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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. |
PSLV launches a rocket which is ejecting gas with a speed of 100 m/s w.r.t the rocket and the rate of ejection of gas from the rocket is 400 kg/s. If the mass of the rocket is 2000 kg, calculate the initial acceleration of the rocket. [Take g=10 m/s2] |
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Answer» PSLV launches a rocket which is ejecting gas with a speed of 100 m/s w.r.t the rocket and the rate of ejection of gas from the rocket is 400 kg/s. If the mass of the rocket is 2000 kg, calculate the initial acceleration of the rocket. [Take g=10 m/s2] |
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| 2. |
Find the time period of small oscillations of the following systems.(p) A metre stick suspended through the 20 cm mark.(q) A ring of mass m and radius r suspended through a point on its periphery. (i)2π√2√2a3g (ii) 1.51 sec (iii) 2π√3r3g (iv)T=2π√2Rg |
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Answer» Find the time period of small oscillations of the following systems. (p) A metre stick suspended through the 20 cm mark. (q) A ring of mass m and radius r suspended through a point on its periphery. (i)2π√2√2a3g (ii) 1.51 sec (iii) 2π√3r3g (iv)T=2π√2Rg |
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| 3. |
A person travels along a straight road for the first half time with a velocity v1 and the second half time with a velocity v2. Then, the mean or average velocity ¯v is given by |
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Answer» A person travels along a straight road for the first half time with a velocity v1 and the second half time with a velocity v2. Then, the mean or average velocity ¯v is given by |
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| 4. |
A PHOTON AND AN ELECTRON BOTH HAVE WAVELENGTH 1A THR RATIO OF ENERGY OF PHOTON TO THAT OF ELECTRON |
| Answer» A PHOTON AND AN ELECTRON BOTH HAVE WAVELENGTH 1A THR RATIO OF ENERGY OF PHOTON TO THAT OF ELECTRON | |
| 5. |
A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 43 and the fish is 14 cm below the surface, the area of this circle in cm2 is |
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Answer» A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 43 and the fish is 14 cm below the surface, the area of this circle in cm2 is |
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| 6. |
Two charges of +25*10^-9 coulomb and -25*10^-9 coulomb are placed 6m apart.Find the electric field intensity ratio at points 4m from the centre of the electric dipole (i) on axial line (ii) on equatorial line |
| Answer» Two charges of +25*10^-9 coulomb and -25*10^-9 coulomb are placed 6m apart.Find the electric field intensity ratio at points 4m from the centre of the electric dipole (i) on axial line (ii) on equatorial line | |
| 7. |
32.Three dielectrics of relative permitivities of Er1=1, Er2=2, Er=3 are introduced in a parallel plate capacitor of area A and separation d. Find effective capacitance between A and B |
| Answer» 32.Three dielectrics of relative permitivities of Er1=1, Er2=2, Er=3 are introduced in a parallel plate capacitor of area A and separation d. Find effective capacitance between A and B | |
| 8. |
What does "magnetic field is linear in its source *I.dl*" mean?What does 'in' refers to as in the statement? |
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Answer» What does "magnetic field is linear in its source *I.dl*" mean? What does 'in' refers to as in the statement? |
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| 9. |
How will you write the vector joining points P(1, 3,2) and Q(4, 2, 1)? Also write the unit vector for →PQ |
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Answer» How will you write the vector joining points P(1, 3,2) and Q(4, 2, 1)? Also write the unit vector for →PQ |
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| 10. |
White light is incident normally on a glass plate of thickness 0.50×10−6 m and index of refraction 1.50 . Which wavelengths in the visible region 400 nm−700 nm are strongly reflected by the plate? |
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Answer» White light is incident normally on a glass plate of thickness 0.50×10−6 m and index of refraction 1.50 . Which wavelengths in the visible region 400 nm−700 nm are strongly reflected by the plate? |
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| 11. |
A boy standing in a trolley car projects a stoneperpendicular to the trolley car with a speed v. Ifthe trolley car moves with a constant velocity u,the time of flight of the stone is |
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Answer» A boy standing in a trolley car projects a stone perpendicular to the trolley car with a speed v. If the trolley car moves with a constant velocity u, the time of flight of the stone is |
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| 12. |
Three charges +Q1, +Q2 and q are placed on a straight line such that q is somewhere in between +Q1 and +Q2. If this system of charges is in equilibrium, what should be the magnitude and sign of charge q ? |
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Answer» Three charges +Q1, +Q2 and q are placed on a straight line such that q is somewhere in between +Q1 and +Q2. If this system of charges is in equilibrium, what should be the magnitude and sign of charge q ? |
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| 13. |
Quantum numbers for outermost electron in Copper and Chromium. |
| Answer» Quantum numbers for outermost electron in Copper and Chromium. | |
| 14. |
What is the equivalent resistance between the points A and B of the circuit shown in figure. |
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Answer» What is the equivalent resistance between the points A and B of the circuit shown in figure. |
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| 15. |
The wavelength of a probe is roughly a measure of the size of a structure that it can probe in some detail. The quark structure of protons and neutrons appears at the minute length-scale of 10–15 m or less. This structure was first probed in early 1970’s using high energy electron beams produced by a linear accelerator at Stanford, USA. Guess what might have been the order of energy of these electron beams. (Rest mass energy of electron = 0.511 MeV.) |
| Answer» The wavelength of a probe is roughly a measure of the size of a structure that it can probe in some detail. The quark structure of protons and neutrons appears at the minute length-scale of 10–15 m or less. This structure was first probed in early 1970’s using high energy electron beams produced by a linear accelerator at Stanford, USA. Guess what might have been the order of energy of these electron beams. (Rest mass energy of electron = 0.511 MeV.) | |
| 16. |
Does the strength of magnetic field of a straight current carrying conductor depend on its dimensions like length or area of cross section or thickness ? |
| Answer» Does the strength of magnetic field of a straight current carrying conductor depend on its dimensions like length or area of cross section or thickness ? | |
| 17. |
The image of an object placed in air formed by convex refracting surface is at a distance of 10 m behind the surface. The image is real and is at 23rd of the distance of the object from the surface. The wavelength of light inside the surface is 32 times the wavelength in air, The radius of the curved surface is x13 m. The value of x is . |
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Answer» The image of an object placed in air formed by convex refracting surface is at a distance of 10 m behind the surface. The image is real and is at 23rd of the distance of the object from the surface. The wavelength of light inside the surface is 32 times the wavelength in air, The radius of the curved surface is x13 m. The value of x is |
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| 18. |
A ball of radius r and density r falls freely under gravity through a distance h before entering water. Velocity of ball does not change even on entering water. If viscosity of water is h, the value of h is given by |
Answer» A ball of radius r and density r falls freely under gravity through a distance h before entering water. Velocity of ball does not change even on entering water. If viscosity of water is h, the value of h is given by |
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| 19. |
In the figure shown, the relative velocity of link 1 with respect to link 2 is 12 m/s. Link 2 rotates at a constant speed of 120 rpm. The magnitude of Coriolis component of acceleration of link 1 is |
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Answer» In the figure shown, the relative velocity of link 1 with respect to link 2 is 12 m/s. Link 2 rotates at a constant speed of 120 rpm. The magnitude of Coriolis component of acceleration of link 1 is |
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| 20. |
If the digits are not allowed to repeat in any number formed by using the digits 0,2,4,6,8, then the number of all numbers greater than 10,000 is equal to |
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Answer» If the digits are not allowed to repeat in any number formed by using the digits 0,2,4,6,8, then the number of all numbers greater than 10,000 is equal to |
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| 21. |
Let the Fourier transform of a signal is represented as X(jω)=jddω⎧⎪⎨⎪⎩ejω51+jω3⎫⎪⎬⎪⎭ then the value of inverse fourier transform at t=0 will be_____.0 |
Answer» Let the Fourier transform of a signal is represented as X(jω)=jddω⎧⎪⎨⎪⎩ejω51+jω3⎫⎪⎬⎪⎭ then the value of inverse fourier transform at t=0 will be_____.
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| 22. |
32.Which will increase the vapour pressure of one molal aq. KI solution? (1) Adding HgI_2 (2) Adding one molal aq. KI (3) adding I_2 (4) adding NaI |
| Answer» 32.Which will increase the vapour pressure of one molal aq. KI solution? (1) Adding HgI_2 (2) Adding one molal aq. KI (3) adding I_2 (4) adding NaI | |
| 23. |
A particle is projected with velocity 50 m/sec at angle 37° with horizontal, then change in velocity of particle from point of projection to just before striking ground is :- (1) zero (2) 60 m/sec (3) 80 m/sec (4) 100 m/sec |
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| 24. |
What is marginal propensity to consume? How is it related to marginal propensity to save? |
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Answer» What is marginal propensity to consume? How is it related to marginal propensity to save? |
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| 25. |
A particle of mass m is thrown horizontally from the top of a tower and another particle of mass 2m is thrown vertically upward. The acceleration of centre of mass is? |
| Answer» A particle of mass m is thrown horizontally from the top of a tower and another particle of mass 2m is thrown vertically upward. The acceleration of centre of mass is? | |
| 26. |
The isothermal Bulk modulus of an ideal gas at pressure P is |
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Answer» The isothermal Bulk modulus of an ideal gas at pressure P is |
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| 27. |
Two drops of equal radii are falling through air with a terminal velocity of 5 cms.If they coalesce into one drop ,what will be the terminal velocity of the new drop. |
| Answer» Two drops of equal radii are falling through air with a terminal velocity of 5 cms.If they coalesce into one drop ,what will be the terminal velocity of the new drop. | |
| 28. |
A bull of mass m is moving towards a player withvelicity v. If player stopped it, then impulseapplied by the player is(2) +mv-mv(4) +2mv(3) -2mvxoot? why it is not +mv |
| Answer» A bull of mass m is moving towards a player withvelicity v. If player stopped it, then impulseapplied by the player is(2) +mv-mv(4) +2mv(3) -2mvxoot? why it is not +mv | |
| 29. |
Three concentric metallic spherical shells of radii R, 2R, 3R are given charges Q1, Q2, Q3, respectively. It is found that the surface charge densities on the outer surfaces of the shells are equal. Then, the ratio of the charges given to the shells, Q1 : Q2 : Q3, is :- (1) 1 : 2 : 3 (2) 1 : 3 : 5 (3) 1 : 8 : 27(4) 1 : 8 : 18 |
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Answer» Three concentric metallic spherical shells of radii R, 2R, 3R are given charges Q1, Q2, Q3, respectively. It is found that the surface charge densities on the outer surfaces of the shells are equal. Then, the ratio of the charges given to the shells, Q1 : Q2 : Q3, is :- (1) 1 : 2 : 3 (2) 1 : 3 : 5 (3) 1 : 8 : 27 (4) 1 : 8 : 18 |
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| 30. |
A DC of 2 A and an AC of peak value 2 A flows through resistances 2 Ω and 1 Ω respectively. Find the ratio of heat produced in the two resistances in the same time interval. |
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Answer» A DC of 2 A and an AC of peak value 2 A flows through resistances 2 Ω and 1 Ω respectively. Find the ratio of heat produced in the two resistances in the same time interval. |
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| 31. |
When a load is attached to the wire, the ratio of increase in elastic energy of the wire to the decrease in gravitational potential energy when load moves downwards by 1 mm, will be |
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Answer» When a load is attached to the wire, the ratio of increase in elastic energy of the wire to the decrease in gravitational potential energy when load moves downwards by 1 mm, will be |
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| 32. |
What is electrical discharge and what is electrical breakdown |
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Answer» What is electrical discharge and what is electrical breakdown |
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| 33. |
Si and Ge have identical physical dimension and identical reverse bias is applied across diodes. Then reverse current is a)more in Si b)more in Ge c)identcal in both |
| Answer» Si and Ge have identical physical dimension and identical reverse bias is applied across diodes. Then reverse current is a)more in Si b)more in Ge c)identcal in both | |
| 34. |
In Column - I, Consider each process just before and just after it occurs. Initial system is isolated from all other bodies. Considering all product particles (even those having rest mass zero ) in the system , Match the system in column-I with the result they produce in column - II.Column - IColumn - II(A) Spontaneous radioactive decay of an uranium nucleus initially at rest as given by reaction 23892U→23490Th+42He+...(p) Number of protons is increased(B) Fusion reaction of two hydrogen nucleias given by reaction 11H+11H→21H+....(q) Momentum is conserved (C) Fission of U235nucleus initiated by a thermal neutron as given by reaction 10n+23592U→14456Ba+8936Kr+310n+....(r)Mass is converted to energy or vice versa (D) β−decay (negative beta decay)(s) Charge is conserved |
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Answer» In Column - I, Consider each process just before and just after it occurs. Initial system is isolated from all other bodies. Considering all product particles (even those having rest mass zero ) in the system , Match the system in column-I with the result they produce in column - II. |
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| 35. |
Q. if x=Asin ωt where A and ω are constant then find dx/dt |
| Answer» Q. if x=Asin ωt where A and ω are constant then find dx/dt | |
| 36. |
On fission of one nucleus of U235, the amount of energy obtained is 200 MeV. The power obtained in a reactor is 1000 kW. Number of nuclei fissioned per second in the reactor is |
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Answer» On fission of one nucleus of U235, the amount of energy obtained is 200 MeV. The power obtained in a reactor is 1000 kW. Number of nuclei fissioned per second in the reactor is |
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| 37. |
When a satellite in a circular orbit around the Earth enters the atmospheric region, it encounters small airresistance to its motion. Then(A) Its kinetic energy increases(B) Its kinetic energy decreases(C) Its angular momentum about the Earth decreases(D) Its period of revolution around the Earth increases |
| Answer» When a satellite in a circular orbit around the Earth enters the atmospheric region, it encounters small airresistance to its motion. Then(A) Its kinetic energy increases(B) Its kinetic energy decreases(C) Its angular momentum about the Earth decreases(D) Its period of revolution around the Earth increases | |
| 38. |
Fouridentical hollow cylindrical columns of mild steel support a bigstructure of mass 50,000 kg. The inner and outer radii of each columnare 30 cm and 60 cm respectively. Assuming the load distribution tobe uniform, calculate the compressional strain of each column. |
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Answer» Four |
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| 39. |
The equation of a travelling wave on a stretched string of linear density 5 g m−1 is y=0.03sin(450t−9x) where distance and time are measured in SI units. The tension in the string is: |
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Answer» The equation of a travelling wave on a stretched string of linear density 5 g m−1 is y=0.03sin(450t−9x) where distance and time are measured in SI units. The tension in the string is: |
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| 40. |
The current measured by the ammeter in the circuit shown isDiagram |
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Answer» The current measured by the ammeter in the circuit shown is |
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| 41. |
The unit of length convenient on the nuclear scale is a fermi : 1 f = 10¯¹⁵ m. Nuclear sizes obey roughly the following empirical relation : r = rₒ A⅓ where r is the radius of the nucleus, A its mass number, and ro is a constant equal to about, 1.2 f. Show that the rule implies that nuclear mass density is nearly constant for different nuclei. Estimate the mass density of sodium nucleus. Compare it with the average mass density of a sodium atom obtained in Exercise. 2.27. |
| Answer» The unit of length convenient on the nuclear scale is a fermi : 1 f = 10¯¹⁵ m. Nuclear sizes obey roughly the following empirical relation : r = rₒ A⅓ where r is the radius of the nucleus, A its mass number, and ro is a constant equal to about, 1.2 f. Show that the rule implies that nuclear mass density is nearly constant for different nuclei. Estimate the mass density of sodium nucleus. Compare it with the average mass density of a sodium atom obtained in Exercise. 2.27. | |
| 42. |
Find the charge on each capacitance, in the given circuit? (in μC) |
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Answer» Find the charge on each capacitance, in the given circuit? (in μC) |
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| 43. |
An electric bulb is designed to operate at 220 V DC. If this bulb is connected to an AC source, it gives the same brightness. What would be the peak voltage of AC? |
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Answer» An electric bulb is designed to operate at 220 V DC. If this bulb is connected to an AC source, it gives the same brightness. What would be the peak voltage of AC? |
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| 44. |
In a series RLC circuit, the r.m.s voltage across the resistor and the inductor are respectively 400V and 700V. If the equation for the applied voltage is e=500\ast2^1/2sinwt, then the peak voltage across the capacitor is(1)1200V(2)1200\ast2^1/2V(3)400V(4)400\ast2^1/2V |
| Answer» In a series RLC circuit, the r.m.s voltage across the resistor and the inductor are respectively 400V and 700V. If the equation for the applied voltage is e=500\ast2^1/2sinwt, then the peak voltage across the capacitor is(1)1200V(2)1200\ast2^1/2V(3)400V(4)400\ast2^1/2V | |
| 45. |
40. The hybridisation of p atom in solid pcl5 is |
| Answer» 40. The hybridisation of p atom in solid pcl5 is | |
| 46. |
A source of sound and are arranged as shown in the figure. The detector is moving along a circle with constant angular speed ω. It starts from shown location in anticlockwise direction at t = 0. Velocity of sound in air is V. The time at which the detector will hear the maximum frequency for the first time is 5πkω. Then the value of K is |
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Answer» A source of sound and are arranged as shown in the figure. The detector is moving along a circle with constant angular speed ω. It starts from shown location in anticlockwise direction at t = 0. Velocity of sound in air is V. The time at which the detector will hear the maximum frequency for the first time is 5πkω. Then the value of K is
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| 47. |
A particle of mass 3 kg has been acted upon by a force F(N) whose variation with time (s) is shown in the figure. If the particle is moving along a straight line with initial velocity of 4 m/s, then find the final velocity of the particle. |
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Answer» A particle of mass 3 kg has been acted upon by a force F(N) whose variation with time (s) is shown in the figure. |
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| 48. |
The pipe shows the volume flow rate of an ideal liquid at a certain time and its direction. What is the value of Q in m3/s?(Assume steady state and equal area of cross section at each opening) |
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Answer» The pipe shows the volume flow rate of an ideal liquid at a certain time and its direction. What is the value of Q in m3/s?(Assume steady state and equal area of cross section at each opening) |
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| 49. |
A network of resistance is constructed with R1 & R2 as shown in figure. The potential of points 1,2,3.......N are V1,V2......VN respectively, each having potential k times smaller than previous one, then ratio R1R2 is |
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Answer» A network of resistance is constructed with R1 & R2 as shown in figure. The potential of points 1,2,3.......N are V1,V2......VN respectively, each having potential k times smaller than previous one, then ratio R1R2 is |
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| 50. |
Two masses m1 and m2 are suspended together by a massless spring of spring constant k. When the masses are in equilibrium m1, is removed without disturbing the system, then the angular frequencyand amplitude of oscillations of m2 are |
| Answer» Two masses m1 and m2 are suspended together by a massless spring of spring constant k. When the masses are in equilibrium m1, is removed without disturbing the system, then the angular frequencyand amplitude of oscillations of m2 are | |
