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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your Class 11 knowledge and support exam preparation. Choose a topic below to get started.
| 2651. |
Relation between impulse and momentum ? |
| Answer» Impulse = Change in momentum | |
| 2652. |
Logx.sin(bx) |
| Answer» | |
| 2653. |
Under what condition the magnitude of displacement is equal to total path length ? |
| Answer» In straight line and along ome direction only<br>O<br>When they move in a straight line | |
| 2654. |
What is Boyle\'s law ? |
| Answer» Pressure is inversely proportional to the volume at constant temperature.<br>Pressure is inversely proportional to volume | |
| 2655. |
What is inpulse |
| Answer» impulse is a large amount of force working on a body for a short period of time<br>Impulse is defined as a force multiplied by time it acts over. For example: Tennis racket strikes a ball, an impulse is applied to the ball. The racket puts a force on the ball for a short time period. | |
| 2656. |
Energy of satellite |
| Answer» | |
| 2657. |
Pressure of ges |
| Answer» Where p is pressure, n is no. Of moles of gases,R is universal gas constant,T is temperature and V is Volume<br>P=nRT/V | |
| 2658. |
Scalar product and its properties |
| Answer» It shows Magnitude and unit is called scalar quantity. | |
| 2659. |
Define type of product in vector |
| Answer» Physics wallah ki video se samajh lo<br>There are 2 types of products in vector 1) dot product- A.B2)Cross product- A×B.... | |
| 2660. |
What do you mean by torque |
| Answer» The vector product of force and distance from axis of rotation for centre of mass<br>Angular force is known as torque<br>Physics wallah ki video se samajh lo<br>It is a rotational analogue of force, also commonly known as moment of force. | |
| 2661. |
Define random error |
| Answer» statistical error that is wholly due to chance and does not recur —opposed to systematic error.<br>The random error are those error, which occur irregularly and hence are random with respect to sign and size | |
| 2662. |
What is the function of physics? |
| Answer» ??????? | |
| 2663. |
Friends kl mera exam h physics ?? |
| Answer» Koi chandigarh se h kya???<br>Harsh kaisa gya.? ...mera Wednesday ko hai !!<br>Harsh all the best mera English ka hai ✌️ | |
| 2664. |
proof I=mr2 |
| Answer» Sorry g | |
| 2665. |
Explain projectile motion |
| Answer» When an object projected with some angle from the ground and allow to move under the influence of gravity ,then the motion possess by the object is called projectile motion<br>When a body projected on a parabolic path then the motion of the body is parabolic ???<br>Motion where an object moves in parabolic path, the object is called projectile and its motion is called projectile motion.<br>IF an object is thrown with some initial velocity and which is then allowed to move under the action of gravity is known as ?????????? ??????. | |
| 2666. |
Bernoulli theoremSolutions |
| Answer» First find net workdone Net w.d= ∆ke+∆p.eThen eq of continuityThen find ∆k ∆uAnd total net workdone And substitute all the value in first eq. | |
| 2667. |
Obtain expression for pressure in terms of height |
| Answer» | |
| 2668. |
What is class 11 examination date |
| Answer» It depends on your locality<br>1 March<br>It depends on your school<br>1 march | |
| 2669. |
Perelx method |
| Answer» | |
| 2670. |
What is a difference between kinetic friction and static friction??? |
| Answer» The tangential component of the force of interaction between two surfaces in contact is called friction. It leads to resistance against movement between the surfaces and can cause mechanical deformation and heating.Depending on whether the surfaces are at rest\u202for in relative motion against each other, the friction divides into static and kinetic friction.<br>Kinetic friction comes to play when body is moving on the other hand static fraction comes to play when body is about to move (not moving actually). | |
| 2671. |
A car travels from a to b at a speed of 20km h and returns at a speed of 30 km h |
| Answer» Let us assume the distance between A to B is x km.So , the car travels a total distance of (x+x) = 2x km.Now, the car travels at a speed of 20 km/hr from A to B .So, time taken by the car to reach at the point B from point A is given by,Car travels 20 km in 60 minutes.Car travels x km in (60÷20)×x minutes= 3x minutesNow, in the time of returning the car returns at a speed of 30 km/hr.So, time taken by the car to reach A from B is given by,Car travels 30 km in 60 minutes.Car travels x km in (60÷30)×x minutes= 2x minutes.So , the car takes a total time of ( 3x+2x)=5x minutes.Now , the average speed of the car for the whole journey is given by,In 5x minutes the car covers a distance of 2x km.So, in 60 minutes the car covers a distance of (2x÷5x)×60 km= 24 km.So , the average speed of the car for the whole journey is 24km/hr. | |
| 2672. |
There is a steel wire of length 2m and cross section area 1.2mm2.What force |
| Answer» | |
| 2673. |
What is the dimensions of candela |
| Answer» It is the SI unit of luminous intensity.It has no dimensions although it can be used a dimension.As the dimensions of luminous intensity is [M⁰ⁿ^0 L^0T^0 cd^1]<br>Cd | |
| 2674. |
Prso exam hai .. kush nahi aata ... Koi tip? |
| Answer» Be clam in examination and first select some chapters from every subject 5 to 6 and do it nicely learn definitions derivations and important things prepare only those 5 to 6 chapters from each subject you will pass definately.<br>Ab toh muskil tera paas hona<br>Bro try to learn all the formulas and derivations also read the theory part once<br>Firstly Keep calm and just chill...go through your notes and solve at least 2 questions of each concept ...all the best ? | |
| 2675. |
Anushka tum kaha se ho |
| Answer» | |
| 2676. |
Derivation of mean free path |
| Answer» | |
| 2677. |
An elevator |
| Answer» | |
| 2678. |
Derive expression of surface tension |
| Answer» Surface tension is defined as, The ratio of the surface force F to the length L along which the force acts. Mathematically, surface tension can be expressed as follows: T=F/L. | |
| 2679. |
Why electron have negative charge |
| Answer» We know that atom is electrically neutral and at that time only protons were discovered so they stated that there is negatively charged body which make atom electrically neutral and later was termed as electron<br>Electric\xa0charge\xa0is a physical property of matter. It is created by an imbalance in a substance\'s number of protons and\xa0electrons. The matter is positively charged if it contains more protons than\xa0electrons, and it is negatively charged if it contains more\xa0electrons\xa0than protons. | |
| 2680. |
explain why newtons 2nd law of motion is called the real law of motion |
| Answer» because by newton\'s 2nd law of motion we can prove first law and third law of motion. | |
| 2681. |
Barnollis principal |
| Answer» Bernoulli\'s principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in static pressure or a decrease in the fluid\'s potential energy. | |
| 2682. |
What are called waves ? Mention there importance |
| Answer» A wave is a disturbance that moves energy from one place to another. Only energy — not matter — is transferred as a wave moves. The substance that a wave moves through is called the medium. ... But the wave travels along the medium. | |
| 2683. |
What is hooke laey |
| Answer» Hooke\'s law - stress is directly proportional to strain | |
| 2684. |
Exceptional behavior of water in thermal expansion |
| Answer» | |
| 2685. |
The number of significant figures in 0.06900 is ? |
| Answer» 4 significant figures<br>4 significant figures (considering 2 zero significant.) | |
| 2686. |
What is moi |
| Answer» Rotational inertia, or the moment-of-inertia (MOI) is a measure of how difficult it is to change the rotational velocity of an object which is rotating about a pivot point. The larger the moment-of-inertia, the more difficult it is to change the rotational speed of the object. | |
| 2687. |
when does class 11 exam will be conducted |
| Answer» I think 2 march | |
| 2688. |
Define projectile motion and define expression for time of flight , horizontal range and max height |
| Answer» Projectile motion = A motion experienced by an object or particle that is projected near earth surface and moves along a curved path under the action of gravity. | |
| 2689. |
Dimensional analysis applications |
| Answer» | |
| 2690. |
Can we design an aeroplane which is very light but sufficiently strong ? |
| Answer» Yes we can With aluminium as aluminium is light in weight and it is a strong metal. | |
| 2691. |
A person of mass 60kg lift a stone of 20kg to a height of 30meter. Calculate work done by person. |
| Answer» M=60+20=80KgH=30m g=10W=m×g × h =80×10×30 =24000J | |
| 2692. |
What is coefficient of liner expansion |
| Answer» C of linear expansion is defined as the expansion take place in a 1meter rod at 1℃ | |
| 2693. |
brief discuss about any 3 international competition of althetes |
| Answer» | |
| 2694. |
Explain the four fundamental forces with different examples |
| Answer» gaaand mara<br>Following are the four fundamental forces in nature:Gravitational force:\xa0Gravitational force is one of the four fundamental forces of nature. It is the weakest of the four. It is also the attractive force which arises from the gravitational interaction.Example:\xa0(i)\xa0The revolving of the moon around the earth is due to gravitational attraction between them.(ii)\xa0The formation of tides in the ocean is due to the gravitational force acting between the earth and the moon.Electromagnetic force:: It is the\xa0force between charged particles. Charges at rest have electric attraction (between unlike charges) and repulsion (between like charges). Charges in motion produce magnetic force. Together they are called Electromagnetic Force.Strong nuclear force:Strong Nuclear Force: It is the\xa0attractive force between protons and neutrons\xa0in a nucleus.It is charge-independent and acts equally between a proton and a proton, a neutron and a neutron, and a proton and a neutron. Recent discoveries show that protons and neutrons are built of elementary particles,\xa0quarks.Weak nuclear force: This force appears only in certain nuclear processes such as the\xa0β-decay of a nucleus. In β-decay, the nucleus emits an electron and an uncharged particle called\xa0neutrino.This particle was first predicted by Wolfgang Pauli in 1931.<br>Following are the four fundamental forces in nature:\tGravitational force:\xa0Gravitational force is one of the four fundamental forces of nature. It is the weakest of the four. It is also the attractive force which arises from the gravitational interaction.\tExample:\xa0\t(i)\xa0The revolving of the moon around the earth is due to gravitational attraction between them.\t(ii)\xa0The formation of tides in the ocean is due to the gravitational force acting between the earth and the moon.\tElectromagnetic force:: It is the\xa0force between charged particles. Charges at rest have electric attraction (between unlike charges) and repulsion (between like charges). Charges in motion produce magnetic force. Together they are called Electromagnetic Force.\tStrong nuclear force:\tStrong Nuclear Force: It is the\xa0attractive force between protons and neutrons\xa0in a nucleus.It is charge-independent and acts equally between a proton and a proton, a neutron and a neutron, and a proton and a neutron. Recent discoveries show that protons and neutrons are built of elementary particles,\xa0quarks.\tWeak nuclear force:\xa0\xa0This force appears only in certain nuclear processes such as the\xa0β-decay of a nucleus. In β-decay, the nucleus emits an electron and an uncharged particle called\xa0neutrino.This particle was first predicted by Wolfgang Pauli in 1931. | |
| 2695. |
Prove that the escape velocity from the surface of the earth is 11.2 km/s |
| Answer» Assume a perfect sphere-shaped planet of radius\xa0R\xa0and mass\xa0M. Now, if a body of mass\xa0m\xa0is projected from a point\xa0A\xa0on the surface of the planet. An image is given below for better representation:sIn the diagram, a line from the center of the planet i.e.\xa0O\xa0is drawn till\xa0A\xa0(OA) and extended further away from the surface. In that extended line, two more points are taken as\xa0P\xa0and\xa0Q\xa0at a distance of\xa0x\xa0and\xa0dx\xa0respectively from the center O.Now, let the minimum velocity required from the body to escape the planet bveThus, Kinetic Energy will beAt point\xa0P, the body will be at a distance\xa0x\xa0from the planet’s center and the force of gravity between the object and the planet will be:To take the body from\xa0P\xa0to\xa0Q\xa0i.e. against the gravitational attraction, the work done will be->Now, the work done against the gravitational attraction to take the body from the planet’s surface to infinity can be easily calculated by integrating the equation for work done within the limits\xa0x=R\xa0to\xa0x=∞.Thus,By integrating it further, the following is obtained:Thus, the work done will be:Now, to escape from the surface of the planet, the kinetic energy of the body has to be equal to the work done against the gravity going from the surface to infinity. So,K.E. = WPutting the value for K.E. and Work, the following equation is obtained:From this equation, the escape velocity can be easily formulated which is:Putting the value of\xa0g = GM,\xa0the value of escape velocity becomes:From this equation, it can be said that the escape velocity depends on the radius of the planet and the mass of the planet only and not on the mass of the body.Escape Velocity of Earth:From the above equation, the escape velocity for any planet can be easily calculated if the mass and radius of that planet are given. For earth, the values of g and R are:g = 9.8\xa0mR = 63,781,00 mSo, the escape velocity will be:ve=2×9.8×63,781,00−−−−−−−−−−−−−−−−√Escape Velocity of Earth= 11.2 km/s. | |
| 2696. |
T=kmlg |
| Answer» $$T = 2 \\pi m \\sqrt{\\dfrac{l}{g}}$$ | |
| 2697. |
abhikendra tvaran kya hai |
| Answer» | |
| 2698. |
Derive all formula for propulison of rocket |
| Answer» Let us consider, rocket of mass m0\xa0take off with velocity v0\xa0from ground. Let the fuel burnt at the rate of dm/dt and burnt gases eject with velocity u w.r.t. rocket.Let at any instant t, v be the velocity of rocket and m be the mass of rocket. Therefore velocity of burnt gas ejected w.r.t. ground is (v – u). As the fuel burns at the rate of dm/dt, therefore in time dt, dm mass of the fuel will burn and velocity of rocket increases by dv.Here m is the mass of rocket and dm is the mass of gas ejected. As the fuel burns the mass of rocket decreases. Therefore, to calculate the velocity of rocket at any instant in terms of mass of rocket, dm must be replaced by ‘dm’.\xa0 | |
| 2699. |
What is physics ?? |
| Answer» It is the laws and principles that governs the universe<br>Or everything that is happening around us is called physics<br>The study of nature is called physics | |
| 2700. |
What do you mean by water equivalent |
| Answer» Water equivalent is defined as the amount of water that can replaces any substance gaining the same variation in temperature, when provided with the same amount of energy as that of substance. It is written as W. | |