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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.
| 2651. |
China wares are wrapped in straw paper before packing. Why ? |
| Answer» Solution :The straw paper between the China ware increases the TIME of EXPERIENCING the jerk during transportation. Hence impact of force REDUCES on China WARES. | |
| 2652. |
In Figure, a ray of light A incident from air suffers partial reflection and refraction at the boundary of water. (a) Complete the diagram showing (i) the reflected ray B and (ii) the refracted ray C. (b) How are the angles of incidence i and refraction r related ? |
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| 2653. |
Why are magnetic field lines more crowded towards the pole of a magnet ? |
| Answer» Solution :Magnetic FIELD lines are more CROWDED towards the POLE of a magnet because of STRONG force of ATTRACTION. | |
| 2654. |
Moseley's periodic table is based on atomic mass . |
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Answer» Solution :1.False Correct statement : Moseley.s periodic table is BASED on atomic number. 2.False Correct statement: An ALLOY is a homogeneous mixture of TWO or more metals or of one or more metals with CERTAIN non-metallic elements. |
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| 2655. |
How do OTEC power plants operate? |
| Answer» Solution :Ocean-thermal-enerey CONVERSION [OTEC) Power plants harness energy due to ditference in TEMPERATURE at sea surface and at depths of up to 2000 metres or so. In one form of OTEC, the WARM surface WATER is used to boil a low-boilling LIQUID like ammonia or a chlorofluorocarbon. The vapours of the liquid are sent to move the turbines of a generator. The cold water from the depths are used to condense the vapours escaping from turbines. To use this plant a difference of `20^(@)` C or more is required between the temperature of water surfaces, shallow and deep. | |
| 2656. |
i) Write the difference between homologous organs and analogous organs. ii) Write the difference between the sex chomosomes of man and sex chromosomes of woman. iii) Sex of a child is determined by the father how ? |
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Answer» Solution :Difference between homologous analogous. Homologous ORGANS *Organs of DIFFERENT organisms have common origin. *They have similar structure and PERFORM different function. * Ex. Forelimbs of frog and forelimbs of bird, Analogous organs * Organs of different organisms have different origin they have different structure and perform similar function. * Wings of bird and wings of bat. ii) Woman have a perfect pair of SEX chromosomes both called X. Man has a normal sized chromosome X and another shortsized chromosome Y. iii) A child who inherits X chromosome from her father will be a girl and child who inherits Y chromosome from his father will be a boy both the girl and the boy inherit only X chromosomes from the MOTHER therefore sex of a child is determined by the father. |
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| 2657. |
What kind of mirror - concave, convex or plain - would be best suited foruse in a solar cooker? Why? |
| Answer» Solution :A concave mirror reflector would be best suited for use in a solar cooker. This is because a concave reflector converges a large amount of sun's heat rays to a SMALL AREA at its focus DUE to which a high temperature is produced in its focus area (which is suitable for baking and frying). such a high temperature cannot be ACHIEVED in a solar cooker by using a plane mirror reflector. Convex mirror reflector, being a diverging mirror, cannot be USED at all in a solar cooker. | |
| 2658. |
The mean orbital radius of the earth around the sun is 1.5xx10^(8) km. Calculate mass of the sun if G=6.67xx10^(-11)Nm^2"/"kg^(-2)? |
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Answer» SOLUTION :`R= 1.5xx10^(8) km = 1.5xx10^(11)m` T= 365 DAYS `=365xx24xx3600s` Centripetal force = gravitational force `(Mv^2)/(R )= (GMm)/(R^2)= (m)/(R )((2piR)/(T))^2= (GMm)/(R^2)` `M_(s)= (4pi^2R^3)/(GT^2)` `=(4xx9.87xx(1.5xx10^(11))^3)/(6.64xx10^(-11)xx(365xx24xx3600)^2)` `M_(s)=2.01=10^(30)kg`. |
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| 2659. |
What is the difference between virtual image of an object formed by a convex lens and that formed by a concave lens ? |
| Answer» SOLUTION :VIRTUAL image FORMED by a convex LENS is always MAGNIFIED but that formed by a concave lens is diminished one. | |
| 2660. |
A student has to do the experiment on finding the focal length of a given concave mirror by using a distant object. Out of the following 'set-ups' A,B,C and D available to him: A : a screen, a mirror holder and a scale B : a mirror holder, a screen holder and a scale C : a screen holder and a scale D : a mirror holder and a scale The 'set-up' which is likely to give him the best result is : |
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Answer» A |
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| 2661. |
Select the odd one. Solar cells, tidal energy, atomic reactor, Hydroelectric power. |
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| 2662. |
Answer question numbers 3(a) to 3(d) on the basis of your understanding of the following information and related studied concepts.Thyroid gland is a bilobed structure situated in our neck region. It secretes a hormone called thyroxine. Iodine is necessary for the thyroid gland to make thyroxine. Thyroxine regulates carbohydrate, protein and fat metabolism in the body. It promotes growth of body tissues also. When there is an excess of thyroxine in the body, a person suffers from hyperthyroidism and if this gland is underactive it results in hypothyroidism. Hyperthyroidism is diagnosed by blood tests that measure the levels of thyroxine and Thyroid Stimulating Hormone (TSH). Hypothyroidism is caused due to the deficiency of iodine in our diet resulting in a disease called goitre. Iodised salt can be included in our diet to control it.Where is thyroid gland situated in our body ? |
| Answer» Solution :THYROID gland is SITUATED in the neck REGION in our BODY. | |
| 2663. |
A student wants to project the image of a candle flame on a screen 60 cm in front of a mirror by keeping the flame at a distance of 15 cm from its pole. (i) Write the type of mirror he should use. (ii) Find the linear magnification of the image produced. (iii) What is the distance between the object and itsimage? (iv) Draw a ray diagram to show the image formation in this case? |
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Answer» Solution :(i) He should use a CONCAVE mirror, as it forms a real image on the same side of the mirror. (ii) Object distace u=-15 CM Image distacne v=-60cm Magnification `m=-v//u=-(-60)//(-15)=-4cm` The MINUS sign in magnification shows that the image formed is real and INVERTED. (iii) The image is formed at a distance of 45 cm from the object.  In this case the image is formed beyond the centre of curvature. This image is real inverted nad enlarged. |
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| 2664. |
State two positions in which a concave mirror produces a magnified of a given object. List two differences between the two images. OR List two possible ways in which a concave mirror can produce a magnified image of an object placed in front of it. State the difference if any betweenthese two images. |
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Answer» Solution :(i) When the OBJECT is placed in front of the mirror: a. between its pole and focus. B. between the focus and centre of CURVATURE. (II) In case a the IMAGE is virtual and erect. in case (b) the image is reasl and inverted. |
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| 2666. |
A single fixed pulley and a movable pulley both are separately used to lift a load of 50 kgf to the same height. Compare the efforts applied |
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| 2667. |
Answer question numbers 3(a) to 3(d) on the basis of your understanding of the following information and related studied concepts.Thyroid gland is a bilobed structure situated in our neck region. It secretes a hormone called thyroxine. Iodine is necessary for the thyroid gland to make thyroxine. Thyroxine regulates carbohydrate, protein and fat metabolism in the body. It promotes growth of body tissues also. When there is an excess of thyroxine in the body, a person suffers from hyperthyroidism and if this gland is underactive it results in hypothyroidism. Hyperthyroidism is diagnosed by blood tests that measure the levels of thyroxine and Thyroid Stimulating Hormone (TSH). Hypothyroidism is caused due to the deficiency of iodine in our diet resulting in a disease called goitre. Iodised salt can be included in our diet to control it.State the function of thyroxine in human body. |
| Answer» Solution :THYROXINE regulates our BMR (Basal Metabolism RATE) i.e., carbohydrate, proteins and fat metabolism in our BODY. | |
| 2668. |
Answer question numbers 3(a) to 3(d) on the basis of your understanding of the following information and related studied concepts.Thyroid gland is a bilobed structure situated in our neck region. It secretes a hormone called thyroxine. Iodine is necessary for the thyroid gland to make thyroxine. Thyroxine regulates carbohydrate, protein and fat metabolism in the body. It promotes growth of body tissues also. When there is an excess of thyroxine in the body, a person suffers from hyperthyroidism and if this gland is underactive it results in hypothyroidism. Hyperthyroidism is diagnosed by blood tests that measure the levels of thyroxine and Thyroid Stimulating Hormone (TSH). Hypothyroidism is caused due to the deficiency of iodine in our diet resulting in a disease called goitre. Iodised salt can be included in our diet to control it.What is hyperthyroidism ? |
| Answer» SOLUTION :EXCESS SECRETION of HORMONE | |
| 2669. |
The distance (5) travelled varies with time (t) for four different-bodies as given below. In which case is the acceleration of the body is minimum? |
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| 2670. |
Answer question numbers 3(a) to 3(d) on the basis of your understanding of the following information and related studied concepts.Thyroid gland is a bilobed structure situated in our neck region. It secretes a hormone called thyroxine. Iodine is necessary for the thyroid gland to make thyroxine. Thyroxine regulates carbohydrate, protein and fat metabolism in the body. It promotes growth of body tissues also. When there is an excess of thyroxine in the body, a person suffers from hyperthyroidism and if this gland is underactive it results in hypothyroidism. Hyperthyroidism is diagnosed by blood tests that measure the levels of thyroxine and Thyroid Stimulating Hormone (TSH). Hypothyroidism is caused due to the deficiency of iodine in our diet resulting in a disease called goitre. Iodised salt can be included in our diet to control it.How can we control hypothyroidism ? |
| Answer» Solution :By adding iodine in our diet. For EXAMPLE, by consuming iodised SALT or sea FOOD. | |
| 2671. |
The difference between U^(235 ) and U^(238)atoms is that U^(238) contains |
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Answer» 3 more PROTONS |
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| 2672. |
The refractive index of water is: |
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Answer» 1.33 |
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| 2673. |
When a sound wave travels through air, the air particles …………… |
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Answer» VIBRATE ALONG the DIRECTION of the WAVE motion |
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| 2674. |
(a) Name the part of a bisexual flower that produces male and female germ cells. (b) Draw a longitudinal section of the female reproductive part of a flower showing germination of pollen grain. Label -(i) Stigma, (ii) Pollen tube with germ cells, (iii) Female germ cells, (iv) style (c) Name the part of flower that develops into a (i) seed and (ii) fruit |
| Answer» Solution :(a) Anther=male germ cells, ovary =FEMALE germ cell , (C) OVULE `rArr` SEEDS , Ovary `rArr`=FRUIT | |
| 2675. |
A person needs a lens of power -5.5 dioptres for correcting his distant vision, for correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distant vision and (ii) near vision ? |
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Answer» Solution :(i) For distant vision, given : Power of the LENS , `P_(1) = -5.5 D`. FOCAL length, `f = (1)/(P_(1)) = (1)/(-5.5) = 0.1873m = -18.73 cm` (II) For near vision, power is measured relative to the main PART of the lens. Therefore, `P_(1) + P_(2) = P` or `-5.5 + P_(2) = + 1.5` or `P_(2) = +7D` Focal length, `f = (1)/(P_(2)) = (1)/(+6.5)` |
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| 2676. |
Explain the construction and working of the following. Draw a neat diagram and label it. (i.)Electric motor |
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Answer» Solution :Electric motor: It is a device which converts electrical energy into mechanical energy. Construction: Electric motor consists of following parts: (a.) RECTANGULAR coil: A large number of turns of insulated copper wire wound on iron core in rectangular shape forms a coil ABCD as shown in figure. (b.) Strong magnet: The coil is placed in between two POLE pieces (N and S) of a strong horse shoe magnet which provides a strong magnetic field. The sides AB and CD are perpendicular to the direction of magnetic field. (c.) SPLIT ring: It consists of two halves of a metallic ring `(R_(1) and R_(2))`. The ends of the coil are connected to these rings. The outer conducting surfaces of spilt rings `R_(1) and R_(2)` are in contact with the two stationary carbon brushes. Spilt rings reverse the direction of current in the coil. (d.) Brushes: Two carbon brushes `B_(1) and B_(2)` are used to press the split rings. (e.) Axle: The two halves of the rings have resistive coating in their inner surfaces and are tightly fitted on the axle. The main function of axle is to rotate with the coil. (f.) Battery: The battery SUPPLIES the current to the coil.  Working: (a.) When the circuit is completed, the current passes through the brush `B_(1)` from A to B in branch AB. (b.) As, the magnetic field acts from north pole to south pole, according to Fleming's left hand rule, the force experienced by arm AB is in the downward direction and arm CD is in the upward direction. (c.) Both these forces are equal in magnitude and opposite in direction and hence, the coil rotates in anticlockwise direction. (d.) After half rotation, the split rings `R_(2) and R_(1)` come in contact with brushes `B_(1) and B_(2)` respectively. (e.) Again the current starts passing through the coil in opposite direction. (f.) The force acting on branch BA is upward and DC is downward, this force again moves the coil in anticlockwise direction. (g.)This shows that the current in the loop ABCD is reversed after every half rotation, and the loop continues to rotate in same direction. (h.) Thus, the coil rotates with the help of electrical energy. |
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| 2677. |
An object is placed at 10 cm from a convex lens of focal length 12 cm. Find the position, nature and magnification of the image. |
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Answer» Solution :Data : Convex lens `, u=-10 cm`,`f=12 cm , v=?` `1/f=1/v-1/u therefore 1/v=1/f+1/u` `therefore1/v =(1)/(12CM)+(1)/((-10cm))` `=-((1)/(10cm)-(1)/(12cm))` `=-((6-5)/(60cm))=-(1)/(60cm)` `therefore v=-60 cm ` it is negative The image is FORMED at 60 cm from the lens and on the same side of the lens relative OT the OBJECT . It is virtual , ERECT and enlarged. |
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| 2678. |
How will you justify that overcoming the pollution is a powerful way of environmental management ? |
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Answer» Solution :i. Pollution affects the ENVIRONMENT adversely. ii. Environmental pollution is a major concern because of the harmful effects it has on the environment as well as on health of humans. iii. The impact of pollution is SEVERE in developing countries, leading to ill health, health and disabilities in people. Developed countries have powerful ways of environmental management as they have resources as well as technologies to combat pollution. iv. REDUCING pollution will help reduce production of toxic wastes, thereby saving thecost of disposal of wastes. v. The ultimate effect of pollution is on the existence of living ORGANISMS. vi. We as stakeholders of the environmental need to come together to overcome pollution. It will preserve our precious environment resources and improve the environment quality. THUS, overcoming pollution is a powerfulway of environmentmanagement. |
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| 2679. |
Draw ray diagram showing refraction of monocromatic light through a glass prism and hence obtain the relation between refractive index (mu) of the prism and angle of minimum deviation. |
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| 2680. |
The magnetic field inside a long straight solenoid-carrying current. |
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Answer» is zero |
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| 2681. |
Magnetic field lines of two bar magnets A and B are as shown below. Name the poles of the magnets facing each other |
| Answer» SOLUTION : NORTH POLES. | |
| 2682. |
Stars : Point source of light :: Plants :……………… |
| Answer» SOLUTION :Collection of point sources of light : Planets are much CLOSER to US as compared to stars, therefore, they APPEAR as a collection of point sources. | |
| 2683. |
Magnitude of the currentinduced in a circularloop dependson the speed of themagnet movingtowards it . |
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| 2684. |
Which of the following is ecofriendly ? |
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Answer» THERMAL POWER PLANT |
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| 2685. |
Describe and name three stages of cellular respiration that aerobic organisms use to obtain energy from glucose. |
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Answer» SOLUTION :Stages of cellular respiration (i) Glycolysis : It takes place din cytoplasm of the cell. It is the break down of one molecule of glucose (6 Carbon) into two molecules of Pyruvic acid (3 Carbon). `{:("Glucose", to, "Pyruvic acid"),("(1molecule)",,"(2molecules)"),(6"carbon",,3"carbon"):}` (ii) Kreb.s cycle : This occurs in mitochondria matrix . During this cycle, oxidation of pyruvic acid result into `CO_2` and water. `Pyruvic acid overset("Oxidation")(rarr)CO_2 + H_2O` (iii) ELECTRON transport chain (ETC): ETC is located on the inner membrane of the mitochondria. (a) `NADH_2 and FADH_2` molecules formed during Glycolysis and Kreb.s are oxidised to `NAD^(+) and FAD^(+)` to RELEASE the energy via electrons. (b) The electrons, as they move through the system, release energy which is TRAPPED by ADP to synthesize ATP. This is called Oxidative Phosphorylation. During this process, oxygen which is the acceptor of electrons get reduced to water. |
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| 2686. |
Identify my class/phylum and give one example of it : (c) I live in your small intestine , my body is long and thread like and pseudocoelomate. |
| Answer» Solution :Phylum : ASCHELMINTHES , Example : Ascaris or ROUND worm , FILARIAL worm . | |
| 2687. |
Why is a dietry restriction recommended for an obese individual ? |
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Answer» Solution :(a) Obesity is a positive RISK FACTOR in development of hypertension, diabetes, gall bladder DISEASE, coronoary heart disease and arthritis. Hence RESTRICTION is recommended for an obese individual. (b) Triticale (6n) is a HYBRID of wheat and rye. It has higher dietary fibre and protein. |
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| 2688. |
When a battery is connected in a circuit, in the external circuit, electric current flows from the ……………. terminal to the …………... terminal of the battery. |
| Answer» SOLUTION : POSITIVE, NEGATIVE | |
| 2689. |
Students A and B connect the two resistors R_(1) and R_(2) given to them in the manners shown below : and then insert them at X and Y into the measuring circuit shown below : We can then say that |
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Answer» both the students will determine the equivalent resistance of the series combination of `R_(1)` and `R_(2)` |
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| 2690. |
What is the velocity ratio of a single movable pulley ? How does the friction in the pulley bearing affect it ? |
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| 2691. |
Calculate the impulse necessary to stop a 1500 kg car moving at a speed of "25ms"^(-1). |
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| 2692. |
Which of the following statements is correct regarding the propagation of light of different colours of white light in air ? |
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Answer» Red light moves fastest |
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| 2693. |
At noon, the sun appears white as. |
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Answer» light is least SCATTERED |
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| 2694. |
A charge of 150 coulomb flows through a wire in one minute. Find the electric current flowing through it |
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Answer» SOLUTION :CHARGE (Q) = 150 COULOMB Time (t) =1 minute = 60 sec . Current (I) =? `I = (Q)/(t) ` `= (150)/(60)` =2.5 Amp. |
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| 2695. |
The evidence to show that there must be force acting on Earth and directed towards the Sun |
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Answer» phenomenon of day and night |
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| 2696. |
How does the resistance of a wire vary with its, area of cross-section ? |
| Answer» SOLUTION :Resistance is inversely proportional with the cross-sectional AREA of wire `R PROP (1)/(A)` | |
| 2697. |
Name one source of energy which is not derived from solar energy directly or indirectly. |
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| 2698. |
The specific resistance of a rod of copper as compared to that of thin wire of copper is |
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Answer» less |
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| 2699. |
A bird is in a wire cage hanging from a spring balance. The reading of the balance is taken when the bird is flying about in the cage, and when the bird is at rest in the cage. The first reading will be |
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Answer» much greater than the second |
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| 2700. |
Under what conditions is the Ohm.s law applicable? |
| Answer» Solution :The Ohm.s LAW is applicable when the PHYSICAL conditions LIKE temperature, pressure, etc. of a conductor do not CHANGE when a potential DIFFERENCE is applied across it. | |
