportional to its focal length. i.e. p = \(\frac{1}{f}\) |
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| 14. |
Assertion: Some salts are sparingly soluble at room temperature.Reason : The entropy increases on dissolving the salts.(1) If both assertion and reason are true and reason is the correct explanation of assertion.(2) If both assertion and reason are true but reason is not the correct explanation of assertion.(3) If assertion is true but reason is false.(4) If both assertion and reason are false. |
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Answer» (2) If both assertion and reason are true but reason is not the correct explanation of assertion. |
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| 15. |
Assertion : Vrms and Vmean of gaseous molecules is nearly of the order of velocity of sound.Reason : The sound travels in air because of vibrational molecular motion.(1) If both assertion and reason are true and reason is the correct explanation of assertion.(2) If both assertion and reason are true but reason is not the correct explanation of assertion.(3) If assertion is true but reason is false.(4) If both assertion and reason are false. |
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Answer» (2) If both assertion and reason are true but reason is not the correct explanation of assertion. |
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| 16. |
Assertion: In desert area, days get hot fastly and the nights get cold fastly. Reason: The specific heat capacity for air and land is less than that of water. (1) If both assertion and reason are true and reason is the correct explanation of assertion. (2) If both assertion and reason are true but reason is not the correct explanation of assertion. (3) If assertion is true but reason is false. (4) If both assertion and reason are false. |
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Answer» (1) If both assertion and reason are true and reason is the correct explanation of assertion. |
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| 17. |
Assertion : Anhydrides are more reactive than ester for nucleophilic substitutionReason : R.COO- is better leaving group than R-O-(1) If both assertion and reason are true and reason is the correct explanation of assertion.(2) If both assertion and reason are true but reason is not the correct explanation of assertion.(3) If assertion is true but reason is false.(4) If both assertion and reason are false. |
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Answer» (1) If both assertion and reason are true and reason is the correct explanation of assertion. |
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| 18. |
When a ray of light enters a glass slab, its wavelength.(a) increases (b) decreases(c) remains unchanged(d) data are not complete. |
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Answer» (b) decreases |
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| 19. |
Correct order for nucleophilic addition reaction :(1) 2 > 1 > 3 > 4 (2) 4 > 3 > 2 >1 (3) 2 > 3 > 4 > 1 (4) 4 > 2 > 3 > 1 |
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Answer» (3) 2 > 3 > 4 > 1 |
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| 20. |
The direction of propagation of electromagnetic wave is(a) parallel to vector B(b) parallel to vector E(c) Parallel to vector B x E(d) parallel to vector E x B |
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Answer» (d) parallel to vector E x B |
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| 21. |
Impedance of LR circuit is(a) R2 + ω2L2(b) √(R + ωL)(c) R + ωL(d) √(R2 +ω2 L2) |
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Answer» (d) √(R2 +ω2 L2) |
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| 22. |
Assertion : Vapour pressure of solvent increases when solvent B is added.Reason : B is more volatile therefor vapour pressure of B is greater than of A.(1) If both assertion and reason are true and reason is the correct explanation of assertion.(2) If both assertion and reason are true but reason is not the correct explanation of assertion.(3) If assertion is true but reason is false.(4) If both assertion and reason are false. |
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Answer» (1) If both assertion and reason are true and reason is the correct explanation of assertion. |
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| 23. |
Assertion: Binding energy increase with increases atomic mass number.Reason: Density of nucleus increase with increases in atomic mass number(1) If both assertion and reason are true and reason is the correct explanation of assertion.(2) If both assertion and reason are true but reason is not the correct explanation of assertion.(3) If assertion is true but reason is false.(4) If both assertion and reason are false. |
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Answer» (3) If assertion is true but reason is false. |
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| 24. |
When Ag+ reacts with excess of sodium-thio sulphate then he obtained species having charge & geometry respectively : (1) –3, Linear (2) – 2, tetrahedral (3) – 1, square planer (4) – 3, square planar |
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Answer» Correct option (1) –3, Linear Explanation: AgBr + 2Na2S2O3 → Na3 [Ag(S2O3)2] + NaBr Coordination number of Ag+ is 2 so it has sp hybridization and has linear shape. |
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| 25. |
Which of the following is incorrect about cyanogen gas? (1) It has bent structure(2) It is psuedohalogen.(3) Its behavior is similar to halides.(4) both carbon are sp hybridised |
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Answer» Correct option (1) It has bent structure Explanation: cyanogen gas (CN)2 is sp hybridised having linear geometry. N ≡ C - C ≡ N |
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| 26. |
Define magnetisation of a sample. |
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Answer» It is defined as “the net magnetic moment developed per unit volume of the material”. |
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| 27. |
Assertion : Binding energy per unit nucleon increases with increase in atomic mass number.Reason : Density of nucleus increases with increase in mass number.(1) If both assertion and reason are true and reason is the correct explanation of assertion.(2) If both assertion and reason are true but reason is not the correct explanation of assertion.(3) If assertion is true but reason is false.(4) If both assertion and reason are false. |
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Answer» (4) If both assertion and reason are false. |
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| 28. |
Assertion : U is state functionReason : T is an intensive propertive(1) If both assertion and reason are true and reason is the correct explanation of assertion.(2) If both assertion and reason are true but reason is not the correct explanation of assertion.(3) If assertion is true but reason is false.(4) If both assertion and reason are false. |
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Answer» (2) If both assertion and reason are true but reason is not the correct explanation of assertion. |
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| 29. |
If speed of sound in air in 330 m/s then find the number of tones present in an open organ pipe of length 1m whose frequency if ≤ 1000.(1) 2 (2) 4 (3) 8 (4) 6 |
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Answer» Correct option (4) 6 Explanation: fundamental frequency f = v/2l = 330/(2 x 1) = 165Hz ∴ number of overtones allowed = 1000/165 = 6. |
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| 30. |
How can the resolving power of a telescope be increased? |
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Answer» Shorten the wavelength of light is used. |
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| 31. |
Identify which of the following fruits are false fruit?(1) a, b, c, d (2) b, c, d (3) a, b, c (4) c, d |
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Answer» Correct option: (4) c, d |
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| 32. |
On Heating hydrazoic acid form (1) NH3 (2) N2 + NH3 (3) N2H4 + NH3 (4) H2 + 3N2 |
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Answer» Correct option (4) H2 + 3N2 Explanation: 2HN3 → H2 + 3N2 |
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| 33. |
Find γ for the mixture of 11 gm CO2 and 14 gm N2?(1) γmix = 7/5(2) γmix = 10/5(3) γmix = 11/8(4) γmix = 4/3 |
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Answer» Correct option (1) γmix = 7/5 |
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| 34. |
What is an electric dipole? |
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Answer» A pair of equal & opposite charges are separated by a small distance is called electric dipole. |
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| 35. |
Which of the following switch off lac operon(1) Structural gene (2) Regulator gene (3) Operator gene (4) Promoter gene |
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Answer» (2) Regulator gene |
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| 36. |
Assertion : A metallic surface is moved in and out in magnetic field then emf is induced in it.Reason : Eddy current will be produced in a metallic surface moving in and out of magnetic field.(1) If both assertion and reason are true and reason is the correct explanation of assertion.(2) If both assertion and reason are true but reason is not the correct explanation of assertion.(3) If assertion is true but reason is false.(4) If both assertion and reason are false. |
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Answer» (1) If both assertion and reason are true and reason is the correct explanation of assertion. |
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| 37. |
State Faraday’s law of electromagnetic induction. |
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Answer» 1st law: Whenever a magnetic flux linked with the coil, a change in emf is induced in it. This induced emf lasts as long as the change in magnetic flux continues. |
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| 38. |
The results obtained in electrostatics using Gauss’s law can in some cases be used to obtain results in gravitation, and vice versa. This is because both follow the inverse-square law of distance. We use the following three rules: (1) For charge in electrostatics, the corresponding quantity in gravitation is mass. (2) Electric intensity of electrostatics corresponds to gravitational intensity, or acceleration due to gravity, in gravitation.(3) The constant k = (4πε0)-1 of electrostatics corresponds to -G in gravitation.The acceleration due to gravity at the surface of the earth is g, and at a distance r from the centre of the earth is gr/R, where R is the radius of the earth. Inside a uniformly charged sphere of radius R and charge Q, the electric intensity at a distance r (r < R) from the centre has the magnitude .(a) kQ{1 - (r/R)2} (b) kQr/R3 (c) kQR/r3 (d) kQ(R - r)/R3 |
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Answer» Correct Answer is: (b) kQr/R3 |
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| 39. |
A converging glass lens with a refractive index of 1.5 has a focal length of f in air. When it is completely immersed in a liquid of refractive index 2, its focal length and nature will be respectively (a) 2f and converging (b) 3f and converging (c) 2f and diverging (d) 3f and diverging |
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Answer» Correct Answer is: (c) 2f and diverging Let k = 1/R1 - 1/R2 . ∴ 1/f = (1.5 - 1)k and 1/f' = (1.5/2 - 1) k = (- 0.5/2) 2/f = - 0.5/f. ∴ f' = -2f. |
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| 40. |
A large hollow metal sphere of radius R has a small opening at the top. Small drops of mercury each of radius r and charged to a potential V fall into the sphere. The potential of the sphere becomes V' after N drops fall into it. Then, (a) V' < V for all N (b) V' = V for N = 1 (c) V' = V for N = R/r (d) V' = V for N = (R/r)1/3 |
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Answer» Correct Answer is: (a) V' < V for all N Capacitance of each mercury drop is 4πɛ0r. Charge on each mercury drop is 4πɛ0r VN. Capacitance of the hollow sphere is 4πɛ0R. When it acquires Q charge, its potential is V' = Q/4πɛ0R. For V' = V, 4πɛ0RV = 4πɛ0rVN or N = R/r. |
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| 41. |
Electrically charged drops of mercury fall from an altitude h into a spherical metal vessel of radius R. There is a small opening in the upper part of the vessel. The mass of each drop is m, and the charge on the drop is Q. What will be the number n of the last drop that can still enter the sphere? |
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Answer» Correct Answer - `n=(4pi in_(0) mg(h-R)R)/Q^(2)` Let `n^(th)` number last drop that can entre `(KQ^(2))/Rxxn=mg (h-R) :. N=(4pi in_(0) mg(h-R)R)/Q^(2)` |
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| 42. |
In the circuit as shown, it is given that `R_1//R_2 = 1//2` and potential at O is V. A. `80 Omega`B. `16 Omega`C. `240 Omega`D. any value |
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Answer» Correct Answer - D d. Given, `R_2 = 2R_1` For `AO , 100 -V = i_1R_1` For `BO, 100- V = i_2(2R_2)` For `OD, V-0 = i_3 (20)` For `OC , V - 50 = (i_1 + i_2/2 - i_3)(50)` `VR_1 = 50R_1 = ((3i_1)/2 xx 50 -i_3 xx 50) R_1` From Eqs. (i) and (iii), `VR_(1) = 50R_(1) = 75(100-V) -2.5 VR_(1)` `3.5 VR_1 - 50R_1` = 7500 - 75V` ,brgt If `Vlt75V,` then `RHSgt0`. So, `LHS gt0` `3.5 V gt 50` ("since" R_1!=0)` `Vgt50/3.5` From Eq. (v), `V=20 V`. `70 R_1 - 50R_1 = 7500 - 1500 = 6000` `R_1 = 300 Omega` `R_2 = 2R_1 = 600Omega` From Eq. (v), `3.5 VR_1 + 75V = 7500 + 50 R_1` For any value of `R_1` Vgt0. |
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| 43. |
In the circuit as shown, it is given that `R_1//R_2 = 1//2` and potential at O is V. A. `150 Omega`B. `300 Omega`C. `450 Omega`D. `600 Omega` |
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Answer» Correct Answer - D d. Given, `R_2 = 2R_1` For `AO , 100 -V = i_1R_1` For `BO, 100- V = i_2(2R_2)` For `OD, V-0 = i_3 (20)` For `OC , V - 50 = (i_1 + i_2/2 - i_3)(50)` `VR_1 = 50R_1 = ((3i_1)/2 xx 50 -i_3 xx 50) R_1` From Eqs. (i) and (iii), `VR_(1) = 50R_(1) = 75(100-V) -2.5 VR_(1)` `3.5 VR_1 - 50R_1 = 7500 - 75V` ,brgt If `Vlt75V,` then `RHSgt0`. So, `LHS gt0` `3.5 V gt 50 ("since" R_1!=0) ` `Vgt50/3.5` From Eq. (v), `V=20 V`. `70 R_1 - 50R_1 = 7500 - 1500 = 6000` `R_1 = 300 Omega` `R_2 = 2R_1 = 600Omega` From Eq. (v), `3.5 VR_1 + 75V = 7500 + 50 R_1` For any value of `R_1 Vgt0`. |
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| 44. |
The value of resistance of an unknown resistor is calculated using the formula `R = V//I ` where V and I are the readings of the voltmeter and the ammeter, respectivley. Consider the circuits below. The internal resistances of the voltmeter and the ammeter `(R_V and R_G, respectively)` are finite and nonzero. , Let `R_(A) and R_(B)` be the calculated values in the two cases A and B , respectively. If the resistance of voltmeter is `R_(V) = 1k Omega` and the percentage error in the measurement of R (the value of R is nearly `10 Omega`)isA. zero in both casesB. nonzero but equal in both casesC. more in circuit AD. more in circuit B |
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Answer» Correct Answer - D d. `R_(A) = R_(A) = (R xx R_V)/(R+R_V) ltR` `R_(B) = R+R_0 gtR` (Tough) % error in case A. `(R_(A)-R)/R xx 100 = (R_(V)/(R+R_(V)) -1) xx 100 ` `R/(R+R_(V)) xx 100 = - 1%` Percentage error in case B `(R_(B) - R)/R xx 100 = R_(G)/R xx 100 = 10%` Hence, percentage error in circuit B is more than that in A. |
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| 45. |
The value of resistance of an unknown resistor is calculated using the formula `R = V//I ` where V and I are the readings of the voltmeter and the ammeter, respectivley. Consider the circuits below. The internal resistances of the voltmeter and the ammeter `(R_V and R_G, respectively)` are finite and nonzero. , Let `R_(A) and R_(B)` be the calculated values in the two cases A and B , respectively. The relation between `R_A` and the actual value of R isA. `RgtR_(A)`B. `RltR_(A)`C. `R=R_(B)`D. dependent upon E and r. |
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Answer» Correct Answer - A a. `R_(A) = R_(A) = (R xx R_V)/(R+R_V) ltR` `R_(B) = R+R_0 gtR` (Tough) % error in case A. `(R_(A)-R)/R xx 100 = (R_(V)/(R+R_(V)) -1) xx 100 ` `R/(R+R_(V)) xx 100 - 1%` Percentage error in case B `(R_(B) - R)/R xx 100 = R_(G)/R xx 100 = 10%` Hence, percentage error in circuit B is more than that in A. |
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| 46. |
The value of resistance of an unknown resistor is calculated using the formula `R = V//I ` where V and I are the readings of the voltmeter and the ammeter, respectivley. Consider the circuits below. The internal resistances of the voltmeter and the ammeter `(R_V and R_G, respectively)` are finite and nonzero. , Let `R_(A) and R_(B)` be the calculated values in the two cases A and B , respectively. The relation between `R_A` and the actual value of R isA. `RltR_(B)`B. `RgtR_(B)`C. `R = R_(B)`D. dependent upon E and r. |
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Answer» Correct Answer - A a. `R_(A) = R_(A) = (R xx R_V)/(R+R_V)` lt`R` `R_(B) = R+R_0 gtR` (Tough) % error in case A. `(R_(A)-R)/R xx 100 = (R_(V)/(R+R_(V)) -1) xx 100 ` `R/(R+R_(V)) xx 100 - 1%` Percentage error in case B `(R_(B) - R)/R xx 100 = R_(G)/R xx 100 = 10%` Hence, percentage error in circuit B is more than that in A. |
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| 47. |
A uniform cube of mass `M` is floating on the surface of a liquid with three fourth of its volume immersed in the liquid (density of liquid is `rho`). Now a cubical cavity is made inside the cube and the cavity is filled by a material having twice the density of the original cube. The minimum dimension (sides) of this cavity such that this cube is now completely immersed in the liquid is `[(4M)/(nrho)]^(1/3)`. Find the value of `n` |
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Answer» Correct Answer - 9 Side of cube `=a` `Mg=3/4a^(3)rhog` If side of cavity is `b`. New mass of cube `=(a^(3)-b^(3))3/4rho+b^(3)6/4rho=(a^(3)+b^(2))3/4rho` `a^(3)rhog=(a^(3)+b^(3))3/4rhog` `b^(3)=(a^(3))/3,b=[1/3]^(1/3)a` `b=[4/9M/(rho)]^(1/3)` |
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| 48. |
why is wind speed a function of the coriolis effect, pressure gradient force and frictional force |
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Answer» pressure gradient force (PGF), the Coriolis Force and friction force |
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| 49. |
what is heredity |
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Answer» Heredity, the sum of all biological processes by which particular characteristics are transmitted from parents to their offspring. |
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| 50. |
विश्व के वनो के प्रकार तथा उसके वितरण का वर्णन कीजिये। |
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Answer» वनों का वर्गीकरण प्रशासनिक आधार पर
भारतीय संविधान के अनुसार वर्गीकरण
व्यावसायिकता के आधार पर
बनावट के आधार पर
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