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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. |
Describe hydrogen power? |
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Answer» Answer: HYDROGEN fuel cells produce electricity by combining hydrogen and OXYGEN atoms. The hydrogen reacts with oxygen across an electrochemical CELL similar to that of a battery to produce electricity, water, and SMALL amounts of heat. Many different TYPES of fuel cells are available for a wide range of applications. |
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| 2. |
An object of mass 2 kg is sliding with a constant velocity of 4 ms -1 on a frictionless horizontal table. The force required to keep the object moving with same velocity is (a) 2 N (b) 8 N (c) 32 N (d) 0 NAn object of mass 2 kg is sliding with a constant velocity of 4 ms -1 on a frictionless horizontal table. The force required to keep the object moving with same velocity is (a) 2 N (b) 8 N (c) 32 N (d) 0 N |
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| 3. |
1.A stone is thrown vertically upwards with avelocity of 4.9 ms. Calculate (i) the maximumheight reached (ii) the time taken to reach themaximum height (iii) the velocity with which itreturns to the ground and (iv) the time taken toreach the ground. |
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| 4. |
Pls answerwhat is the difference between mass and weight4 markspls give correct answer |
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Answer» Answer: The difference between mass and weight We often use the words ‘mass’ and ‘weight’ interchangeably, but they mean quite different things. Your mass is the same no matter where you go in the universe; your weight, on the other hand, changes from place to place. Mass is measured in kilograms; even THOUGH we usually talk about weight in kilograms, strictly speaking it should be measured in newtons, the units of force. Mass is a measurement of an object’s tendency to resist changing its state of motion, known as inertia. Left to its own devices, an object will stay put or MOVE in a straight line – think of a puck on an air hockey table. Unless some force – like friction, or banging into a wall – acts on the puck, it will keep sliding on the same path forever. Mass is a measure of how much force it will take to change that path. Mass depends on how much matter – atoms and so on – there is in an object; more mass means more inertia, as there is more to get moving. (This is Isaac Newton’s idea of mass, which underpins his famous LAWS of motion developed in the late 1600s. It is not quite accurate at extremely high speeds, where Albert Einstein’s 20th-century theory of special relativity is required, but it’s fine for most everyday situations.) Weight, on the other hand, is a measure of the amount of downwards force that gravity exerts on an object. This force increases with the object’s mass: the more inertia it has, the harder gravity pulls. On Earth’s surface, the force of gravity is about 9.8 newtons per kilogram. It’s only because we are used to dealing with conditions on the surface of Earth that we use often use ‘mass’ and ‘weight’ interchangeably. When we say someone weighs 70 kilos, we really mean their mass – their weight would be 70 * 9.8 = 686 newtons. (This force – 686 newtons – is actually what bathroom scales are measuring. They convert it into kilograms for convenience.) On the surface of the MOON, where the force of gravity is weaker (about a sixth Earth’s gravity, or 1.6 newtons per kilogram), a 70-kilogram astronaut would weigh only 112 newtons. This is about what an 11.5-kg object would weigh on Earth. Even on the International Space Station, where astronauts are weightless, they still have mass: they must still exert force to push themselves off the walls or pull themselves along, and the bigger they are the more force it will take. So a trip to space might be a quick way to LOSE weight, but losing mass is another matter. HOPE IT IS HELPFUL TO YOU . I THINK IT IS OK IN 4 MARKS QUE . THANKU . |
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| 5. |
91.A small square loop of wire of side l is placedinside a large square loop of wire side L (>>I). Theloops are coplanar and their centres coincide.What is the mutual inductance of the system?a) 2/2 10 1²b) 877 Mo 12a LπLܬܵܐ1²c) 24/7 Ho ??d) 2VZHOL?21 Lal |
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| 6. |
Nessecity of callibration graph of ammeter and wattmeter. |
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Answer» |
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| 7. |
Keplers law chapter 5 11th |
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Answer» Answer: Three Kepler's law :: 1) The path in which planet revolves is elliptical and the sun is at ONE of the FOCII of the ellipse 2)dA/dt = L/2m where A= area , L = angular momentum 3) T² is DIRECTLY PROPORTIONAL to r³ where T is the time period of revolution |
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| 8. |
Draw the neat diagram depicting hypermetropia and its rectification. |
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| 9. |
*find dimension of T = 21./m/k |
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Answer» sorry |
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| 10. |
1.The image formed by a concave mirror is observed to be virtual, erect and larger than the objeci. Whereshould be the position of the object?(A) Between the principal focus and the centre of curvature(B)At the centre of curvature(C) Beyond the centre of curvature(D) Between the pole of the mirror and its principal focus. |
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Answer» The image formed by a CONCAVE mirror is OBSERVED to be virtual, erect and LARGER than the OBJECI. Where should be the position of the object? (A) Between the principal focus and the centre of CURVATURE (B)At the centre of curvature (C) Beyond the centre of curvature (D) Between the pole of the mirror and its principal focus. (D) Between the pole of the mirror and its principal focus. |
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| 11. |
.We measure the period of oscillation of a simple pendulum. The readings are 2.63s, 2.56s, 2.42s and 2.71s. thepercentage error in measurement is a. 10% b. 4% c. 6% d. 11% |
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Answer» We measure the PERIOD of OSCILLATION of a simple PENDULUM. The readings are 2.63s, 2.56s, 2.42s and 2.71s. the percentage ERROR in measurement is b) 4% |
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| 12. |
A_ or a_ can orient itself in a magnetic field |
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Answer» Answer: The magnetic positive field or the north pole is located in the artic AREA. ... Any magnet which is free to ROTATE if suspended on the SURFACE of the EARTH will allign itself with the magnetic field of the earth. And that's how the bar magnet orient itself relative to this planet's magnetic field |
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| 13. |
Derive an expression for time period of a simplependulum. It mplitude of osillation of a simplependulum (an osillators) becomes double how itدو )efects.☺) Period of osiliation(1) Maximum of velocity(1) Total energy of oscillators.Justify your ans in each case |
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Answer» jo.i.n GIRLS ❤️❤️ pxr-xzxr-dzr |
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| 14. |
Is the derivation of the three equations of motion possible without graphical method?If yes, then please show me the Derivation of the 1st equation of motion |
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| 15. |
Want the answer with the steps |
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Answer» Answer: it is out of syllabus for me |
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| 16. |
In a car lift, compressed air exerts a force on a piston with a radius of 5.00 cm.This pressure is transmitted to a second piston with a radius of 15.0 cm.a. How large a force must the compressed air exert to lift a 1.33 × 104 N car?b. What pressure produces this force? Neglect the weight of the pistons. |
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Answer» Answer: 2The PROCESS of deriving large crystals of PURE substances from their solutions is known as crystallisation. It is a physical change. Crystals of salt are obtained by the EVAPORATION of SEA WATER. ... This mixture when filtered and allowed to cool produces crystals of copper sulphate. |
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| 17. |
Brief explain observables and operators |
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Answer» Answer: OBSERVATION: Observation is the active acquisition of information from a primary source. In living beings, observation employs the senses. In SCIENCE, observation can also involve the perception and recording of data via the USE of scientific instruments. The term may also REFER to any data collected during the scientific activity. OPERATORS: In mathematics and sometimes in computer programming, an OPERATOR is a character that represents an action, as for example x is an arithmetic operator that represents multiplication. In computer programs, one of the most familiar sets of operators, the Boolean operators, is used to work with true/false values. |
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| 18. |
What is the energy rewuired to build up a current of 1 A in an inductor of 20 MHPa) 10 MJ b) 20 MJc) 20J d) 10 J |
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| 19. |
Distinguish between zener diode and rectifier diode using multimeter? please answer |
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Answer» Answer: Although they are both called diodes they have very different uses. ... In this circuit they have used a 5.1V zener DIODE, if you were to use a multimeter across Vout then you would measure 5.1V, all the other voltage is dropped across the other COMPONENTS in the circuit, in this case a 1K resistor. Explanation: PLS mark as BRAINLIEST answer |
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| 20. |
Q.4) SAFEFind the angularmomentum of a body of mass 200gm attach to string of length 4 mrevolve in horizontal Circle if thestring break under tension of 40 kgof weight. WORKING LOAD (SWL) |
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Answer» A CERTAIN string breaks under a tension of 45kgwt. A mass of 100g is attached to this string of length 500cm and whirled in a horizontal circle. Find the MAXIMUM number of revolutions per second without breaking the string. Explanation: As given that breaking tension of string is 45kgwt=45×10N=450N so the tension in the string when we ROTATE the mass should be less than 450N ⇒T≥mω 2 R ⇒ω≤ mR T
given that m=0.1kg, R=5m ⇒ω≤ 0.1×5 450
⇒ω≤ 900
⇒ω≤30rad/s as we know r.p.s.(REVOLUTION per sec)×2π=ω ⇒r.p.s.= 2π ω
= 2π 30
=4.729 |
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| 21. |
What happens to an electrolyte during electrolysis |
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Answer» The ions MUST be FREE to move, which is possible when an ionic substance is dissolved in water or it is melted. ... Negatively charged ions move to the POSITIVE electrode during electrolysis. They lose electrons and are oxidised . The substance that is broken down is called the ELECTROLYTE. |
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| 22. |
36. a) What are speed-time graphs?b) Derive the velocity-time, position-time and position-velocity relations from the speed-time graphs. |
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Answer» Answer: a) The speed-time graph below ILLUSTRATES how the speed of an object changes with time. A HORIZONTAL LINE on a speed-time graph represents a steady speed. This can also be CALLED a constant or UNIFORM speed. A sloping line on a speed-time graph represents an acceleration . |
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| 23. |
Calculate mass of 0.5 mole of Aluminium oxid |
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Answer» Answer: The Sangh was FORMED after a struggle under the leadership of the Kisan Adivasi Sangathan, in response to which the STATE GOVERNMENT accorded exclusive fishing rights to a COOPERATIVE of displaced fishermen. The federation of these cooperatives CAME to be known as the Tawa Matsya Sangh. |
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| 24. |
Find the angle between two plane mirrors if the number of images formed are 11 |
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Answer» Answer: The formula to find the number of IMAGES between two MIRRORS inclined at theta deg to each other is 360/theta - 1 = 11, or,360/theta = 12, or,theta = 360/12 = 30 deg. The two mirrors are inclined at 30 deg to each other. |
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| 25. |
if a man of 75 kg climbs the stairs up to a vertical height of 6m . how much potential energy is stored in his body |
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Answer» I'd KNOW Explanation: |
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| 26. |
Define momentum????? |
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Answer» <P>Answer: Momentum can be defined as "MASS in motion." All objects have mass; so if an object is moving, then it has momentum - it has its mass in motion. The amount of momentum that an object has is dependent upon two variables: how MUCH stuff is moving and how fast the stuff is moving. Momentum depends upon the variables mass and velocity. In terms of an equation, the momentum of an object is equal to the mass of the object times the velocity of the object. Momentum = mass • velocity In physics, the symbol for the quantity momentum is the lower case p. THUS, the above equation can be rewritten as p = m • V where m is the mass and v is the velocity. The equation illustrates that momentum is directly proportional to an object's mass and directly proportional to the object's velocity. The units for momentum would be mass units times velocity units. The standard metric unit of momentum is the kg•m/s. While the kg•m/s is the standard metric unit of momentum, there are a variety of other units that are acceptable (though not conventional) units of momentum. Examples include kg•mi/hr, kg•km/hr, and g•cm/s. In each of these examples, a mass unit is multiplied by a velocity unit to provide a momentum unit. This is consistent with the equation for momentum. |
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| 27. |
If force of 10 n is applied on a body of mass 2 kg. find the displacement produced |
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Answer» Given : F = 10 N m = 2 kg t = 2 s u = 0 m/sAcceleration of the BODY a = Fm = 102 = 5 m/s^2 Using S = UT + 12at^2 Distance TRAVELED in 2 s, S = 0 + 12 . |
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| 28. |
Coefficient of volume expansion at constant pressurefor an ideal gas at 300 K is1.5x 10-3K-13.3 x 10-3K-12.7 x 10-5k3.3 * 10-5 K-1 |
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Answer» sghsjsejjdhdjdjejejdjdjdjjdjdjnddnddnsnaanj |
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| 29. |
23.(a) Two bodies of equal masses move with uniform velocities v and 3v respectively. Find the ratio oftheir kinetic energies. (b) On what factors does kinetic energy of a body depend? (c) A bullet of mass 10 g is fired with a velocity of 80m/s.What is its kinetic energy? |
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Answer» INVALID expression I HOPE this is help you Please FOLLOW me |
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| 30. |
Describe the working of an electric fuse. in 30 and 40 words |
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Answer» An electric fuse is based on the principle of heating effect of electric current. It is made up of thin METALLIC wire of non-combustible material. ... When an excessive current flows in the circuit, it generates heat in the circuit which leads to melt the fuse due to its low melting point, and it ALSO OPENS the circuit. Explanation: Have A Nice |
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| 31. |
If e is the cocfficient of restitutionthen which one of the following conditionsa perfectly elastic colisiomn |
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Answer» Answer: The coefficient of restitution (COR), also DENOTED by (e), is the ratio of the final to initial relative velocity between TWO objects after they collide. It NORMALLY ranges from 0 to 1 where 1 would be a perfectly ELASTIC collision. |
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| 32. |
Diamond and Si have a band gap of ~5eV and 1.12 eV, respectively.(i) Find the temperature at which the resistance of diamond will be equal to that of Silicon at 300K, i.e. (300) = (). (Assume that the value of C0 is the same for both the materials) |
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Answer» +hejhehh Explanation: DEAR Parents, |
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| 33. |
What is the relationship betweenthe polarizing angle and thecritical angle? Two polaroidsA and B are in crossed position.Unpolarised light of intensity64 Wmis incident on thepolaroid A. Calculate the intensityof the transmitted light from thecombined polaroids by rotatingpolaroid B by an angle of 30°. |
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Answer» Answer: POLARIZING ANGLE is defined as an angle of incidence at which LIGHT with a particular polarization is perfectly TRANSMITTED through a transparent dielectric surface. In optics, the smallest angle of incidence that causes total internal REFLECTION of light is known as Critical angle. Explanation: I hope it will help you with |
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| 34. |
37. Five resistances of10Ω, 20Ω, 20 Ω, 40Ω, and 50Ω areconnected as shown in figure. Theequivalent resistance betweenpoints A and B is |
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Answer» Answer: Please GIVE me 5 Star for motivate me to solve more QUESTIONS. |
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| 35. |
What are essential requirements for an ac generator |
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Answer» your answer is HOPEFULLY IT HELPS |
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| 36. |
The power of a combination two lens X and Y is 5D, if the focal length of lens X is 15cm. State the nature of focal length of lens Y. |
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Answer» Y is 5 D,if the focal length X is15 cm the NATURE of focal length of LENS Y |
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| 37. |
What is the cause of dispersion |
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Answer» Dispersion occurs due to the different degrees of REFRACTION EXPERIENCED by different colours of light. Light of different colours MAY travel with the same speed in a vacuum, but they travel at different speeds in some refracting MEDIUM. The speed of violet light is relatively lower than that of red light. Therefore, the refractive index of the medium is largest for violet light and the refractive index is least for red light (in the visible spectrum). As a result, the refraction or bending of violet coloured light is the maximum and that of red coloured light is minimum. This difference in the extent of bending of different colours of light results in the dispersion of WHITE light into its constituent colours as they emerge from a prism. Hope it will help uhh!! ☺ |
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| 38. |
Two sources of sound are separated bya distance 4 m. They both emit soundwith the same amplitude and frequency(330 Hz), but they are 180° out of phase.At what points between the two sources,will the sound intensity be maximum?[Ans: +0.25, 0.75, +1.25 and1.75 m from the point at the center] |
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Answer» Answer: |
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| 40. |
ਅਭਿਨਵ ਬਿੰਦਰਾ ਦੇ ਦਸਵੇਂ ਜਨਮ ਦਿਨ ਤੇ ਉਸ ਦੇ ਪਿਤਾ ਜੀ ਨੇ ਕੀ ਤੋਹਫਾ ਦਿੱਤਾ 1... ਫੁੱਟਬਾਲ 2.. ਏਅਰ ਗੰਨ 3...ਬੈਟ 4... ਕੋਈ ਨਹੀਂ |
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Answer» we can't UNDERSTAND SORRY I can't help U oit |
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| 41. |
⚡What is Alpha ray?⚡ |
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Answer» An alpha ray is a STREAM of alpha particles. An alpha particle consists of two protons and two NEUTRONS bound TOGETHER into a particle identical to a HELIUM nucleus. It is radioactive and is produced in the process of alpha decay. Alpha particles, like helium NUCLEI, have a net spin of zero. |
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| 42. |
a string of length 8m fixed at both ends has a tension of 49n and mass of 200gms find the velocity of transverse wave on the string |
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Answer» Here, Length, L =10m Mass, M =5g×10 −3 kg Tension, T =80 N Mass per unit length of the wire is μ= L M
= 10m 5×10 −3 kg
=5×10 −4 kgm −1
SPEED of the transverse wave on the wire is ν= μ T
= 5×10 −4 kgm −1
=4×10 ms −1 =400ms −1 |
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| 43. |
A ray of light travelling through air falls on the surface of a glass slab at an angle i. Itis found that the angle between the reflected and the refracted rays is 90°. If thespeed of light in glass is 2 x 10 m/s, find the angle of incidence.I have the solution I needed explanation. ASAP |
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Answer» Answer: If carbon tetrachloride has an INDEX of refraction of 1.461, what is the SPEED of light through this liquid? (c = 3 X 108 m/s) a. 4.38 x 108 m/s b. 2.05 x 108 m/s c. 4.461 x 108 m/s d. 1.461 x 108 m/s
Answer: B Use the EQUATION v=c/n where n = 1.461 and c = speed of light in a vacuum (3x108 m/s). |
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| 44. |
Maya and Manu are helping their grandfather in shifting his old trunk. Should they push the boxfrom same side or from the opposite sides? Give reason in support of your answer. |
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Answer» They should PUSH the box from the same SIDE.
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| 45. |
the volume of gas is at 27 is 200cm wht be the temperature when the volume is250cm provide its pressure |
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Answer» SEE the ATTACHMENT for your ANSWER |
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| 46. |
In___b___ox not working?????Pls someone in____b_____ox me |
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Answer» ban hogya hai...!!! PLEASE POST only question THNQ |
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| 47. |
(D)None of these4.उत्तल दर्पण में प्रतिबिंब बनता हैIT |
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| 48. |
when the length of simple pendulum decrease by 20cm the time period changes by 10%find the original length of pendulum |
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Answer» Answer: izio to EU te amo te amo te amo te amo te amo te amo te amo te amo te amo te amo te amo te amo te amo te you are eating an orange juice and a man and a man and a man and a man and a man and a man and a man and a man the winner is R the winner of CLAY COUNTY road or |
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| 49. |
Define kinetic energy. |
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Answer» Answer: In physics, the kinetic ENERGY of an OBJECT is the energy that it possesses DUE to its motion. It is defined as the work NEEDED to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy UNLESS its speed changes Explanation: ✔ur answer dear⭕ |
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| 50. |
A convex lens of focal length 4cm is used in simple microscope then it's magnifying power when image at ddv is |
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Answer» Answer: disposal WO woop woop woop woop woop woop woop El so so do so do so so do so do dk dk dk dk dk dk dk dk dk to us to dk if DJ in dk if dj t dj us to do to us to TX dj tu us do TX tu to us do yes the un DI to us dj tu hv di to |
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