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InterviewSolution
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.
| 8751. |
Define renewable or conventional sources of energy. |
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Answer» SOLUTION :Renewable or Non-conventional SOURCE of energy. Sources from which we can be assured of constant supply of energy at a perpendicular rate i.e. the source which can be regenerated are called renewable source of energy. Convetional sources of energy. Sources of energy that will get DEPLETED some day are SAID to be exhaustible source or TRADITIONAL source or non-renewable sources of energy. |
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| 8752. |
An electric heater consumes 1.1 kW power when 220 V voltage is applied to it. The current flowing through it must be ……………… . |
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Answer» <P>1.1 A `:. I = P/V = (1.1 XX 10^3)/220= 1100/220 =5 A` |
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| 8753. |
List three sources of magnetic fields. |
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Answer» SOLUTION :(i) Moving charges (III) Electric CURRENT (iii) Magnet |
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| 8754. |
The gas released when the sumlight breaks down chlorofluorocarbons is |
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Answer» CARBON dioxide |
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| 8755. |
Most of the power stations producedirect current. |
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Answer» Solution :FALSE. Most of the POWER stations produce ALTERNATING CURRENT. |
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| 8756. |
The directionof a magnetic field can be determined using |
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Answer» FARADAY's law |
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| 8757. |
Simple microscope. |
Answer» SOLUTION :
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| 8758. |
The amount of force required to produce an acceleration of 1 ms^(-2) in a body of mass……………… is called unit force. |
| Answer» ANSWER :C | |
| 8759. |
___________ defined as the quantity of one disintegration per seconds. |
| Answer» SOLUTION :BECQUEREL (BQ) | |
| 8760. |
If the image formed by a mirror for all positions of the object in front of it is always erect diminished, what type of mirror is it? Draw a ray diagram to justify your answer . Where and why do we generally use this type of mirror? |
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Answer» Solution :CANVEX mirrox always FORMS an erect, virtual and diminishedimage for all positions of the object placed in front of it.  Uses: (i) Convex mirrors are used as rear-VIEW mirrous in vehicles to see the traffic atthe rear side (or back side) because- (i) a convex mirror always produces an eract image of the object, (ii) the image formed in a convex mirror is highly diminished due towhich a convex mirror gives a wide field of view. (ii) Big canvex mirrors are used as 'shop security mirrors' By installing a big canbex mirror at a STRATEGIC point in the shop,the OWNER can keep an eye on the customerto look for thievesand shoplifters among them as canvex mirrors always form a virtual, diminished and erect image. |
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| 8761. |
A person has a defect of eye vision. His near point is 40 cm. It means … |
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Answer» he cannot clearly see OBJECTS at a distance more than 40 cm from the eye. |
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| 8762. |
Seminal vesicles: |
| Answer» Solution :Secretion of SEMINAL FLUID which forms major portion of semen. NOURISHMENT of sperms. | |
| 8763. |
A calorimeter has mass 80 g and specific heat 0.1 kcal/kg 0 C. It contains 150 g of liquid at40^(@)C having specific heat of 0.6 kcal/kg 0 C. If we drop a piece of ice of mass 20 g at0^(@)C , what will be the temperature of the mixture? |
| Answer» SOLUTION :` 19.7^(@)C` | |
| 8764. |
What are the qualities of an ideal energy source ? |
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Answer» Solution :An ideal energy SOURCE must be : (i) ECONOMICAL (ii) EASILY accessible (iii) smoke/pollution FREE (iv) Easy to store and transport (v) Able to produce a huge amount of heat and energy on burning |
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| 8765. |
The freezing mixture is made by mixing ice and salt. |
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Answer» Solution :1. A freezing mixture is made by mixing ICE and salt to produce temperature that is below the freezing point of water. 2. This mixture ATTAINS a temperature of `-6 ^@C` to `-16 ^@C`. 3. This low temperature is attained as salt ABSORB the heat of the solution and also ABSORBS the melting heat of ice. |
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| 8766. |
Draw a graph between V and I for a conductor by ohm's law ? |
Answer» SOLUTION :
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| 8767. |
The technique used to determine the age of the Earth, fossils , old paintings and monuments is _________. |
| Answer» SOLUTION :RADIO CARBON DATING | |
| 8768. |
The direction of magnetic field developed around a current-carrying conductor can be easily found by the use of |
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Answer» Right-hand thumb RULE. |
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| 8769. |
What are the uses of concave and convex mirrors ? |
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Answer» Solution :Uses of Concave Mirror. 1. Large sized concave mirrors are used to focus solar energy on an object to be heated. Due to a limited amount of oil and gas, the importance of solar cookers can no longer be ignored. 2. Concave mirrors are used as reflectors in car head-lights, search lights, TORCHES and table lamps. 3. Concave mirrors can be used as a shaving mirror. When the concave mirror is placed at a distance less than its focal length from the face, a magnified erect image is produced. Hence any cut or left over hair can easily be observed with the help of a concave mirror. 4. Concave mirrors are used by doctors to concentrate light on ear, nose, throat, etc. Uses of Convex Mirror. Convex mirrors are used in automobiles (e.g., scooters, cars, trucks, buses, etc.) to see large traffic at the back. The advantage of using a convex mirror is that it GIVES a very large field of view of the rear traffic than a plane mirror. The disadvantage of convex mirror is that since the image is always formed between P and F, we cannot accurately judge the distance and speed of the traffic at the back. Usually two mirrors, one plane and the other convex are used to see back traffic. Whereas convex mirrors, on side of vehicle gives wide field of view, plane mirror in FRONT of driver HELPS us in JUDGING the distance and speed of the back traffic. |
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| 8770. |
Explain the experiment of measuring the real and apparent expansion of a liquid with a neat diagram. |
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Answer» Solution :(i) To START with the liquid whose real and APPARENT expansion is to be determined is poured in a container up to a LEVEL. Mark this level as `L_(1)`. (ii) Now, heat the container and the liquid using a burner as shown in the FIGURE INITIALLY, the container receives the thermal energy and it expands. As a result, the volume of the liquid appears to have reduced. Mark this reduced level of liquid as `L_(2)`  On further heating, the thermal energy supplied to the liquid through the container results in the expansion of the liquid. Hence, the level of liquid rises to `L_(3)`. Now, the difference between the levels `L_(1) and L_(3)` called as apparent expansion, and the difference between the levels `L(2) and L_(3)` is called real expansion. The real expansion is always more than that of apparent expansion Real expansion = `L_(1)-L_(2)` Apparent expansion `=L_(2)-L_(1)` |
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| 8771. |
What does the point Zin the above graph denote? |
| Answer» Solution :POINT Z DENOTES temperature at which DENSITY of water is MAXIMUM. | |
| 8772. |
The ______________is to curb the cybercrimes |
| Answer» Solution :The ` UL ( IT ACT 2000) ` is curb the CYBERCRIMES. | |
| 8773. |
State two properties of the image formed by the eye lens on the retina. |
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Answer» Solution :1. IMAGE on the RETINA is real and inverted 2. DinJinished in SIZE. |
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| 8774. |
State the principle of an electric generator. |
| Answer» SOLUTION :Electric GENERATOR is based on the PRINCIPLE of electromagnetic induction, i.e, when a CONDUCTOR is moved perpendicular to magnetic filed or vice versa, an induced current is produced. | |
| 8775. |
Which of the following is a factor affecting the social health ? |
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Answer» EDUCATION |
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| 8777. |
Elementary particles neutron, positron are emitted by _________ radioactivity. |
| Answer» SOLUTION :ARTIFICIAL | |
| 8779. |
What type of cells are lacking in a person whi is colour blind ? |
| Answer» SOLUTION :Cone SHAPED CELLS in retina are LACKING. | |
| 8780. |
A particle experiences constant acceleration for 20 s after starting from rest. If it travels a distance X_(1), in the first 10 s and distance X_(2), in the remaining 10s, then which of the following is true? |
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Answer» `X_(1) = 2X_(2)` |
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| 8781. |
Naphthalene burns with a clean blue flame. |
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Answer» Solution :(1) Naphthalene is an unsaturated COMPOUND. In unsaturated hydrocarbon the proportion of CARBON is larger than that of SATURATED hydrocarbon. As a result, some unburnt carbon particles are also farmed during COMBUSTION of unsaturated compounds. (2) In the flame, these unburnt hot carbon particles emit yellow light and therefore the flame appears yellow. HENCE, naphthalene burns with a yellow flame. |
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| 8782. |
State the rules used fro drawing ray diagrams for the formation of an image by a concave lens. |
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Answer» Solution :i. When the incident ray is PARALLEL to the principal AXIS, the refracted ray when EXTENDED backwards, passes through the focus. II. When the incident ray passes through the principal focus, the refracted ray is parallel to the principal axis. |
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| 8783. |
A stone is dropped from the top of a tower and travels 24.5 m in the last second of its journey. Then the height of the tower is |
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Answer» 44.1 m |
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| 8784. |
What is gram atomic mass? Given example. |
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Answer» Solution : If the atomic MASS of an ELEMENT is EXPRESSED in grams. It is known as gram atomic mass. Eg. Gram atomic mass of hydrogen= 1 g Gram atomic mass of OXYGEN = 16 g |
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| 8785. |
________ chain reaction is used in atom bomb to produce an explosion. |
| Answer» SOLUTION :UNCONTROLLED | |
| 8786. |
Make a list of comventional and non-conventional energy sources. Give a brief description of harnessing one non -conventional energy source. |
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Answer» Solution :Conventional Energy sources: • Fossil fuels`""` • Hydroelectric power plant • Thermal power plant `""`Biomass Non-conventional energy sources: • Solar energy `""` • Tidal energy • Nuclear energy `""` • Ocean thermal energy Harnessing nuclear energy : Nuclear energy is a non-conventional energy source and can be harnessed by nuclear fission. The nucleus of a heavy atom (such as uranium, plutonium, or thorium), when bombarded with low-energy neutrons, can be SPLIT into lghter nuclei. VHEN done, a tremendous AMOUNT of energy is released if the mass of the orginal nuceus is just a litcle more than the sum of the masses of the individual products. The fission of an atom of uranium, for example, produces 10 million times the energy produced by the combustion of an atom of carbon from coal. In a nuclear reactor designed for electric power generation, such a nuclear .fuel. can be PART of a self-sustaining fission chain reaction that releases energy at a controlled rate. The released energy can be used to produce steam and further generate electricity. |
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| 8787. |
The fuse wire should have a ............ . |
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Answer» LOW MELTING POINT |
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| 8788. |
What are the objectives of mock drill? |
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Answer» Solution :Objectives of Mock Drill : (1) To evaluate the RESPONSE of the people to the disaster. (2) To improve the coordination between various departments of disaster control. (3) To identify ONE's own abilities if disaster approaches. (4) To improve the ability of quick response to disaster and taking rapid action. (5) To check the competency of the PLANNED actions. (6) To identify the possible errors and risks while dealing with disasters. |
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| 8789. |
In the circuit given below, the instrument B reads 0.93 and the instrument A reads 1.80 in their respective SI units. The value of unknown resistor will be : |
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Answer» `0. 51 OMEGA` |
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| 8790. |
Which region of the alimentary canal absorbs the digested food ? |
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Answer» STOMACH |
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| 8791. |
A convex lens produces a real and inverted image 2.5 times maganified at a distance of 25 cm from the lens. Calcuate the focal length of the lens. |
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Answer» SOLUTION :Given : Magnification = 2.5 (Real image) Distance ofthe image (v) = 25 cm To find : Distance of the object (u) Focal LENGTH (f) Solution : M = `(h_(2))/(h_(1))` -2.5 =` 25/(h_(1)) ` `h_1 = -10` `therefore` Distance of the object = 10 cm . `1/v - 1/u = 1/f ` `1/25 - 1/-10 = 1/f ` `1/25 + 1/10 = 1/f ` `1/f = (2+5)/50` `1/f = 7/50` `f = 50/7 ` f = 7.14 cm |
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| 8792. |
At the time of short circuit , thecurrent in the circuit…… |
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Answer» reducessubstantially |
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| 8793. |
A stone thrown vertically upwards with initial velocity u reaches a height h before coming down. Show that the time taken to go up is same as the time taken to come down. |
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Answer» Solution :When OBJECT is THROWN up INITIAL velocity `=um//s`  Final velocity`=0m//s` Acceleration`==gm//s^(2)` Time taken to go up `=t_(1)` According to 1st EQ.of motion `v=u+"GT"` `0=u-"gt"_(1)` `"gt"_(1)=u` `t_(1)=u/g(s)`.....i when object falls down. Initial velocity `=0m//s` Final velocity `(v)=um//s` Acceleration `=gm//s^(2)` Time taken to go down `=t_(2)` According to 1st eq. of motion `v=u+"gt"` `u=0+"gt"_(2)` `t_(2)=u/t(s)`.........ii `t_(1)=t_(2)` 
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| 8794. |
Take down Fig. on to your answer book and complete the path of the ray. |
Answer» Solution :The ray incident on the CONCAVE LENS in a direction parallel to principal axis diverges on passing through the lens, appearing to COME from principal focus F of the lens on left SIDE as shown in Fig. 
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| 8796. |
List three factors which can cause overloading of domestic electric circuits. |
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Answer» Solution :Three factors which can cause ovedoading are : (i) When the live wire and the neutral wire COME into direct CONTACT. (II) Accidental HIKE in the supply voltage. (iii)By connecting too many appliances to a single SOCKET. |
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| 8797. |
The nature of graph of P versus ((1)/(V)) for given mass of gas at constant temperature is ......... |
| Answer» SOLUTION :STRAIGHT LINE | |
| 8798. |
The radius of curvature of a concave mirror is 50 cm. Where should an object be placed from the mirror so as to form its image at infinity ? |
| Answer» Solution :`because` Radius of curvature of mirror R = 50 cm, focal length `f = (R)/(2)` = 25 cm. To form an IMAGE at infinity the object should be placed at focus point i.e., 25 cm from the mirror. | |
| 8799. |
(a) Light enters from air to glass having refractive index of 1.50. What is the speed of light in glass? The speed of light in vacuum is 3xx10^(8)ms^(-1). (b) An object is situated at a position in between the main focus (F) and 2F of a convex lens. Draw the ray diagram showing the position, size and nature of image formed. |
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Answer» Solution :(a) We know Refractive Index, `MU=("Velocity of Light in Vacuum")/("Velocity of Light in Glass")` We are given, refractive index of glass = 1.50 Velocity of Light in vacuum = `3xx10^(8)ms^(-1)` `therefore1.50=(3xx10^(8))/("Velocity of Light in Glass")` Velocity of Light in glass = `(3xx10^(8))/(1.50)=2xx10^(8)ms^(-1)` (b) When the OBJECT is placed between F and 2F the image FORMED is real and inverted. The diagram is as given below  The size of the image DEPENDS upon exact position of the object. The position is between F and 2F. |
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| 8800. |
The free electrons of a metal |
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Answer» do not collide with each other |
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