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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.
| 9801. |
Obtain an expansion for pressure of a liquid coloumn |
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| 9802. |
Why do air bubbles in a liquid move in an upward direction?\xa0 |
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Answer» Because the density of the bubbles are lighter than the liquid Because the pressure inside the air bubble is greater than the atmoshpheric pressure.So they move upwards. I think because of their light weight |
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| 9803. |
||gm law of vector addition |
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| 9804. |
What is doppler effect ? |
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Answer» Its the apparent change in the frequency as observed by the observer due to the relative velocities of the source and the observer. The Doppler effect is defined as a noticeable change in the frequency of sound, light or water waves as the source and the observer move. |
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| 9805. |
Avogadros hypothesis for measuring radius of the atom |
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| 9806. |
Derive an expression for the height to which the liquid rises in a capillary tube of radius r |
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| 9807. |
Why we study physics? |
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Answer» To know every phenomenon which are occuring in the universe. Because you have taken science field......????? |
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| 9808. |
find the ratio of the orbital velocity and escape velocity of a satellite |
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Answer» √2 :1 By mistake.Ignore the answer. \xa0\xa0Q.\xa0What is the value of Sin(31π/3)= sin(31π/3)= sin(10π+π/3)= sin(π/3)=\xa0√3/2 ( in quadrant 1 )ORSin ( 31 x 180 / 3)= sin ( 31 x 60)\xa0= sin(1860)\xa0= sin(5x360 - 60)\xa0=sin60\xa0=root3/2 Root 2 ratio 1 |
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| 9809. |
State and proof bernaulli\'s theorem |
| Answer» \ttatement: For the streamline flow of non-viscous and incompressible liquid, the sum of potential energy, kinetic energy and pressure energy is constant.\xa0 Proof:\xa0Let us consider the ideal liquid of density ρ flowing through the pipe LM of varying cross-section. Let P1\xa0and P2\xa0be the pressures at ends L and M and A1\xa0and A2\xa0be the areas of cross-sections at ends L and M respectively. Let the liquid enter with velocity V1\xa0and leave with velocity v2.\xa0 Let A1\xa0> A2.\xa0 Now, by equation of continuity,\xa0 Since, A1\xa0> A2 Therefore,\xa0 v2\xa0> v1\xa0and P1\xa0> P2\xa0 Let, m be the mass of liquid enetring at end L in time t.\xa0 The liquid will cover a distance = v1t\xa0 Therefore, the work done by pressure on the liquid at end L in time t is,\xa0 W1\xa0= Force\xa0\xa0 = P1A1v1t ... (1)\xa0 Since same mass m leaves the pipe at end M in same time t, in which liquid will cover the distance given by\xa0v2t. Therefore, work done by liquid against the force due to pressure P1\xa0is given by,\xa0 W2\xa0= P2A2v2t ... (2)\xa0 Net ork done by pressure on the liquid in time t is,\xa0 W = W1\xa0- W2\xa0 =P1A1v1t -\xa0P2A2v2t ... (3)\xa0 This work done on liquid by pressure increases it\'s kinetic energy and potential energy.\xa0 Increase in K.E of liquid is,\xa0 That is,\xa0\xa0\t\xa0 | |
| 9810. |
Also derive an expression for the height of a satellite |
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| 9811. |
What is si unit of gravitation constant |
| Answer» Nm²/kg² | |
| 9812. |
Conservative force and non conservation force problems with solutions |
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| 9813. |
What is heat pump.give an example |
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| 9814. |
Please sir provide me a model paoer of class 11th for hindi medium with solution |
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| 9815. |
Degree of freedom of solid at high temp |
| Answer» A monoatomic ideal gas has heat capacity C v = 1.5 which comes from the three translational degrees of freedom. For solids at high temperature, C v = 3 , implying six degrees of freedom...! | |
| 9816. |
Prove gravitational force is a conservative force |
| Answer» Because it is not dependent on its path. It just depend on initial and final position | |
| 9817. |
Relation between kinetic and linear momentum |
| Answer» Let m is the mass of a bodyv is the velocity of bodyTherefore of momentum of body p = mvK.E. = 1/2 mv2= 1/2m (m2v2)= 1/2m (p)2= p2/2mThis is an important relation. It shows the body cannot have K.E. without having linear momentum and vice verse. | |
| 9818. |
What is absorptive or emissive power? |
| Answer» Emissive power : Energy radiated by the body per unit time is defined as the Emissive power of the body.Absoptive power: The ratio of the amount of heat energy absorbed by the surface in a certain time to the amount of heat energy falling normally on the suface in the same time. | |
| 9819. |
Anyone can send blue print of cbse physics +1 |
| Answer» It depends upon ur school only. In my school it is divided equally for all chapters | |
| 9820. |
Physics practical experiment helical spring readings |
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| 9821. |
Explain that refractiv |
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| 9822. |
What is work energy theoram ? |
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Answer» It states that the work done on a body is equal to the change in it\'s kinetic energy This relation between the kinetic energy of an object and workdone is called “Work-Energy Theorem”. It is expressed as:Work - Energy Theorem |
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| 9823. |
wat is echo |
| Answer» a sound that is repeated as it is sent back off a surface ,such as the wall of a tunnel. | |
| 9824. |
Calculate the speed of sound in air at STP the mass of 1 mole of air 29×10^-3kg |
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| 9825. |
Does a rocket really need the escape velocity of 11.2km/s initially to escape from the earth? |
| Answer» Yes it required escape velocity to completely overcome Earth\'s gravitational field. ... | |
| 9826. |
Identify the term which has unit but no dimensions |
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Answer» Strain Solid angle Angle.... |
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| 9827. |
Pascal\'s law application |
| Answer» Hydraulic brakes and hydraulic lift | |
| 9828. |
Why more viscous mobile oil is used in summer than in winter in scooter or vehicle?????? |
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| 9829. |
Check the dimensional consistency of the poiseuilles formula? |
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| 9830. |
Drive an extension for the excess of pressure inside a liquid drop? |
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| 9831. |
Drive the relation between alpha beta and gamma? |
| Answer» 6alpha=3beta=2gamma | |
| 9832. |
what do you mean by conservative forces? |
| Answer» When work done by a force is path independent and depends only on initial and final state then the forces are known as conservative forces . The work done by conservative forces in a closed loop is zero i.e. when initial and final positions are same the work done is zero .Example - gravitational force , electrostatic force , spring force etc. | |
| 9833. |
resistor of parallel |
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| 9834. |
What will be the wave velocity, if the radar gives 54 wave permiñute and wave length is10m. |
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| 9835. |
Define law of inertia? |
| Answer» Law of inertia states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. | |
| 9836. |
Newton formula for the speed of sound in a gas with explainiation |
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| 9837. |
What is the escape velocity of earth |
| Answer» 11.2 km/s... | |
| 9838. |
What is the female part of the flower made up of |
| Answer» Carpel pistil | |
| 9839. |
What is the main purpose of physics |
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Answer» To understand how priciples of various scientist works. Mainly machines,electricity is important. U need to get job also right u have to use these education in that To understand the basic laws behind the things which goes in our day to day life |
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| 9840. |
What is oblique projection |
| Answer» When an object is projected at an angle with respect to the horizontal, then we say that the object is projected obliquely. This type of projection of the object is termed as oblique projection. | |
| 9841. |
Artificial satellite find its orbital velocity and time period around a planet |
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| 9842. |
What is optical instrument? Define its types? |
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Answer» There are two basic types of telescopes: reflecting telescopes and refracting telescopes. A reflecting telescope is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image.Refracting telescope is a telescope which uses a converging lens to collect the light. An optical instrument is a device that either processes light waves to enhance an image for viewing, or analyzes light waves to determine one of a number of characteristic properties. |
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| 9843. |
what is frame of reference and and how many type? |
| Answer» a frame of reference (or reference frame) consists of an abstract coordinate system and the set of physical reference points that uniquely fix (locate and orient) the coordinate system and standardize measurements. It is four type 1)Body-fixed frames of reference 2)Space-fixed frames of reference 3)Inertial frames of reference 4)Non-Inertial frames of reference. | |
| 9844. |
Why same charge repell each other while the opposite charge attract to each other |
| Answer» Same charge will repel each other bcoz,say Two electrons will tend to repel each other because both have a negative electrical charge. Two protons will also tend to repel each other because they both have a positive charge. On the other hand, opposite cahrge will attract bcoz as electrons and protons will be attracted to each other because of their unlike charges. | |
| 9845. |
Please tell in myopia power negative me hoti hai kyaa? |
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Answer» Myopia requires a concave lens, which has a negative focal length when sign convention is applied. Thus, the power is negative. Corrective lenses for myopia have negative powers because a divergent lens is required to move the far point of focus out to the distance. |
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| 9846. |
Derivation of doppler efect |
| Answer» The apparent change in frequency due to relative motion between the source and the listener is called Doppler Effect. A station master hears a continuous low intensity sound of the horn of a diesel locomotive fast approaching the station. As it is a pass through station where the train has no designated halt, the station master shows the green flag. The pitch of the sound of the horn increases fast as the locomotive approaches the station and decreases fast as it passes though the station even though horn is emitting a sound with a constant pitch. | |
| 9847. |
About rocket propulsion |
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| 9848. |
Streamline flow and turbulent Flow difference? |
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Answer» i) It is an orderly type of motion in which the liquid flows in parallel layers while, turbulent motion is disorderly type of motion.ii) Every particle of the liquid follows the path of it\'s preceeding particle and travel with the same velocity in magnitude and direction whereas, the motion of particles of the liquids becomes different at different points in turbulent flow.iii) The velocity of streamline flow is less than critical velocity but, in turbulent motion the liquid moves with a velocity greater than the critical velocity of the liquid.iv) Streamline flow is laminar whereas, turbulent flow is non-laminar. In streamline flow liquid flows in such a way that each particle passes through the same point as it\'s preceding one , while in turbulent flow liquid flows in such a way that the path of particle is not constant. |
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| 9849. |
Explain the working of J-K flip flop. |
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| 9850. |
Prove that the path of projectile is parabolic. |
| Answer» He man i think that you should have to read your textbook for this question | |