InterviewSolution
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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.
| 651. |
Derivation for lens maker formula for concave mirror |
| Answer» 11 me 11 ka hi pdo 12 ka nhi | |
| 652. |
What do you mean by geosynchronous Sattlite |
| Answer» Geosynchronous satellites are those satellites which are having same period time period as that of the earth and they are used for communication. There height approx 37000km. And speed 3km per sec | |
| 653. |
what is a numerical value of joule |
| Answer» 1*10^7 erg | |
| 654. |
What do you mean principle of a refrigerator (or heat pump)? |
| Answer» | |
| 655. |
Which fundamental law forms the basis of equation of continuity? |
| Answer» Conservation of mass<br>K=AV | |
| 656. |
Bernoulli\'s theorem explain |
| Answer» The sum of pressure energy kinetic energy potential energy per unit volume of a incompressible non viscous fluid for a streamlined irrotational flow is constant along a streamlineP+1/2¶v2+¶gh = constant<br>Sum of potential energy, kinetic energy and pressure energy is always constant.1/2 mv^2 + mgh + mP/\'rho\' = k | |
| 657. |
Write a newton law of cooling\xa0 |
| Answer» The rate of loss of heat is directly proportional to temperature diffrence between two bodies | |
| 658. |
State law of equipartition of energy ? |
| Answer» Equipartition of energy, law of statistical mechanics stating that, in a system in thermal equilibrium, on the average, an equal amount of energy will be associated with each independent energy state. | |
| 659. |
A crawl running over the wire gives it degree of freedom? |
| Answer» | |
| 660. |
What is angle of contact? |
| Answer» Angle of contact is the angle which is tangent to a liquid surface at the point of contact makes with the solid surface inside the liquid. | |
| 661. |
Important topics in physics....please help me |
| Answer» All | |
| 662. |
Show stress - strain curve for brittle material |
| Answer» Yield stress and neck formation is very early formed | |
| 663. |
What is strokes law? |
| Answer» According to Stokes law the backward viscous force acting on a small spherical body of radius R are moving with a uniform velocity V through fluid of viscosity neta is given by :- F =6nπrv<br>It is a law that predicts the frictional force on a spherical body falling through a viscous medium (like oil), under the influence of gravity. We have,F=6pie ×n× r×vWhere r=radius of the falling sphere,v= instantaneous velocity and n Is the viscosity of the medium The sphere accelerates until it reaches a steady terminal speed, i.e., when F is equal to the gravitational force on the sphere.<br>The viscous drag force (f) on the sphere of radius (r) moving with the velocity(v) through the fluid of viscocity(n) is F=6πnrv<br>\tThe force that retards a sphere moving through a viscous fluid is directly ∝to the velocity and the radius of the sphere, and the viscosity of the fluid.\tMathematically:-F =6πηrv where\tLet retarding force F∝v where v =velocity of the sphere\tF ∝ r where r=radius of the sphere\tF∝η where η=coefficient of viscosity\t6π=constant\tStokes law is applicable only to laminar flow of liquids.It is not applicable to turbulent law. | |
| 664. |
What is Le -chatelies principle?? |
| Answer» Thanku gitanjali<br>Change in any of the factors that determine the equilibrium conditions of a system will cause the system to change in such a manner so as to reduce or to counteract the effect of the change | |
| 665. |
State theorem of perpendicular axes |
| Answer» Iz= Ix+ Iyand these are perpendicular to each other. | |
| 666. |
What is Bernoulli equation and principle? |
| Answer» Bernoulli\'s equation:-P +1/2¶v2 +¶gh = constant Bernoulli\'s theorem states that the sum of pressure energy , potential energy , kinetic energy per unit volume of a incompressible and non viscous fluid in a streamlined flow along a streamline<br>If Any fluid flows from one place to another place then at every point its K.E,P.E and pressure energy will be constant<br>According to bernoulli, when an incompressible and non viscus(ideal fluid) liquid flows through a tube of uniform bore under the streamlined condition then the sum of K.E ,P. E and pressure enrgy( total energy of per unit mass and per unit volume is always be constant............. | |
| 667. |
Definition of coefficient of friction. |
| Answer» The ratio of limiting force and nomal reaction force is called coeffient of friction | |
| 668. |
Relation between angle of friction and coefficient of friction. |
| Answer» Coefficient of friction is equal to tangent of angle of friction | |
| 669. |
Explain the conversion of MKS system to CGS system. |
| Answer» Search it on net | |
| 670. |
Define torque.write its mathematical expression and what angle it becomes maximum? |
| Answer» Torque is the moment of force.Torque=force× perpendicular distance.Torque is maximum at 90° | |
| 671. |
Velocity of light in a |
| Answer» 3 lakh km/sec<br>3 multiply 10⁴+⁴ | |
| 672. |
What is coefficient of restitution or resilience? |
| Answer» | |
| 673. |
Show that acceleration due to gravity is independent of the mass of the body. |
| Answer» F= GMm/R^2mg=GMm/R^2g=GM/R^2 where M is the mass of earth. | |
| 674. |
Work energy theorem and it\'s derivation? |
| Answer» W.D.= ◇K.E.From 3rd equation of motion it will be solved.<br>Its too large | |
| 675. |
What is impulse force?write it\'s unit and dimensions |
| Answer» Change of force in short time intervalI = f◇t = m◇v Dimensions are MLT-1 | |
| 676. |
Why the outer edge of road is raised with respect to its inner edge on the turn |
| Answer» Its known as banking of road and it is done to prevent wear and tear of vehicle\'s tyres | |
| 677. |
Carnot reversible cycle |
| Answer» | |
| 678. |
Efficiency of heat engine |
| Answer» | |
| 679. |
Why there is negative sign in gravitational potential energy??????hurry up frnds?? |
| Answer» Because work done or gravitational potential energy is taken from infinity location<br>The negative sign indicates that gravity does positive work as mass approaches towards it.<br>Because potential energy is defined as the negative of wordone by the conservative force | |
| 680. |
Why wheatstone bridge does not consider during conduction? |
| Answer» | |
| 681. |
Explain the motion of body tied with a vertical massless spring then derive its time period. |
| Answer» | |
| 682. |
Raduis of gyriation |
| Answer» Distance of the partical from the center of the body<br>But you can refer it from additional books<br>It is not in cbse | |
| 683. |
Show that the velocity if sound increases by 0.61m/s for every 1\'c. |
| Answer» | |
| 684. |
If a body is raised to height h then what is the sign of the applied force and gravitational force |
| Answer» | |
| 685. |
Tomorrow is my xam...Plz give me some Imp topics? |
| Answer» NVM....btw Day after tomorrow\'Maths\'?????Any ThingGgGgG?<br>Physics?<br>Physics<br>Which subject | |
| 686. |
State perpendicular theorum |
| Answer» | |
| 687. |
Derive the expression for energy in S.H.M and force low for S.H.M |
| Answer» | |
| 688. |
Tommorow is my phy. Xam day so which chptr should i do effectively???? |
| Answer» All these<br>Fluids,oscillations,waves,ray optics,gravitation,system of particles | |
| 689. |
Newtons law of cooling |
| Answer» Newton\'s law of cooling states that the rate of heat loss of a body is directly proportional to the difference in the temperatures between the body and its surroundings provided the temperature difference is small and the nature of radiating surface remains same. | |
| 690. |
Define elastomers and draw a curve between stress strain for elostomers |
| Answer» Elastomers is the stretched object which regains its size and shape. | |
| 691. |
State hookes law |
| Answer» there are two types of hookes law 1 for spring2 for modullus of elasticity<br>Stress is directly proportional to strain under elastic limit. | |
| 692. |
What is the use of second law of newton ??? |
| Answer» it can be used to find out the force on a const mass caused due to accln.Rather nonconstant mass is also but it is in higher education .Eg truck se balu ja raha hai aur truck me chhed ho | |
| 693. |
How to measure dianeter of a small spherical |
| Answer» AimTo measure diameter of a small sphericallcylindrical body using Vernier Callipers.ApparatusVernier callipers, a spherical body (pendulum bob) or a cylinder and a magnifying lens.TheoryIf with the body between the jaws, the zero of vernier scale lies ahead of Nth. division of main scale, then main scale reading (M.S.R.) = N.If nth division of vernier scale coincides with any division of main scale, then vernier scale reading (V.S.R.)= n x (L.C.) (L.C. is least count of vernier callipers)= n x (V.C.) (V.C. is vernier constant of vernier callipers)Total reading, T.R. = M.S.R. + V.S.R. (L.C. = V.C.)= N + n x (V.C.).DiagramProcedure\tDetermine the vernier constant (V.C.) i.e. least count (L.C.) of the vernier callipers and record it step wise.\tBring the movable jaw BD in close contact with the fixed jaw AC and find the zero error. Do it three times and record them. If there is no zero error, record zero error nil.\tOpen the jaws, place the sphere or cylinder between the two jaws A and B and adjust the jaw DB, such that it gently grips the body without any undue pressure on it. Tight the screw S attached to the vernier scale V.\t\xa0Note the position of the zero mark of the vernier scale on the main scale. Record the main scale reading just before the zero mark of the vernier scale. This reading (1ST) is called main scale reading (M.S.R.).\tNote the number (n) of the vernier scale division which coincides with some division of the main scale.\tRepeat steps 4 and 5 after rotating the body by 90° for measuring the diameter in a perpendicular direction.\tRepeat steps 3, 4, 5 and 6 for three different positions. Record the observations in each set in a tabular form.\tFind total reading and apply zero correction.\tTake mean of different values of diameter and show that in the result with proper unit. | |
| 694. |
Name two quantities having same unit |
| Answer» Work and energy<br>Force and pressure..<br>Speed and velocity mpersec<br>Force and work | |
| 695. |
What is meant by rotational motion |
| Answer» | |
| 696. |
Define radius of gyration. Write expression for it |
| Answer» The root mean square distance of the particles from the axis of rotation.<br>The radius of gyration of a body rotating about an axis is defined as the distance between axis of rotation and the point at which entire mass of the body can be supposed to be concentrated so as to give the same moment of inertia as that of body about given axis. I=MK^2 | |
| 697. |
Define radius of gyration,derive an exlression for it? |
| Answer» The radius of gyration of a body rotating about an axis is defined as the distance between axis of rotation and the point at which entire mass of the body can be supposed to be concentrated so as to give the same moment of inertia as that of body about given axis. I=MK^2<br>In simple words...Radius of gyration is defined as the distance from the axis of rotation to a point where the total mass of the body is supposed to be concentrated, so that the moment of inertia about the axis may remain the same. Simply, gyration is the distribution of the components of an object. Derivation is little bit hard for me to send. Pics cant be send by students | |
| 698. |
Explain the working of a sling on the basis of the parallelogram law of addition of a vector?? |
| Answer» | |
| 699. |
Define ashesive + cohessive forces |
| Answer» | |
| 700. |
Difference between transverse and longitudinal wave |
| Answer» Transverse Waves: Displacement of the medium is perpendicular to the direction of propagation of the wave. ... Longitudinal Waves: Displacement of the medium is parallel to the direction of propagation of the wave. | |