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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 7901. |
Representations of angualr momentum in polar cordinates |
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| 7902. |
Prove trahectry of projectile is parabolic |
| Answer» Motion in horizontal direction u=ucos○ a=0 s=X from s=ut+1/2at^2 t=x/ucos○Now motion in vertical direction u=usin○ a=-g t=x/ucos○ now from same equation s=usin○.x/ucos○ +1/2 (-g) x2/u2cos2● solving this we get s=tan●x-1/2 (g/u2cos2●) x2 which is a equation of quadratic so path of projectile is parabolic | |
| 7903. |
d/dx( x×xsin4x) |
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| 7904. |
Convert joule into erg? |
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Answer» Convert the MKS system to CGS system you will get the answer 1Joule=10^7erg |
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| 7905. |
Why is the whiles of auto mobiles is circular? |
| Answer» Because rolling friction is less than sliding friction | |
| 7906. |
State reason true or false (a)the magnitude of vector is always a scalar |
| Answer» True | |
| 7907. |
How to find vectors |
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| 7908. |
The potential energy of a particle U=a/r×r -b/r. The system is in neutral equilibrium |
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| 7909. |
Best side book for physics except HC Verma.???? |
| Answer» Modern abc | |
| 7910. |
What is relation between G and G |
| Answer» G=gr^2/m or g=Gm/r^2 | |
| 7911. |
Second law of motion derives 3rd law |
| Answer» Acc. to 3rd lawFab=―FbaAcc to 2nd law Fab=dpA/dt....1SimilarlyFab=dpB/dt...2Adding 1 and 2Fab+Fba=(dpA/dt+dpB/dt)=d(pa+pb)/dtAcc to conservation od momentumpA +pB=constantSo Fab=―FbaHence proved | |
| 7912. |
Angular acceleration |
| Answer» Angular acceleration is the rate of change of angular velocity. In SI units, it is measured in radians per second squared | |
| 7913. |
1 N |
| Answer» IN = 1kg × 1m/s^2 | |
| 7914. |
What is normal reaction? |
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Answer» the virtue of weight of a body Normal reaction is the equal and reaction of ground by the virtue of Opposite to force of gravity |
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| 7915. |
Do fishes drink water when they are in water |
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| 7916. |
What is analogue of rotational motion? |
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| 7917. |
Why a tennis ball bounce more on hills than in plains? |
| Answer» Acceleration due to gravity on hill is less than that on the surface of earth (due to altitude effect ), so the ball will bounce higher on hills than on planes . | |
| 7918. |
What is to torque |
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Answer» Torque is the moment of rotating force Torque: It is a measure of the force that can cause an object to rotate about an axis.\xa0Force causes an object to accelerate in linear kinematics, torque causes an object to acquire angular acceleration. Torque is a vector quantity. The direction of the torque vector depends on the direction of the force on the axis. |
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| 7919. |
What is toque ? |
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| 7920. |
Whythe earth revolving |
| Answer» The more mass an object has, the greater its gravitational pull on other objects. The most massive object in the solar system is the sun because the amount of gravity exerted by the sun is so much more than the Earth’s gravitational pull, the Earth is forced into an orbit around the sun. The sun’s gravity pulls the Earth toward it and makes it revolving. | |
| 7921. |
Direction of linear velocity of rigid objects at fixed axis |
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| 7922. |
Derive 1st &3rd law of newton using 2nd law of Newton |
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| 7923. |
On what factors centre of mass depends.? |
| Answer» The factors on which center of mass depend upon are _ 1) mass of rigid body 2) position of mass from axis 3) axis of system 4) distribution of mass | |
| 7924. |
Work done on a body is equal to work done by the body. True or false |
| Answer» False.zero work by the body is not applicable here | |
| 7925. |
How to derivative formula of work? |
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| 7926. |
Define density with si unit |
| Answer» DENSITY:- mass per unit volume is termed as density. SI unit os density is Kg/meter^3\xa0 | |
| 7927. |
How instantaneous velocity change with respect to slope ????and how we compare velocity in slope |
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| 7928. |
Why pulling is easier than pushing? |
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Answer» when you push there is one component of force that leads to weight of body and hence there is more friction but when you pull the vertical component of force is against the weight of body and hence there is less overall friction, so it is easy to pull than push an object. Let us consider a roller of weight w and pulled or pushed by a force F, making an angle (thita) with the horizontalIn Pulling, The effective weight of the roller is equal to w-sin (theta) and the effective force acting on the horizontal is f cos (theta) in the forward direction.In Pushing, The effective weight in pushing the roller is equal to w + sin (theta) in the effective force acting in forward direction is the f cos (theta) in the horizontal direction. Since the effective weight of the roller is less in pilling than in pushing hence lesser force is required in pulling with the comparison to pushing therefore it is easier to pull a lawn roller than to push it. |
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| 7929. |
Law of conservation of energy |
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Answer» Total energy of the universe remain constant (this is one optional answer for your question) It states that energy can neither be created nor be destroyed, but it can be transmitted from one form to another . It states that energy can neither be created nor destroyed, but it can transmitted from one form into another. |
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| 7930. |
Which quantity remains constant during the free fall |
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Answer» Total mechanical energy, acceleration due to gravity (g)..remains constant Velocity remains constant because during free fall net force acting on body is 0 . During free fall the total mechanical energy of a body remains constant |
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| 7931. |
Define distance and displacement ? |
| Answer» Total distance covered by a body is called distance and the shortest distance covered by a body is called displacement | |
| 7932. |
State Newton 1st law of motion |
| Answer» It states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. | |
| 7933. |
Center of mass of motion object |
| Answer» It is a point where whole mass of body is supposed to be concentrated | |
| 7934. |
How to draw a vector perpendicular to another vector? Explain with example. |
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| 7935. |
What is orbital velocity |
| Answer» Orbital speed of a body generally a planet is the speed at which it orbits around the barycentre of a system usually around a more massive body.It can be used to refer to either the mean orbital speed, i.e. the average speed as it completes an orbit. | |
| 7936. |
formula for instaneous acceleration |
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Answer» ∆v\\∆t it is the instantaneous rate of change of velocity with respect to to time The Acceleration is the rate of change of velocity with respect to time.The Acceleration can also be defined mathematically bya = v/t ,Where, a = acceleration of the moving body ,v = velocity of the moving body ,t = time. |
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| 7937. |
Derive 3 eq. Of motion |
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| 7938. |
What is angle of repose |
| Answer» Angle of repose is defined as the minimum angle made by an inclined plane with the horizontal such that an object placed on the inclined.\xa0 | |
| 7939. |
How many ergs are there in one joule |
| Answer» An erg is the amount of work done by a force of one dyne exerted for a distance of one centimetre. In the CGS base units, it is equal to one gram centimetre-squared per second-squared (g. cm2/s2). It is thus equal to 10−7 joules or 100 Nano joules (nJ) in SI units. | |
| 7940. |
Does coefficient of friction depend on mass of the object? |
| Answer» The magnitude of the friction force is the product of the mass of the object, the acceleration due to gravity, and the coefficient of friction. However, the coefficient of friction is not a function of mass or volume it depends only on the material. | |
| 7941. |
Can water be made to boil without heating |
| Answer» If the pressure is quickly reduced, the 221°F (105°C) water at normal pressure will now boil. For another example, put water at room temperature into a vacuum chamber and begin removing the air. Eventually, the boiling temperature will fall below the water temperature and boiling will begin without heating. | |
| 7942. |
what do you mean by instanious velocity |
| Answer» Instantaneous velocity is defined as the rate of change of position for a time interval which is very small (almost zero). As this time interval approaches zero, the displacement also approaches zero. But the limit of the ratio of displacement and time is non zero and is called the instantaneous velocity. | |
| 7943. |
difference between angular velocity and linear velocity |
| Answer» \t\xa0Linear VelocityAngular VelocityDefinitionWe define the linear velocity as the rate of change of the linear displacement.We define the angular velocity as the rate of change of angular displacement.Key DifferencesIn a circular motion, the linear velocity of a particle is along the circumference of a circle.\xa0It is different at different points on the circle.The angular velocity of a particle is along the axis of a circle.It remains the same throughout the circular motion.SymbolThe symbol for the linear velocity is v.The symbol for angular velocity is a Greek letter, i.e., ω (pronounced as omega).Formulav = ΔSΔt = 2πrtω = ΔθΔt = 2πrtQuantityIt is a vector quantity that implies it has both magnitude & direction.It is an axial vector. Its because the direction of the displacement of the particle is along the axis of the circle.Measuring UnitWe measure the linear velocity in m/s.We measure the angular velocity in both degrees and radians. A degree is a dimensionless unit. Radian is an SI unit.Real-life ExampleIf your office is at 150 km distance from your home, then your car will acquire a linear velocity.\xa0\t | |
| 7944. |
i cant understand the topic - newton\'s second laq is the real law of motion |
| Answer» From Newton\'s second law first law and third | |
| 7945. |
If momenta of two different bodies are equal then find the relation between their kinetic energy? |
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| 7946. |
The correct relation between torque and moment of inertia is - |
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| 7947. |
What is vsctor |
| Answer» Vector is that quantity which has magnitude as well as direction..ex displacement | |
| 7948. |
If the distance covered is zero the displacemant |
| Answer» If the distance is 0 than the displacement is 0 | |
| 7949. |
A physical quantity p is related to form observable a b c and d p=a cube b cube ÷root c d |
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| 7950. |
What is elastic collision |
| Answer» An elastic collision is a collision in which there is no net loss in kinetic energy in the system as a result of the collision. Both momentum and kinetic energy are conserved quantities in elastic collisions. | |