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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. |
State a law which determines the direction of magnetic field around a current carrying wire. |
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Answer» State a law which determines the direction of magnetic field around a current carrying wire. |
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| 2. |
Three long, straight parallel wires carrying current are arranged as shown in figure. The net magnetic force experienced by unit length of wire C is |
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Answer» Three long, straight parallel wires carrying current are arranged as shown in figure. The net magnetic force experienced by unit length of wire C is |
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| 3. |
In each of the following cases, where must an object be placed in front of a convex lens so that the image formed is (a) at infinity, (b) of same size as the object, (c) inverted and enlarged, (d) upright and enlarged ? |
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Answer» In each of the following cases, where must an object be placed in front of a convex lens so that the image formed is (a) at infinity, (b) of same size as the object, (c) inverted and enlarged, (d) upright and enlarged ? |
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| 4. |
Please fill in the blanks: Light rays from an object are refracted by the ____ and the ____ which focus the light rays onto the ____. The amount of light that reaches this light-sensitive layer is controlled by the ______ which is able to adjust the size of the _____. There are two types of light-sensitive cells, the ___, which are responsible for ___ vision in low light intensity, and the _____, which are responsible for ___vision in _____light intensity. The image formed on the _____ is _____ and _____ than the object, but the nerve impulses that pass along the _____ nerve to the brain are interpreted so that they make sense. The ability of the brain to compare incoming information with previous experience, and to set off the correct response, is called _____. |
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Answer» Please fill in the blanks: Light rays from an object are refracted by the ____ and the ____ which focus the light rays onto the ____. The amount of light that reaches this light-sensitive layer is controlled by the ______ which is able to adjust the size of the _____. There are two types of light-sensitive cells, the ___, which are responsible for ___ vision in low light intensity, and the _____, which are responsible for ___vision in _____light intensity. The image formed on the _____ is _____ and _____ than the object, but the nerve impulses that pass along the _____ nerve to the brain are interpreted so that they make sense. The ability of the brain to compare incoming information with previous experience, and to set off the correct response, is called _____. |
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| 5. |
114.A series LCR circuit is connected to an a.c. source of voltage V and angular frequency w. When only the capacitor is removed the current lags behind the voltage by a phase angle . And when the inductor is removed the current leads the voltage by same phase angle. Find the current flowing and the average power dissipated in LCR circuit. |
| Answer» 114.A series LCR circuit is connected to an a.c. source of voltage V and angular frequency w. When only the capacitor is removed the current lags behind the voltage by a phase angle . And when the inductor is removed the current leads the voltage by same phase angle. Find the current flowing and the average power dissipated in LCR circuit. | |
| 6. |
ntA dip needle arranged to move freely in the magnetic meridian dips by an angle theta.If the vertical plane in which the needle moves is rotated through an angle alpha to the magnetic meridian, then the needle will dip by an anglen nta)thetan ntb)alphan ntc)more than thetan ntd)less than thetan |
| Answer» ntA dip needle arranged to move freely in the magnetic meridian dips by an angle theta.If the vertical plane in which the needle moves is rotated through an angle alpha to the magnetic meridian, then the needle will dip by an anglen nta)thetan ntb)alphan ntc)more than thetan ntd)less than thetan | |
| 7. |
ntin an atom we say that mass of an atom is only due to proton and electron and not by electron.n ntbut when we add or remove electron in an atom the mass of atom changes.n ntexplain this statement.n |
| Answer» ntin an atom we say that mass of an atom is only due to proton and electron and not by electron.n ntbut when we add or remove electron in an atom the mass of atom changes.n ntexplain this statement.n | |
| 8. |
The figure shows a conducting circular loop of radius 50 cm is placed in a uniform, perpendicular magnetic field 4 T. A metal rod OA is pivoted at the centre O of the loop. The other end A of the rod touches the loop. The rod OA and loop are resistanceless but a resistor having a resistance 5 Ω is connected between O and a fixed point C on the loop. The rod OA is made to rotate anticlockwise at a uniform angular speed 20 rad/s by an external force. Find the external torque (in Nm) needed to keep the rod rotating with the constant angular velocity of 20 rad/s.(Give only integer value) |
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Answer» The figure shows a conducting circular loop of radius 50 cm is placed in a uniform, perpendicular magnetic field 4 T. A metal rod OA is pivoted at the centre O of the loop. The other end A of the rod touches the loop. The rod OA and loop are resistanceless but a resistor having a resistance 5 Ω is connected between O and a fixed point C on the loop. The rod OA is made to rotate anticlockwise at a uniform angular speed 20 rad/s by an external force. Find the external torque (in Nm) needed to keep the rod rotating with the constant angular velocity of 20 rad/s. (Give only integer value)  |
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| 9. |
An unchanged capacitor of capacitance 100 micro farad is connected to a battery of emf 20 V at t=0 through a resistance 10 ohm, then find: (a) the maximum rate at which energy is stored in the capacitor (b) time at which this maximum value is reached |
| Answer» An unchanged capacitor of capacitance 100 micro farad is connected to a battery of emf 20 V at t=0 through a resistance 10 ohm, then find: (a) the maximum rate at which energy is stored in the capacitor (b) time at which this maximum value is reached | |
| 10. |
Kayco Ltd. is a manufacturing detergent. It decides to lunch a new range of herbal products. The management plans to launch a new factory in a tribal are, where the required products are easily available and the labour-men, women and children are available for work at low (rates) wages in the absence of development opportunities and schools. (i) Will the decision to install a new unit in the tribal area help the society? Highlight the social values involved in this decision? |
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Answer» Kayco Ltd. is a manufacturing detergent. It decides to lunch a new range of herbal products. The management plans to launch a new factory in a tribal are, where the required products are easily available and the labour-men, women and children are available for work at low (rates) wages in the absence of development opportunities and schools. (i) Will the decision to install a new unit in the tribal area help the society? Highlight the social values involved in this decision? |
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| 11. |
What is the difference between Fleming left and right hand rule ? |
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Answer» What is the difference between Fleming left and right hand rule ? |
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| 12. |
In which of the following ways does the machine help us? |
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Answer» In which of the following ways does the machine help us? |
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| 13. |
Certain force acting on a 20 kg mass changes its velocity from 5 m s−1 to 2 m s−1. Calculate the work done by the force. |
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Answer» Certain force acting on a 20 kg mass changes its velocity from 5 m s−1 to 2 m s−1. Calculate the work done by the force. |
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| 14. |
33.Calculate the number of electrons in hundred grams of carbon dioxide. |
| Answer» 33.Calculate the number of electrons in hundred grams of carbon dioxide. | |
| 15. |
If the north pole of a bar magnet is brought closer to a spherical iron ball then where will its induced north pole be . |
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Answer» If the north pole of a bar magnet is brought closer to a spherical iron ball then where will its induced north pole be .
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| 16. |
An obliquely incident light ray bends at surface due to change in speed, when passing from one medium to another. The ray does not bend when it is incident normally. Will the ray have different speed in different medium.Expalin. |
| Answer» An obliquely incident light ray bends at surface due to change in speed, when passing from one medium to another. The ray does not bend when it is incident normally. Will the ray have different speed in different medium.Expalin. | |
| 17. |
What is electrolyte give some examples |
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Answer» What is electrolyte give some examples |
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| 18. |
when light of wavelengh 5000A^° in vaccum travels through same thickness in glass and water,the difference in the number of waves is 400.find thickness.(refractive indices of glass and water are 3/2and 4/3 respectively |
| Answer» when light of wavelengh 5000A^° in vaccum travels through same thickness in glass and water,the difference in the number of waves is 400.find thickness.(refractive indices of glass and water are 3/2and 4/3 respectively | |
| 19. |
How many types of cone cells are present in our eyes? |
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Answer» How many types of cone cells are present in our eyes? |
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| 20. |
Q3.when a magnet is bought close to a wire why the magnetic field around the wire increases? |
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Answer» Q3.when a magnet is bought close to a wire why the magnetic field around the wire increases? |
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| 21. |
Question 11 A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively (figure). Which of the following is true? (a) R1=R2=R3 (b) R1>R2>R3 (c) R3>R2>R1 (d) R2>R3>R1 |
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Answer» Question 11 |
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| 22. |
for a gas, the critical temperature and critical pressure are 27C and 500 atm respectively. the van der waals cons†an t b (mol^{-1^{}}) for the gas is A. 6.15\ast 10^{-3} B. 1.43\ast 10^{-3} C. 49.2\ast 10^{-3} D. 6.15\ast 10^{-2 |
| Answer» for a gas, the critical temperature and critical pressure are 27C and 500 atm respectively. the van der waals cons†an t b (mol^{-1^{}}) for the gas is A. 6.15\ast 10^{-3} B. 1.43\ast 10^{-3} C. 49.2\ast 10^{-3} D. 6.15\ast 10^{-2 | |
| 23. |
What are the properties of image formed on the retina of the eye? |
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Answer» What are the properties of image formed on the retina of the eye? |
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| 24. |
A moving coil galvanometer shows deflection of 100 divisions when 20 mA current is passed through it. If the resistance of the galvanometer coil is 50 ohm , find the voltage sensitivity of galvanometer |
| Answer» A moving coil galvanometer shows deflection of 100 divisions when 20 mA current is passed through it. If the resistance of the galvanometer coil is 50 ohm , find the voltage sensitivity of galvanometer | |
| 25. |
The heat generated in a wire depends upon the resistance , current & time . If the error in measuring the above are 1% ,2% & 1% respectively . What is the maximum error in measuring the heat ? |
| Answer» The heat generated in a wire depends upon the resistance , current & time . If the error in measuring the above are 1% ,2% & 1% respectively . What is the maximum error in measuring the heat ? | |
| 26. |
List four properties of the image formed by a convex mirror when object is placed between focus and pole of the mirror. |
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Answer» List four properties of the image formed by a convex mirror when object is placed between focus and pole of the mirror. |
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| 27. |
In power generators, three armature coils are arranged around the field magnet at an angular separation of ____ |
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Answer» In power generators, three armature coils are arranged around the field magnet at an angular separation of ____ |
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| 28. |
State the correct sequence(1-7) of colours in the spectrum formed by prism A and prism B. |
Answer» State the correct sequence(1-7) of colours in the spectrum formed by prism A and prism B. |
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| 29. |
A lens of focal length 20 cm is used to produce a ten times magnified image of a flim slide on a screen. How far must the slide be placed from the lens? |
| Answer» A lens of focal length 20 cm is used to produce a ten times magnified image of a flim slide on a screen. How far must the slide be placed from the lens? | |
| 30. |
A man driving a car can read a distant road sign clearly but finds difficulty in reading the odometer on the dashboard of the car. Which of the following statement is correct about this man ? (a) The near point of his eyes has receded away. (b) The near point of his eyes has come closer to him. (c) The far point of his eyes has receded away. (d) The far point of his eyes has come closer to him. |
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Answer» A man driving a car can read a distant road sign clearly but finds difficulty in reading the odometer on the dashboard of the car. Which of the following statement is correct about this man ? (a) The near point of his eyes has receded away. (b) The near point of his eyes has come closer to him. (c) The far point of his eyes has receded away. (d) The far point of his eyes has come closer to him. |
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| 31. |
5. What is Oxymercuration? What is its its mechanism? |
| Answer» 5. What is Oxymercuration? What is its its mechanism? | |
| 32. |
At what depth from the surface of earth, the time period of a simple pendulum is 0.5% more than that on the surface of the earth?(Radius of earth is 6400 km) |
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Answer» At what depth from the surface of earth, the time period of a simple pendulum is 0.5% more than that on the surface of the earth? |
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| 33. |
Some hot water was added to three times its mass of cold water at 100C and the resulting temperature was found to be 200C. What was the temperature of the hot water? |
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Answer» Some hot water was added to three times its mass of cold water at 100C and the resulting temperature was found to be 200C. What was the temperature of the hot water? |
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| 34. |
A small object is so placed in front of a convex lens of 5cm focal length that a virtual image is formed at a distance of 25 cm . Find the magnification |
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Answer» A small object is so placed in front of a convex lens of 5cm focal length that a virtual image is formed at a distance of 25 cm . Find the magnification |
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| 35. |
Kα wavelength emitted by an atom of atomic number Z=11 is λ. Find the atomic number for an atom that emits Kα radiation with wavelength 4λ. |
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Answer» Kα wavelength emitted by an atom of atomic number Z=11 is λ. Find the atomic number for an atom that emits Kα radiation with wavelength 4λ. |
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| 36. |
Name the physical quantity which is measured in calorie.How is it related to the S.I. unit of that quantity? |
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Answer» Name the physical quantity which is measured in calorie.How is it related to the S.I. unit of that quantity? |
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| 37. |
Why bar magnets always attract objects made of iron,cobalt and nickel rather than gold,silver? |
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Answer» Why bar magnets always attract objects made of iron,cobalt and nickel rather than gold,silver? |
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| 38. |
what is valence band and conduction band? |
| Answer» what is valence band and conduction band? | |
| 39. |
Observe the following table:Name of the elementSymbolNumber of protonsNumber of neutronsNumber of electronsOxygenO888SulphurS161616With the help of table, find out the mass number of oxygen and sulphur atom. |
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Answer» Observe the following table: Name of the elementSymbolNumber of protonsNumber of neutronsNumber of electronsOxygenO888SulphurS161616 With the help of table, find out the mass number of oxygen and sulphur atom. |
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| 40. |
List four ways in which we can conserve water. |
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Answer» List four ways in which we can conserve water. |
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| 41. |
State four ways in which machines are useful to us. |
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Answer» State four ways in which machines are useful to us. |
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| 42. |
If atmospheric electric field is approximately150 volt/m and radius of the earth is 6400 km,then the total charge on the earth's surface is |
| Answer» If atmospheric electric field is approximately150 volt/m and radius of the earth is 6400 km,then the total charge on the earth's surface is | |
| 43. |
The radius of a circular loop is 0.4m and the current is 12A. What is the magnitude of the magnetic field at the centre of the loop? |
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Answer» The radius of a circular loop is 0.4m and the current is 12A. What is the magnitude of the magnetic field at the centre of the loop? |
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| 44. |
Find the equivalent resistance between A & B in the given circuit. |
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Answer» Find the equivalent resistance between A & B in the given circuit.
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| 45. |
Prove that time of ascent is equal to time of descent. Neglect all other forces except gravity |
| Answer» Prove that time of ascent is equal to time of descent. Neglect all other forces except gravity | |
| 46. |
A bulb is connected to a battery of p.d. 4 V and internal resistance 2.5 Ω. A steady current of 0.5 A flows through the circuit. Calculate : (i) the total energy supplied by the battery in 10 minutes, (ii) the resistance of the bulb, and (iii) the energy dissipated in the bulb in 10 minutes. |
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Answer» A bulb is connected to a battery of p.d. 4 V and internal resistance 2.5 Ω. A steady current of 0.5 A flows through the circuit. Calculate : (i) the total energy supplied by the battery in 10 minutes, (ii) the resistance of the bulb, and (iii) the energy dissipated in the bulb in 10 minutes. |
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| 47. |
The strain energy stored in the bar subjected to loads as shown in figure will be:(AE is constant) |
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Answer» The strain energy stored in the bar subjected to loads as shown in figure will be: |
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| 48. |
The current in the windings on a toroid is 2 AThere are 400 turns and the mean radius is 40cm. If the magnetic field inside is 1 T, the relativepermeability is near to(1) 2000(3) 1000(2) 2500(4) 1500 |
| Answer» The current in the windings on a toroid is 2 AThere are 400 turns and the mean radius is 40cm. If the magnetic field inside is 1 T, the relativepermeability is near to(1) 2000(3) 1000(2) 2500(4) 1500 | |
| 49. |
Two similar equal charges are found to repel each other with a force of 16 N when placed 0.3 m apart in air. What is the strength of each charge? What will be the force between them if the space between them is filled with a substance of dielectric constant 8? |
| Answer» Two similar equal charges are found to repel each other with a force of 16 N when placed 0.3 m apart in air. What is the strength of each charge? What will be the force between them if the space between them is filled with a substance of dielectric constant 8? | |
| 50. |
ntQ.3n ntA water sample contains 9.5% MgCl2and 11.7% NaCl (by weight). Assuming 80% ionisation of each salt. Boiling point of water will be approximately (Kb= 0.52)n |
| Answer» ntQ.3n ntA water sample contains 9.5% MgCl2and 11.7% NaCl (by weight). Assuming 80% ionisation of each salt. Boiling point of water will be approximately (Kb= 0.52)n | |
