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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. |
Sound travels at 1500 m/s in water. How deep is an ocean if the echo from a transmitter takes 4 s to reach the receiver? |
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Answer» Explanation: given, v=1500m/s t= 4s freq.= 0.25 wavelength = velocity/time= 1500/4 = 375, wave travels twice of DISTANCE then answer is 375 ×2 |
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| 3. |
Relation between si and cgs unit of magnetic flux |
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Answer» Answer: Magnetic flux is the PRODUCT of magnetic FIELD and area. As SI UNIT of magnetic flux is weber, so 1Wb=Tesla(T)×m2 where 1T=104gauss and 1m2=104cm2 (T and gauss is the SI and CGS unit of magnetic field ) So, 1Wb=104gauss×104cm2=108 maxwell |
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| 4. |
A fuse wire is always introduced into live wire is called |
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Answer» Answer: okkk Explanation: The FUSE is always CONNECTED in the LIFE wire of the circuit because if the fuse is put in the neutral wire then due to excessive FLOW of current when the fuse burns current stop FLOWING in the circuit but the appliances remain connected to the higher potential point of the supplied through the live wire now if a .. if you like my answer than follow me |
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| 5. |
Induced electric field is when conservative and when non conservative? To be brainliest answer it properly |
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| 6. |
R.M.S value of nitrogen at N.T.P |
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Answer» The R.M.S. velocity of NITROGEN molecules at N.T.P. is 497 m/s. plz MARK BRAINLIEST. . FOLLOW for every answer |
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| 7. |
Solve it.. Complete the following table: |
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Answer» YR FORMULAE me rakhkar KAR lena DENSITY= Mass/Volume |
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| 8. |
How are the states of rest and motion relative? |
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Answer» Explanation: Rest and motion are the relative TERMS because they depend on the observer's frame of REFERENCE. ... So if TWO different observers are not at rest with respect to each other, then they too get different results when they observe the motion or rest of a body plz mark brainliest. . follow for EVERY answer |
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| 9. |
Which of the following are not a unit of time?(a) Second(b) Parsec(c) Year(d) Light year |
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Answer» parsec |
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| 10. |
How many ampere of current is called power? |
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Answer» Answer: 2×10-7. NEWTON's |
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| 11. |
Give some of the uses or areas where solar cell / panels are being used. |
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Answer» Renewable ENERGY - The energy can be USED both to generate electricity and HEAT in the house. Renewable energy is RECOVERED from the sun, the wind and waves - which in this case is the sun. Solar cells HARNESS the energy from the sun and transform this into usable electricity. |
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| 12. |
a force of 10kg weight acting on a object of mass for 2 second gives a velocity of 10m/s.what is the mass of an object in kilogram |
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Answer» HOPE it helps |
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| 13. |
From grid station electricity supplied at which voltage |
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Answer» Answer: Hello my friend Explanation: Most modern North AMERICAN homes are wired to receive 240 volts from the TRANSFORMER, and through the USE of split-phase electrical power, can have both 120 volt receptacles and 240 volt receptacles. The 120 volts is typically used for lighting and most WALL OUTLETS. |
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| 14. |
Two iron rods have their lengths in the ratio 5 : 3 and diameters in the ratio 2 : 1. When the rods are heated from 30°C30°C to 100°C100°C, the ratio of their linear expansions is |
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Answer» HLO...................... |
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| 15. |
Is the value of resistance are same for all objects |
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Answer» no it is not as their are MATERIALS who's properties are different plz MARK brainliest |
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| 17. |
The rate at which electric energy is consumed in an electric circuit is' |
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Answer» Electric power is the rate, per unit time, at which ELECTRICAL energy is transferred by an electric CIRCUIT. The SI unit of power is the WATT, ONE joule per second. |
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| 18. |
The current produced in a circuit by rotation of a coil in a strong magnetic field is called |
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Answer» Answer: Hello my friend Explanation: Electromagnets Devices with Electromagnets An electromagnet is a coil of wire wrapped around a bar of iron or other ferromagnetic material. When electric current flows through the wire, it CAUSES the coil and iron bar to become magnetized. An electromagnet has north and south magnetic POLES and a magnetic FIELD. |
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| 19. |
A current of 1/4pie amp is flowing in a long straight conductor. The line integral of magnetic inductionaround a closed path enclosing the current carrying conductor is) 10-7 webre/metre2) 411x10-7 webre/metre3) 1672x10-7 webre/metre4) zero |
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Answer» ∮B⋅dl=μ0I =4π×10−7×4π1 =10−7Wbm−1 |
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| 20. |
two charges of magnitude 5nC and -2nC are placed at points (2,0,0) and (x,0,0) in a region of space where there is no external field . If electrostatic potential of the system is -0.5 j ,find the value of x |
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Answer» Explanation: For a square ABCD, OA=OB=OC=OD=r As charge 5μC is placed on CENTER O so EVERY point A,B,C and D have same POTENTIAL V=5k/r. Thus potential difference (dV) between A and B will be zero. Work done W=qdV=1(0)=0 solution |
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| 21. |
A ray of light incident ray on the surface of a medium at an angle 45° and is refracted in the medium at an angle 30° . what is the velocity of light in the medium? |
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Answer» Explanation: REFRACTIVE INDEX, n=sinrsini=vc Hence, SPEED of sound in the medium v=sinicsinr=sin45∘3×108×sin30∘ v=23×108m/s v=2.12×108m/s |
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| 22. |
Solve the numerical and find significant figures in solution 0.256*2.582/0.0056 |
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| 23. |
The electric field ata a point on the axial line is 10cm |
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Answer» Answer: Explanation: The ELECTRIC field at a point on the axial LINE at a distance of 10 CM from the centre of an electric dipole is 3.75 * 10-5 N/C in air ,while at a distance of 20cm, the electric field is 3* 10⁴ N/c. |
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| 24. |
17. An alpha particle is placed in an electric field of 15 x 10^4NC^-1. Calculate the force on the particleAns. 4.8 x 10^-14N |
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Answer» Given that , Charge (q) = 2e = 3.2 × (10)^-19 C ELECTRIC FIELD (E) = 15 x 10^4 N/c As we KNOW that , The electric FORCE per unit charge is called electric field Mathematically , The SI unit of electric field is N/c Thus , F = 15 x 10^4 × 3.2 × (10)^-19 F = 48 × (10)^-15 F = 4.8 × (10)^-14 N |
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| 25. |
What are the three things that food does for us |
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Answer» Answer: Energy,GROWTH,WARMNESS,Recoveries HOPE THAT HELPS PLEASE MARK MY ANSWER AS BRAINLIEST... |
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| 26. |
Mass of 112ml of a certain gas is 0.22 g at STP .how many molecules are there in the sample of gas |
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| 27. |
Differences between bar and permanent magnet. |
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Answer» Difference between Permanent Magnet and Electromagnet Permanent (BAR) Magnet Electromagnet 1. They are permanently magnetized. 1. These are temporarily magnetized. 2These are usually made of hard materials. 2They are usually made of soft materials. 3The strength of the MAGNETIC field LINE is constant i.e. it cannot be varied. 3 The strength of the magnetic field lines can be varied according to our need. 4 The poles of a Permanent magnet cannot be changed. 4The poles of an electromagnet can be altered. 5 Example of a permanent magnet is a Bar Magnet 5Example of a temporary magnet is solenoid wounded across a NAIL and connected to a battery. plz mark me the brainliest |
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| 28. |
an object 3 cm high is placed 20cm from convex lens of focal lenght 12 cm. find the nature,position,magnification and height of the image. |
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Answer» An object 3 cm high is placed 20CM from convex lens of focal lenght 12 cm. We have to find the nature, position, magnification and HEIGHT of the image. From above data we have; height of object (h) is 3 cm, object distance (u) is -20 cm and focal length (f) is 12 cm. USING lens formula: 1/f = 1/v - 1/u Substitute the values in the above formula, → 1/12 = 1/v - 1/(-20) → 1/12 = 1/v + 1/20 → 1/12 - 1/20 = 1/v → (5 - 3)/60 = 1/v → 1/30 = 1/v → 30 = v Therefore, the image distance from the lens is 30 cm. Using Magnification formula: m = v/u Substitute the values, → m = 30/(-20) → m = -1.5 Also, m = h'/h → -1.5 = h'/3 → -4.5 = h' So, the height of the image is 4.5 cm. Nature of the image: Image is real, INVERTED and larger than the object. |
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| 29. |
an object is lying at rest and a force of 20 newton is applied on it for 15 seconds . What is the momentum of the object? |
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Answer» Answer: 300 NEWTON seconds Explanation: Above ATTACHMENT |
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| 30. |
[By using safety fuse a. Short circuit can be prevented. b. Overloading can be prevented. c. Both short circuit and overload can be prevented] |
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Answer» Answer: c Explanation: both short circuit and overloading can be PREVENTED because a fuse will cut off the SUPPLY as soon as the amount of CURRENT exceeds the capacity of the fuse by MELTING as a fuse is an ALLOY of lead and tin and alloys have a fixed melting point |
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| 31. |
Find the dimensions of ( × ) in equation E = 2−2 , where E is energy, is distance and is time. |
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Answer» EXPLANATION:SORRY i DONT have this answer
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| 32. |
What are examples of linear motion |
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Answer» Answer: EXAMPLES of linear motion are 1) RUNNING on a straight path 2) SWIMMING in a straight path pool 3) Driving on a straight road Explanation: linear motion is motion ALONG a straight path. Hope this HELPS:) |
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| 33. |
If the image formed by a mirror for all positionsof the object placed in front of it is always diminished, erect and virtual,(a) Name the type of the mirror. (b) Position of the object with respect to thepole of the mirror(c) Draw a ray diagram to justify your answer. |
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Answer» Answer: The image formed by a mirror for all positions of the object placed in front of the mirror is the convex mirror.In which image always form diminished, erect and virtual. Here the ray of light is coming from distant and making the image between the P and F. The CONCAVE mirror is USED in front light of cars to reflect the light. (b) Radius of curvature: The radius of curvature of a spherical mirror is defined as the radius of the ORIGINAL sphere from which the mirror is belonged from.This is distant from the pole of the mirror and the centre of the spherical shell. |
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| 34. |
A man was driving a 1800kg car at the speed of 35m/s .when he reached near school,he slowed down his car to 15m/s.what was the change in the kinetic energy of the car? |
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Answer» Explanation: change in KE = KEF - KEi = I/2*1800*(15²-35²) J = 900*(225-1225) J = 900*-1000 J = -900000 JOULES |
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| 35. |
one aeroplane Travels due north at 300 km/h and another aeroplane Travels due south at 300 km/h Are their Speed the same? Are their velocities the same |
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Answer» their speed is same but velocity is not same because velocity means speed with DIRECTION but they have DIFFERENT DIRECTIONS |
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| 36. |
Determine the unit of 'R' from dimensional analysis |
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Answer» Explanation: Electric resistance=potential difference/current => work done/charge/current work done=[ML^2T^-2] charge=[AT] current=[A] => [ML^2T^-2]/[AT]/[A] => [ML^2T^-3A^-2] HOPE THIS HELPS |
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| 37. |
Please paper pe solve kardo . screen pe solve mat karna |
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Answer» if my ANSWER benefites you the you have to MAKE me BRAINLIEST and PLEASE FOLLOW me. |
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| 38. |
Find the density of an oject whose mass is 2000g andvolume is 50cm cube |
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Answer» Answer:
The answer is 40 cm³ DENSITY is MASS in grams over volume in cubic centimeters. So it is :- 2000g/50cm³ = 40cm³
The unit is grams per cubic centimeter. NB - density can also be kilograms over cubic meters Explanation:
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| 39. |
What do you mean by the term sister fugly |
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Answer» BDW Outsacvnki Ddfbku GFSZVNJO visarjit vsadgioncs |
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| 40. |
For the same mass of two different materials the volume is? |
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Answer» Answer: It depends how you measure the volume and how “same” the materials are and on outside pressures. A perfect solid sphere of say iron would have a smaller volume than a hollow sphere with a 2cm wall, if you use it's outer dimensions. But the amount of material would be the same so it is the same volume of iron. A given mass of air in a balloon would have the same volume as another unless one is heated or chilled. Or placed underwater. Heat expands the gases cold contracts them, and the pressure of the water would squeeze the air molecules closer together. Same with liquified air same mass MUCH lesser volume. Water and heavy water are basically the same on a molecular level but when you look at the atoms one is heavier because of the extra NEUTRON. So the heavy water would take up less volume for the same mass. If you are measuring two identical materials at the same temperature and pressure they will have the same volumes. We can make THINGS look like they have more volume (hollow sphere) but if you melted both spheres down they would fill the same amount of space. I HOPE THIS HELPS YOU PLEASE MARK ME AS BRAINLIEST ANSWER. |
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| 41. |
What is meant by magnetic effects of induced current |
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Answer» Answer: HEY laukikjain 9284,here's your answer. Explanation: The changing magnetic field CAUSED by the MATERIAL's motion INDUCES a current in the coil of wire proportional to the change in field. If a 0 is represented, the magnetic field does not change between the two domains of a bit, so no current is induced as the magnetic material passes the coil. ❤Hope it helps you.❤ |
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| 42. |
Describe principal axis of convex mirrors |
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Answer» Answer: 1. they can never create a REAL image 2. they can never create an image larger than the object; and, 3. the image gets larger as the object gets closer
The image STARTS at infinitely small height. and located at the focal point, hen the object is at "infinity." Then, as the object approaches the surface of the mirror, the image does, too; and grows in size until -- when the object is right in front of the mirror -- the image is basically the same size as the object and "just inside" the surface of the mirror. This is because, when the object is that CLOSE, the convex mirror looks a lot like a plane mirror, which would just produce an equal-sized virtual image the same DISTANCE on the other side of the mirror surface from the object. The same thing is TRUE for an object right next to a concave mirror. That also produces an equal-sized virtual image right on the other side of the mirror, because, that close, the concave mirror looks basically like a plane mirror, as well.
So, for part b, I would say the ray diagram must be incorrect somehow, because of overriding principle 2.
When locating an image with a ray diagram, I usually rely on two chief rays:
1. A ray that comes in parallel to the optical axis, which then reflects off the mirror so that it looks like it come from the principal focal point, which is inside a convex mirror 2. A ray that reflects at the point where the optical axis intersects the mirror surface. That ray just reflects around the axis as it would off a plane mirror (so that its incident angle with respect to the axis is the same as its reflected angle with respect to the axis). |
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| 43. |
(a) Which type of motion is represented by the velocity-time graph shown below |
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Answer» Answer: there is no graph visible if the line is parrallel to the x-axis the it will be called as UNIFORM velocity and if the line is like a straight SLOPE then it will be uniform acclaration |
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| 44. |
A vector having magnitude of 10 units lying on X-axis .the value of component is?? |
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Answer» y=0...... |
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| 45. |
Why does dust flies off when a carpet is hit with stick? |
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Answer» Answer: please ADD to brainlist Explanation: when a carpet is beaten with a stick the dust comes out of it because of law of INTERIA.intially the dust particles are rest ALONG with the carpet beating the carpet with stick makes carpet move but the dust particles remain at rest DUE to interia at rest,thus the dust gets detached from the carpet |
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| 46. |
We can absool ink asing DONOof Chalk// اري) |
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Answer» najajamakaiakajsi a anajjsjmmsm Explanation: we can absool INK asing DONO of CHALK // اري) |
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| 48. |
The coefficient of friction between a body and ground is 1/√3 then(A) The angle of friction can vary from 60to 90(B) The angle of friction can vary from 0to 30(C) The angle of friction can vary from 0to 60(D) The angle of friction can be vary from 30 to 90(p.s the answer is part B) i need the explanation ) Don't answer if you don't know ❌❌❌ I request no spammers please ❌❌❌The correct explanation will be marked brainliest and i will for him/her ❗❗ |
Answer» (A) The ANGLE of FRICTION can VARY from 60to 90 |
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| 49. |
An object having a mass 'm' moving with velocity 'v' possess a kinetic energy 'k'.if its velocity is doubled, it's kinetic energy will become |
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Answer» Answer: ...will become 4 TIMES Explanation: Let the INITIAL KINETIC energy be Here velocity(v) is doubled so it BECAME 2v. Putting 2v instead of v will represent the velocity is doubled. Now we can clearly see that if the velocity become twice its original value, the final kinetic energy will become 4 times the original. |
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| 50. |
Write the short note on the earth’s gravitational force. |
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Answer» Answer: The gravitational force is a force that attracts any OBJECTS with mass. You, right now, are PULLING on every other object in the entire universe! This is CALLED Newton's Universal Law of Gravitation. ... And if you triple the DISTANCE between two objects, you REDUCE the force to a ninth. Explanation: Please mark me as brainest and follow me |
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