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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. |
Consider the diffraction pattern obtained with a single slit, illuminated at normal incidence. At the angular position of the first diffraction minimum, the phase difference (in radians) between the wavelets from the opposite edges of the slit is: |
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Answer» Consider the diffraction pattern obtained with a single slit, illuminated at normal incidence. At the angular position of the first diffraction minimum, the phase difference (in radians) between the wavelets from the opposite edges of the slit is: |
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| 2. |
What is limiting line ? |
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| 3. |
the gravitational field in a region is given by E=(2→i+3→j)Nkg−1 Show that no work is done by th egravitational field when a particle is moved on the line 3y + 2x = 5 |
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Answer» the gravitational field in a region is given by E=(2→i+3→j)Nkg−1 Show that no work is done by th egravitational field when a particle is moved on the line 3y + 2x = 5 |
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| 4. |
For the equation, y=Asin2π(ax+bt+π/4), match the following columns. Column IColumn II(A) Frequency of wave(Hz)(p) a(B) wavelength of wave(m)(q) b(C) Phase difference between two points 14a m distance apart(r) π(D) Phase difference of a particle after a time interval of 18b s(s) π2(t) None of above |
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Answer» For the equation, y=Asin2π(ax+bt+π/4), match the following columns. |
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| 5. |
A car rounds an unbanked curve of radius 92 m without skidding at a speed of 26 ms−1. The smallest possible coefficient of static friction between the tyres and the road is |
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Answer» A car rounds an unbanked curve of radius 92 m without skidding at a speed of 26 ms−1. The smallest possible coefficient of static friction between the tyres and the road is |
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| 6. |
A body of mass 2 kg slide down a curved track which is quadrant of a circle of radius 2 m. All the surfaces are frictionless. If the body starts from rest, its speed at the bottom of the track is (g=10 m/s2) |
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Answer» A body of mass 2 kg slide down a curved track which is quadrant of a circle of radius 2 m. All the surfaces are frictionless. If the body starts from rest, its speed at the bottom of the track is |
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| 7. |
A wave train is moving along light thread it is reflected from heavy threads, then the phase difference between incident & reflected wave at boundary is: |
Answer»  A wave train is moving along light thread it is reflected from heavy threads, then the phase difference between incident & reflected wave at boundary is: |
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| 8. |
The blocks A and B shown in fig. Have masses MA=5kg and MB=4kg. The system is released from rest. The speed of B after A has travelled a distance 1 m along the incline is |
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Answer» The blocks A and B shown in fig. Have masses MA=5kg and MB=4kg. The system is released from rest. The speed of B after A has travelled a distance 1 m along the incline is |
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| 9. |
A ray of light is incident at an angle of incidence ‘i’ on one face of a prism of angle A (assumed to be small) and emerge normally from the opposite face. If the refractive index of the prism is μ, the angle of incidence i, is nearly equal to: |
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Answer» A ray of light is incident at an angle of incidence ‘i’ on one face of a prism of angle A (assumed to be small) and emerge normally from the opposite face. If the refractive index of the prism is μ, the angle of incidence i, is nearly equal to: |
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| 10. |
4 eV is the energy of the incident photon and the work function in 2eV. What is the stopping potential |
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Answer» 4 eV is the energy of the incident photon and the work function in 2eV. What is the stopping potential |
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| 11. |
Two copper surfaces of same radii,one hollow and other solid are charged to same potential.Which of these will have more charge? |
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Answer» Two copper surfaces of same radii,one hollow and other solid are charged to same potential.Which of these will have more charge? |
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| 12. |
what is rebound velocity |
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Answer» what is rebound velocity |
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| 13. |
What is means of equilibration vector? |
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Answer» What is means of equilibration vector? |
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| 14. |
What is meant by motion in one direction |
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Answer» What is meant by motion in one direction |
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| 15. |
Which of the following quantity/quantities have negative value during adsorption ? |
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Answer» Which of the following quantity/quantities have negative value during adsorption ? |
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| 16. |
If de Broglie wavelength of an electron is 1 A. What is the kinetic energy ? |
| Answer» If de Broglie wavelength of an electron is 1 A. What is the kinetic energy ? | |
| 17. |
Is it possible to fly a kite up till space? Will it ever reach zero gravity while string still reaching Earth? If we connect the kite to a Geo Stationary satelite, will we be able to create a space elevator from it? |
| Answer» Is it possible to fly a kite up till space? Will it ever reach zero gravity while string still reaching Earth? If we connect the kite to a Geo Stationary satelite, will we be able to create a space elevator from it? | |
| 18. |
The effective resistance of the following infinite ladder network between the points A and B is |
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Answer» The effective resistance of the following infinite ladder network between the points A and B is |
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| 19. |
When an ideal diatomic gas is heated at a constant pressure, then what fraction of heat energy is used to increase the internal energy of the gas system? |
| Answer» When an ideal diatomic gas is heated at a constant pressure, then what fraction of heat energy is used to increase the internal energy of the gas system? | |
| 20. |
What is half projectile motion? |
| Answer» What is half projectile motion? | |
| 21. |
In the following circuit, the supply voltage is defined as: V(t) = 230 sin( 314t - π/6) and L = 2.2H. Determine the value of the current flowing through the coil. |
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Answer» In the following circuit, the supply voltage is defined as: V(t) = 230 sin( 314t - π/6) and L = 2.2H. Determine the value of the current flowing through the coil. |
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| 22. |
In a vernier calipers 10 smallest divisions of the vernier scale are equal to 9 smallest divisions of the main scale. If the smallest division of the main scale is half millimeter, then the vernier constant is: |
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Answer» In a vernier calipers 10 smallest divisions of the vernier scale are equal to 9 smallest divisions of the main scale. If the smallest division of the main scale is half millimeter, then the vernier constant is: |
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| 23. |
A spring for spring constant 240 Nm−1 is compressed by 10cm whereas another similar spring is extended by 10cm. The difference of the stored potential energies of two springs is |
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Answer» A spring for spring constant 240 Nm−1 is compressed by 10cm whereas another similar spring is extended by 10cm. The difference of the stored potential energies of two springs is |
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| 24. |
The maximum tension in the string of an oscillating pendulum is double of the minimum tension. Find the angular amplitude. |
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Answer» The maximum tension in the string of an oscillating pendulum is double of the minimum tension. Find the angular amplitude. |
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| 25. |
A non-conducting rod AB of length l has a total charge q. The rod is rotated about an axis passing through its center of mass with a constant angular velocity ω as shown in the figure. The magnetic moment of the rod is |
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Answer» A non-conducting rod AB of length l has a total charge q. The rod is rotated about an axis passing through its center of mass with a constant angular velocity ω as shown in the figure. The magnetic moment of the rod is |
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| 26. |
The acceleration of a particle, starting from rest, varies with time according to the relation a = Kt + C, where K and C are constants of motion. The velocity ‘V’ of the particle after a time ‘t’ will be |
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Answer» The acceleration of a particle, starting from rest, varies with time according to the relation a = Kt + C, where K and C are constants of motion. The velocity ‘V’ of the particle after a time ‘t’ will be |
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| 27. |
A proton beam enters a magnetic field of 10−4 Wb m−2 normally. If the specific charge of the proton is 1011 C kg−1 and its velocity is 109ms−1, then the radius of the circle described will be |
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Answer» A proton beam enters a magnetic field of 10−4 Wb m−2 normally. If the specific charge of the proton is 1011 C kg−1 and its velocity is 109ms−1, then the radius of the circle described will be |
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| 28. |
The plot of characteristic frequency ‘f’ in case of Ky –X–rays, with the atomic number ‘Z’ of an element may be best represented by |
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Answer» The plot of characteristic frequency ‘f’ in case of Ky –X–rays, with the atomic number ‘Z’ of an element may be best represented by |
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| 29. |
A stone of mass m is attached to one end of a wire of cross-sectional area A and young’s modulus Y. The stone is revolved in a horizontal circle at a speed such that the wire makes an angle θ with the vertical. The strain produced in the wire will be, |
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Answer» A stone of mass m is attached to one end of a wire of cross-sectional area A and young’s modulus Y. The stone is revolved in a horizontal circle at a speed such that the wire makes an angle θ with the vertical. The strain produced in the wire will be, |
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| 30. |
A zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in figure. The current through the diode is |
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Answer» A zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in figure.
The current through the diode is |
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| 31. |
People living in houses far removed from municipal water tank often find it difficult to get water on the top floor even if it is situated lower than the level of the water tank. This is because: |
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Answer» People living in houses far removed from municipal water tank often find it difficult to get water on the top floor even if it is situated lower than the level of the water tank. This is because: |
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| 32. |
A one metre long stretched string having a mass of 40 g is attached to a tuning fork. The fork vibrates at 128 Hz in a direction perpendicular to the string. What should be the tension in the string if it is to vibrate in four loops ? |
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Answer» A one metre long stretched string having a mass of 40 g is attached to a tuning fork. The fork vibrates at 128 Hz in a direction perpendicular to the string. What should be the tension in the string if it is to vibrate in four loops ? |
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| 33. |
Three charges 4q, Q and q are in a straight line in the position of 0, l2 and l respectively. The resultant force on q will be zero, if Q= |
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Answer» Three charges 4q, Q and q are in a straight line in the position of 0, l2 and l respectively. The resultant force on q will be zero, if Q= |
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| 34. |
In the arrangement shown in figure (15-E6), the string has a mass of 4.5 g. How much time will it take for a transverse disturbance produced at the floor to reach the pulley ? Take g=10 ms−2. |
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Answer» In the arrangement shown in figure (15-E6), the string has a mass of 4.5 g. How much time will it take for a transverse disturbance produced at the floor to reach the pulley ? Take g=10 ms−2.
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| 35. |
The operating temperature of the filament of lamp is 2000 ∘C. The temperature coefficient of the material of filament is 0.005 ∘C−1. If the atmospheric temperature is 0 ∘C, then the current in the 100 W−200 V lamp when it is switched on is nearest to |
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Answer» The operating temperature of the filament of lamp is 2000 ∘C. The temperature coefficient of the material of filament is 0.005 ∘C−1. If the atmospheric temperature is 0 ∘C, then the current in the 100 W−200 V lamp when it is switched on is nearest to |
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| 36. |
Consider a bent tube lowered slightly into a water stream as shown in figure. The velocity of stream relative to the tube is equal to v=5 ms−1. The closed upper end of the tube located at the height h0=10 cm has a small orifice. The height ′h′ to which water jet spurts (in m) is |
Answer» Consider a bent tube lowered slightly into a water stream as shown in figure. The velocity of stream relative to the tube is equal to v=5 ms−1. The closed upper end of the tube located at the height h0=10 cm has a small orifice. The height ′h′ to which water jet spurts (in m) is 
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| 37. |
Two capillary tubes of same diameter are put vertically one each in two liquids whose relative densities are 0.8 and 0.6 and surface tensions are 60 and 50 dyne/cm respectively. Ratio of heights of liquids in the two tubes h1h2 is |
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Answer» Two capillary tubes of same diameter are put vertically one each in two liquids whose relative densities are 0.8 and 0.6 and surface tensions are 60 and 50 dyne/cm respectively. Ratio of heights of liquids in the two tubes h1h2 is |
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| 38. |
Why are ventilators provided in our houses? |
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Answer» Why are ventilators provided in our houses? |
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| 39. |
A bullet is fired with a velocity of 196 ms−1 at an angle 30∘ with the horizontal. Calculate the maximum height attained by the bullet. (Take g=9.8 m/s2) |
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Answer» A bullet is fired with a velocity of 196 ms−1 at an angle 30∘ with the horizontal. Calculate the maximum height attained by the bullet. (Take g=9.8 m/s2) |
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| 40. |
A metal ball falls from a height of 32 m on a steel plate. If the coefficient of restitution is 0.5, to what height will the ball rise after the second bounce |
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Answer» A metal ball falls from a height of 32 m on a steel plate. If the coefficient of restitution is 0.5, to what height will the ball rise after the second bounce |
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| 41. |
A large conducting plane has a surface charge density 1.0×10−4 C m−2. Find the electrostatic energy stored in a cubical volume of edge 1.0 cm in front of the plane. |
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Answer» A large conducting plane has a surface charge density 1.0×10−4 C m−2. Find the electrostatic energy stored in a cubical volume of edge 1.0 cm in front of the plane. |
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| 42. |
Two particles, carrying charges - q and +q and having equal masses m each are fixed at the ends of a light rod of length a to form a dipole. The rod is clamped at an end and is placed in a uniform electric field E with slightly tilted and then released. Neglecting gravity find the time period of small oscillations. |
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Answer» Two particles, carrying charges - q and +q and having equal masses m each are fixed at the ends of a light rod of length a to form a dipole. The rod is clamped at an end and is placed in a uniform electric field E with slightly tilted and then released. Neglecting gravity find the time period of small oscillations. |
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| 43. |
The first overtone frequency of a closed organ pipe is equal to the second overtone frequency of an open organ pipe. If the length of the open pipe is 80 cm, what is the length of the closed organ pipe? |
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Answer» The first overtone frequency of a closed organ pipe is equal to the second overtone frequency of an open organ pipe. If the length of the open pipe is 80 cm, what is the length of the closed organ pipe? |
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| 44. |
If a, b, c are unit vectors such that a + b + c = 0, then find the value of a.b + b.c + c.a |
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Answer» If a, b, c are unit vectors such that a + b + c = 0, then find the value of a.b + b.c + c.a |
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| 45. |
Five capacitors of 10μF capacity each are connected to a d.c. potential of 100volts as shown in the adjoining figure. The equivalent capacitance between the points A and Bwill be equal to |
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Answer» Five capacitors of 10μF capacity each are connected to a d.c. potential of 100volts as shown in the adjoining figure. The equivalent capacitance between the points A and Bwill be equal to
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| 46. |
A projectile is thrown so as to have a maximum possible horizontal range of 400 m. Taking the point of projection as the origin, the co-ordinates of the point where the velocity of the projectile is minimum is |
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Answer» A projectile is thrown so as to have a maximum possible horizontal range of 400 m. Taking the point of projection as the origin, the co-ordinates of the point where the velocity of the projectile is minimum is |
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| 47. |
Eight identical resistors (r=152 Ω) are connected along edge of a pyramid having square base ABCD as shown in figure. Then equivalent resistance between A and D in Ω is (Write upto two digits after the decimal point.) |
Answer» Eight identical resistors (r=152 Ω) are connected along edge of a pyramid having square base ABCD as shown in figure. Then equivalent resistance between A and D in Ω is 
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| 48. |
The resistance between points M and N in the circuit is |
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Answer» The resistance between points M and N in the circuit is |
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| 49. |
A wave travelling in the +ve x-direction having displacement along y-direction as 1m, wavelength 2πm and frequency of 1π Hz is represented by |
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Answer» A wave travelling in the +ve x-direction having displacement along y-direction as 1m, wavelength 2πm and frequency of 1π Hz is represented by |
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| 50. |
The energy of an electron in excited hydrogen atom is -3.4 eV. Then according to Bohr's theory the angular momentum of the electron in J-s is |
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Answer» The energy of an electron in excited hydrogen atom is -3.4 eV. Then according to Bohr's theory the angular momentum of the electron in J-s is |
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