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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. |
Why are metals sonorous? |
| Answer» Why are metals sonorous? | |
| 2. |
If S=ut+12at2, where S is displacement, u is initial velocity (constant), a is acceleration (constant) and t is time taken, then differentiation of S w.r.t. t will be |
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Answer» If S=ut+12at2, where S is displacement, u is initial velocity (constant), a is acceleration (constant) and t is time taken, then differentiation of S w.r.t. t will be |
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| 3. |
If π∫0xsin7xcos6xdx=aπ3003, then the value of a is |
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Answer» If π∫0xsin7xcos6xdx=aπ3003, then the value of a is |
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| 4. |
Density of a gas is found to be 5.46 g/dm3 at 27∘C and 2 atm pressure. What will be its density at STP? |
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Answer» Density of a gas is found to be 5.46 g/dm3 at 27∘C and 2 atm pressure. What will be its density at STP? |
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| 5. |
Why gravitational force follow the super-position principle while electrostatic force doesn't follow? |
| Answer» Why gravitational force follow the super-position principle while electrostatic force doesn't follow? | |
| 6. |
An object is at a dis†an ce 25 cm from the curved surface of a glass hemisphere of radius 10 cm. Find the position of the image and draw the ray diagram. (μ_g=1.5 |
| Answer» An object is at a dis†an ce 25 cm from the curved surface of a glass hemisphere of radius 10 cm. Find the position of the image and draw the ray diagram. (μ_g=1.5 | |
| 7. |
In the figure, the value of the load resistor R which maximizes the power delivered to it is |
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Answer» In the figure, the value of the load resistor R which maximizes the power delivered to it is |
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| 8. |
The motion of centre of mass of a system of two particles is unaffected by their internal forces |
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Answer» The motion of centre of mass of a system of two particles is unaffected by their internal forces |
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| 9. |
The speed of a projectile at the highest point becomes 1√2times its initial speed. The horizontal range of the projectile will be |
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Answer» The speed of a projectile at the highest point becomes 1√2times its initial speed. The horizontal range of the projectile will be |
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| 10. |
A person watching through the window of an apartment sees a ball that rises vertically up and then vertically down for a total time of 0.5 seconds. If the height of the window is 2 metre then find the maximum height above the windows reached by the ball. |
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Answer» A person watching through the window of an apartment sees a ball that rises vertically up and then vertically down for a total time of 0.5 seconds. If the height of the window is 2 metre then find the maximum height above the windows reached by the ball. |
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| 11. |
What is the S.I. unit of rate of change of momentum? |
| Answer» What is the S.I. unit of rate of change of momentum? | |
| 12. |
A magnetic field of 100 G (1 G = 10–4 T) is required which is uniformin a region of linear dimension about 10 cm and area of cross-sectionabout 10–3 m2. The maximum current-carrying capacity of a givencoil of wire is 15 A and the number of turns per unit length that canbe wound round a core is at most 1000 turns m–1. Suggest someappropriate design particulars of a solenoid for the required purpose.Assume the core is not ferromagnetic. |
| Answer» A magnetic field of 100 G (1 G = 10–4 T) is required which is uniformin a region of linear dimension about 10 cm and area of cross-sectionabout 10–3 m2. The maximum current-carrying capacity of a givencoil of wire is 15 A and the number of turns per unit length that canbe wound round a core is at most 1000 turns m–1. Suggest someappropriate design particulars of a solenoid for the required purpose.Assume the core is not ferromagnetic. | |
| 13. |
The figure shows a uniform magnetic field B confined to a cylindrical volume and is increasing at a constant rate. The instantaneous acceleration experienced by an electron placed at P is |
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Answer» The figure shows a uniform magnetic field B confined to a cylindrical volume and is increasing at a constant rate. The instantaneous acceleration experienced by an electron placed at P is |
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| 14. |
110.A particle performs SHM in a straightline.In the first second ,starting from rest ,it travels a distance a and in the next second travels a distance b in the same side of mean position.The amplitude of SHM is a)a-b b)2a-b/3 c)2asquare/3a-b d)none of these |
| Answer» 110.A particle performs SHM in a straightline.In the first second ,starting from rest ,it travels a distance a and in the next second travels a distance b in the same side of mean position.The amplitude of SHM is a)a-b b)2a-b/3 c)2asquare/3a-b d)none of these | |
| 15. |
Four identical blocks of length L are arranged one over other ,the maximum dis†an ce of uppemost block from the edge of lower most block is x such that no block tumbles Then x is |
| Answer» Four identical blocks of length L are arranged one over other ,the maximum dis†an ce of uppemost block from the edge of lower most block is x such that no block tumbles Then x is | |
| 16. |
Question 22An automobile engine propels a 1000 kg car (A) along a leveled road at a speed of 36 kmph. Find the power if the opposing frictional force is 100 N. Now, suppose after travelling a distance of 200 m, this car collides with another stationary car (B) of same mass and comes to rest. Let its engine also stop at the same time. Now car (B) starts moving on the same level road without getting its engine started. Find the speed of the car (B) just after the collision. |
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Answer» Question 22 An automobile engine propels a 1000 kg car (A) along a leveled road at a speed of 36 kmph. Find the power if the opposing frictional force is 100 N. Now, suppose after travelling a distance of 200 m, this car collides with another stationary car (B) of same mass and comes to rest. Let its engine also stop at the same time. Now car (B) starts moving on the same level road without getting its engine started. Find the speed of the car (B) just after the collision. |
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| 17. |
A bead of mass m is attached to one end of a spring of natural length 𝑅 and spring constant K=((√3+1) mg)/R . The other end of spring is fixed at a point A on a smooth vertical ring of radius R as shown in the figure. The normal reaction at B just after it is released to move is |
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Answer» A bead of mass m is attached to one end of a spring of natural length 𝑅 and spring constant K=((√3+1) mg)/R . The other end of spring is fixed at a point A on a smooth vertical ring of radius R as shown in the figure. The normal reaction at B just after it is released to move is |
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| 18. |
A convergent lens made of crown glass (refractive index 1.5) has focal length 20cm in air. If it is immersed in a liquid of refractive index 1.60, its focal length will be: |
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Answer» A convergent lens made of crown glass (refractive index 1.5) has focal length 20cm in air. If it is immersed in a liquid of refractive index 1.60, its focal length will be: |
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| 19. |
Gravitational potential in a region is given by+4y+ 12z) J/kg. The modulus of1, y= 0, z = 3) isVgravitational field at (x(2) 13 N/kg(1) 20 N/kg(4) 5 N/kg(3) 12 N/kgenhare |
| Answer» Gravitational potential in a region is given by+4y+ 12z) J/kg. The modulus of1, y= 0, z = 3) isVgravitational field at (x(2) 13 N/kg(1) 20 N/kg(4) 5 N/kg(3) 12 N/kgenhare | |
| 20. |
What is the total distance travelled till 30 seconds? |
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Answer»
What is the total distance travelled till 30 seconds? |
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| 21. |
A block of mass 50 kg can slide on a rough horizontal surface. The coefficient of friction between the block and the surface is 0.6. The least force of pull acting at an angle of 30o to the upward drawn vertical which causes the block to just slide is |
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Answer» A block of mass 50 kg can slide on a rough horizontal surface. The coefficient of friction between the block and the surface is 0.6. The least force of pull acting at an angle of 30o to the upward drawn vertical which causes the block to just slide is |
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| 22. |
Apoint charge +10 μC is a distance 5 cm directly above the centreof a square of side 10 cm, as shown in Fig. 1.34. What is themagnitude of the electric flux through the square? (Hint:Think of the square as one face of acube with edge 10 cm.) |
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Answer» A
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| 23. |
4.A thin non conducting ring of mass m having total charge q can rotate freely about its osn axis. Initially, when the ring is stationery, a magnetic field B directed perpendicular to the plane is switched on . Find the angular velocity acquired by the ring . Find the induced magnetjc moment. |
| Answer» 4.A thin non conducting ring of mass m having total charge q can rotate freely about its osn axis. Initially, when the ring is stationery, a magnetic field B directed perpendicular to the plane is switched on . Find the angular velocity acquired by the ring . Find the induced magnetjc moment. | |
| 24. |
If vector sum of two vector is also a unit vector. Then calculate the magnitude of their vector subtraction |
| Answer» If vector sum of two vector is also a unit vector. Then calculate the magnitude of their vector subtraction | |
| 25. |
add vectors A,B and C each having the magnitude of 100 unit and inclined to the x-axis at angle 45 degree, 135 degree and 351 degree respectively |
| Answer» add vectors A,B and C each having the magnitude of 100 unit and inclined to the x-axis at angle 45 degree, 135 degree and 351 degree respectively | |
| 26. |
If the frequency of sound produced by a siren increases from 400 Hz to 1200 Hz keeping the amplitude constant. The ratio of the intensity of sound produced at frequency 1200 Hz and 400 Hz will be |
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Answer» If the frequency of sound produced by a siren increases from 400 Hz to 1200 Hz keeping the amplitude constant. The ratio of the intensity of sound produced at frequency 1200 Hz and 400 Hz will be |
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| 27. |
The length of a magnet is very large as compared to its width and breadth. The time period of its oscillation in a vibration magnetometer is 2 s. The magnetic is cut perpendicular to its length in to three equal parts and three parts are then placed on each other with their like poles together. The time period of this combination will be (1) 2 s(2) 2/3 s (3)2\sqrt3s (4)2/\sqrt[{}]3 |
| Answer» The length of a magnet is very large as compared to its width and breadth. The time period of its oscillation in a vibration magnetometer is 2 s. The magnetic is cut perpendicular to its length in to three equal parts and three parts are then placed on each other with their like poles together. The time period of this combination will be (1) 2 s(2) 2/3 s (3)2\sqrt3s (4)2/\sqrt[{}]3 | |
| 28. |
A block of mass m is connected to springs as shown in the figure. Find the time period of small oscillations.[All springs are identical] |
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Answer» A block of mass m is connected to springs as shown in the figure. Find the time period of small oscillations. |
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| 29. |
The ratio of maximum to minimum intensity at a place due to superposition of two waves represented by y1=3sin(200t) cm and y2=4cos(208t) cm, will be ? here the intensity of individual wave is proportional to (amplitude)^2 or (frequency)^{2 }(amplitude)^2 |
| Answer» The ratio of maximum to minimum intensity at a place due to superposition of two waves represented by y1=3sin(200t) cm and y2=4cos(208t) cm, will be ? here the intensity of individual wave is proportional to (amplitude)^2 or (frequency)^{2 }(amplitude)^2 | |
| 30. |
A bulb is rated at 100 V & 100 W it can be treated as a resistor. Find out the inductance of an inductor (called choke coil) that should be connected in series with the bulb to operate the bulb at its rated power with the help of an ac source of 200 V and 50 Hz |
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Answer» A bulb is rated at 100 V & 100 W it can be treated as a resistor. Find out the inductance of an inductor (called choke coil) that should be connected in series with the bulb to operate the bulb at its rated power with the help of an ac source of 200 V and 50 Hz |
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| 31. |
A nucleus is at rest in the laboratory frame of reference. Show that if it disintegrates into two smaller nuclei the products must move in opposite directions. |
| Answer» A nucleus is at rest in the laboratory frame of reference. Show that if it disintegrates into two smaller nuclei the products must move in opposite directions. | |
| 32. |
Perfectly reflecting mirror of mass M mounted on a spring constitutes a spring mass system of angular frequency Ω, such that 4π MΩh=1034m−3, where h is planck constant, N photons of wavelength λ=8π×10−6 m strikes the mirror simultaneously at normal incidence such that the mirror gets displaced by 1μ m. If the value of N is x×10−2, then the value of x is |
Answer» Perfectly reflecting mirror of mass M mounted on a spring constitutes a spring mass system of angular frequency Ω, such that 4π MΩh=1034m−3, where h is planck constant, N photons of wavelength λ=8π×10−6 m strikes the mirror simultaneously at normal incidence such that the mirror gets displaced by 1μ m. If the value of N is x×10−2, then the value of x is  |
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| 33. |
A steel wire of length 4.7 m and cross-sectional area 3.0×10−5 m2 stretches by the same amount as a copper wire of length 3.5 m and cross-sectional area 4.0×10−5 m2 under a given load. Find the ratio of the Young's modulus of steel to that of copper |
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Answer» A steel wire of length 4.7 m and cross-sectional area 3.0×10−5 m2 stretches by the same amount as a copper wire of length 3.5 m and cross-sectional area 4.0×10−5 m2 under a given load. Find the ratio of the Young's modulus of steel to that of copper |
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| 34. |
if a diode and a capacitor is connectedin seri across an ac source having an rms voltage v then voltage across capacitor is? |
| Answer» if a diode and a capacitor is connectedin seri across an ac source having an rms voltage v then voltage across capacitor is? | |
| 35. |
a projectile projected with speed 60 m/s at 60 from horizontal It will be at same height at insatnt |
| Answer» a projectile projected with speed 60 m/s at 60 from horizontal It will be at same height at insatnt | |
| 36. |
∫{1+2 tan x(tan x+sec x)}12 dx is equal to |
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Answer» ∫{1+2 tan x(tan x+sec x)}12 dx is equal to |
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| 37. |
In the figure shown below, a ball is moving with a velocity of u1=7 m/s in downward direction towards a surface, while the surface is moving in upward direction with velocity u2=3 m/s. If the coefficient of restitution has value of e=0.8 and after collision with the surface, the ball rebounds back with velocity v m/s, find the rebound velocity. (Neglect all external forces) |
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Answer» In the figure shown below, a ball is moving with a velocity of u1=7 m/s in downward direction towards a surface, while the surface is moving in upward direction with velocity u2=3 m/s. If the coefficient of restitution has value of e=0.8 and after collision with the surface, the ball rebounds back with velocity v m/s, find the rebound velocity. (Neglect all external forces) |
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| 38. |
A particle moves under the force F=(x2−6x) N, where x is in metres. For small displacements from the origin, what is the force constant in N/m in the simple harmonic motion approximation? |
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Answer» A particle moves under the force F=(x2−6x) N, where x is in metres. For small displacements from the origin, what is the force constant in N/m in the simple harmonic motion approximation? |
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| 39. |
A concrete sphere of radius R has a spherical cavity of radius r which is packed with sawdust. The specific gravities of concrete and sawdust are respectively 2.4 and 0.3. For this sphere to float with its entire volume submerged under water, ratio of mass of concrete to the mass of sawdust will be |
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Answer» A concrete sphere of radius R has a spherical cavity of radius r which is packed with sawdust. The specific gravities of concrete and sawdust are respectively 2.4 and 0.3. For this sphere to float with its entire volume submerged under water, ratio of mass of concrete to the mass of sawdust will be |
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| 40. |
A horizontal constant force F is applied at the top point of uniform solid cylinder so that it starts pure rolling. Acceleration of cylinder is : |
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Answer» A horizontal constant force F is applied at the top point of uniform solid cylinder so that it starts pure rolling. Acceleration of cylinder is : |
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| 41. |
heliocentric theory |
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Answer» heliocentric theory |
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| 42. |
A water pipe has an internal diameter of 10 cm. Water flows it at the rate of 20 m/sec. The water jet strikes normally on a wall and falls dead. Find the force( in N upto two decimal places) on the wall.(Assume π=3.14) |
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Answer» A water pipe has an internal diameter of 10 cm. Water flows it at the rate of 20 m/sec. The water jet strikes normally on a wall and falls dead. Find the force( in N upto two decimal places) on the wall.(Assume π=3.14) |
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| 43. |
A force of 25 N is applied individually on two objects A and B such that the acceleration of A and B is in the ratio 4 : 3. If the force is increased to 30 N, then the difference in the ratios of new and earlier accelerations is: |
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Answer» A force of 25 N is applied individually on two objects A and B such that the acceleration of A and B is in the ratio 4 : 3. If the force is increased to 30 N, then the difference in the ratios of new and earlier accelerations is: |
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| 44. |
Velocity of body moving along a straight line is v=2t²e–t. The acceleration of body is zero at t= |
| Answer» Velocity of body moving along a straight line is v=2t²e–t. The acceleration of body is zero at t= | |
| 45. |
A saturn year is 29.5 times the earth year. How far is the saturn from the sun if the earth is 1.50× 10⁸ km away from the sun ? |
| Answer» A saturn year is 29.5 times the earth year. How far is the saturn from the sun if the earth is 1.50× 10⁸ km away from the sun ? | |
| 46. |
12.describe keplers law with respect to newtons law? |
| Answer» 12.describe keplers law with respect to newtons law? | |
| 47. |
38. When a balloon is inflated , does it violate Boyle's Law? Explain. |
| Answer» 38. When a balloon is inflated , does it violate Boyle's Law? Explain. | |
| 48. |
What will be the equivalent resistance between the terminals A and B of the infinite resistive network shown in figure ? |
Answer»  What will be the equivalent resistance between the terminals A and B of the infinite resistive network shown in figure ? |
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| 49. |
29.A balloon is moving vertically with a velocity of 4 metre per second .when it is at a height of h,a body is gently release from it.if it reaches the ground in 4 seconds ,the height of the balloon when the body is released is A)62.4m B)42.4m C)78.4 D)89.2 In above problem what is the height of balloon when the body strikes the ground ? |
| Answer» 29.A balloon is moving vertically with a velocity of 4 metre per second .when it is at a height of h,a body is gently release from it.if it reaches the ground in 4 seconds ,the height of the balloon when the body is released is A)62.4m B)42.4m C)78.4 D)89.2 In above problem what is the height of balloon when the body strikes the ground ? | |
| 50. |
a proton is acceleratef from rest through a potenial of 500 vvolts its final kinectic energy |
| Answer» a proton is acceleratef from rest through a potenial of 500 vvolts its final kinectic energy | |
