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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.
| 7351. |
Which is the following is not an axample of colloid …….. |
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Answer» milk |
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| 7352. |
Locomotion is considered as an important characteristics of the animals . However , animalsbelonging to Porifera are said to be sedentary . Every other phylum has typical locomotory organs E.g. Nereis crawls with the help of parapodia , whereas earthworm buries in soil by setae . Spiders have four pairs of walking legs, crab has five while all insects have three pairs of walking legs. The walking legs are also called appendages . Starfish moves with the help of tube feet. Snails and bivalves use muscular foot for locomotion . Birds flying with their spread out wings and fish swimming such body offers least resistance during locomotion . Mammals have two pairs of limbs while animals like snakes are limbless. Other animals belonging like snake are limbless. Other animals belonging to the class of snakes also have very weak limbs which make them creep on the ground. What are the locomotory organs in phylum Annelida ? |
| Answer» SOLUTION :Annelidans have PARAPODIA and SETAE as the LOCOMOTORY ORGANS. | |
| 7353. |
Gamma radiations are dangerous because _____________. |
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Answer» it AFFECTS EYES & bones |
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| 7354. |
A calorie is a unit of heat or energy and it equals about 4.2 J, where 1 J = 1 kg m^(2) s^(-2). Suppose we employ a system of units in which the unit of mass equals alpha kg, the unit of length equals is beta m , the unit oftime is gamma s. Show tthat a calorie has a magnitude 4.2 alpha^(-1) beta^(-1) gamma^(2) in terms of the new units. |
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Answer» SOLUTION :`n_(2)=n_(1)[(M_(1))/(M_(2))]^(a)((L_(1))/(L_(2)))^(B)((T_(1))/(T_(2)))^(c)` `=4.2((kg)/(alphakg))^(1)((m)/(BETAM))^(2)((s)/(gammas))^(-2)` `n_(2)=4.2alpha^(-1)beta^(-2)gamma^(2)` |
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| 7355. |
Draw a concept diagram to show sex determination in human being . |
Answer» SOLUTION :
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| 7356. |
State whether a magnetic field is associated or not around. (i) A static charge (ii) A moving charge (iii) Current carrying conductor. |
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Answer» SOLUTION :(i)A STATIC charge is not associated with a magnetic FIELD around it. (II) A moving charge is associated with a magnetic field around it. (iii) A current CARRYING conductor is associated with a magnetic field around it. |
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| 7357. |
Sundarban sanctuary : West Bental ::Manas sanctuary :"__________" |
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Answer» SOLUTION :Assam. Sundarban sanctuary is located in WEST BENGAL, WHEREAS Manas sanctuary is located in Assam. |
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| 7358. |
A helicopter of mass 2000 kg rises with a vertical acceleration of 15 m//s^2. The total mass of the crew and passengers is 500 kg. Give the magnitude and direction of the : Action of the rotor of the helicopter on the surrounding air. |
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Answer» Solution :Action of rotor of helicopter on SURROUNDING air is OBVIOUSLY vertically downwards, because helicopter rises on account of reaction of this FORCE. Thus force of action = (2000 + 500) (10 + 15) `= 2500 xx 25` = 62,500 N |
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| 7359. |
An electric heater of power kW is used for 10 h.How much energy does it consume?Express your answer in (i)kWh, (ii)joule . |
| Answer» SOLUTION :(i)30 kWh, (II)`1.08 xx 10^(8) J` | |
| 7360. |
A helicopter of mass 2000 kg rises with a vertical acceleration of 15 m//s^2. The total mass of the crew and passengers is 500 kg. Give the magnitude and direction of the : Force on the floor of the helicopter by the crew and passenger. |
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Answer» SOLUTION :Force on the floor of the HELICOPTER by the crew and passengers = APPARENT WEIGHT of crew and passengers =500(10+15) =12500N |
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| 7361. |
A helicopter of mass 2000 kg rises with a vertical acceleration of 15 m//s^2. The total mass of the crew and passengers is 500 kg. Give the magnitude and direction of the : Force on the helicopter due to the surrounding air ( =10"m/s"^2). |
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Answer» Solution :FORCE on the HELICOPTER due to surrounding AIR is obviously a reaction. As action and reaction are equal and OPPOSITE, therefore Force of reaction F´ =62,500 vertically upwards. |
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| 7362. |
Phylum Plathyhelminthes and Phylum Aschelminthes . |
Answer» SOLUTION :
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| 7363. |
A rocket works on the principle of |
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Answer» CONSERVATION of MASS |
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| 7364. |
Whichof thefollowingrepresents1 amu? |
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Answer» MASS of a C-12 ATOM |
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| 7365. |
Anahat is an eight year old girl who has just begun to learn swimming. At the moment she is in the swimming pool. Suddenly, Anahat finds that her earring has fallen into the water. It appears to her that the earring has not gone too deep. So, she begins to go further into swimming pool to retrieve her earring. Her trainer, who has been watching her movements, does not allow Anahat to go further and pulls her out of the swimming pool quickly. (a) Why does it appear to Anahat that her earring has not gone too deep in water ? Name the phenomenon involved. (b) Why does the trainer not allow Anahat to go further in the swimming pool ? (c) Give one example of the effect of phenomenon involved in the above episode in which a glass slab is used. (d) What values does the trainer show in the above episode ? |
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Answer» Solution :(a) The Phenomenon involved is REFRACTION of light. Due to refraction of light coming out through the water of swimming pool into air, the bottom of swimming pool appears raised. In other words, the swimming pool appears to be LESS deep to Anahat than it really is. Due to this, Anahat thinks that her EARRING has not gone too deep in water and tries to retrieve it. (b) The trainer does not allow Anahat to go further in the swimming pool because the water there is much deeper than it appears to be and there is a risk of drowning (c) Due to refraction of light, when a glass slab is placed over some printed matter, the letters appear to be raised when viewed from top. (d) The trainer shows the values of (i) Sense of DUTY (ii) Concern for the safety of children, and (iv) TIMELY action. |
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| 7366. |
The centre of mass of an object is the point inside or outside the object at which the total mass of the object can be assumed to be concentrated. The centre of mass of spherical object having uniform density is a its geometrical centre. The centre of mass of any object having uniform density is at its centroid. Where is the centre of mass located for a spherical object? |
| Answer» SOLUTION :At its GEOMETRICAL CENTRE. | |
| 7367. |
The centre of mass of an object is the point inside or outside the object at which the total mass of the object can be assumed to be concentrated. The centre of mass of spherical object having uniform density is a its geometrical centre. The centre of mass of any object having uniform density is at its centroid. Where can the total mass of an object be assumed to be concentrated? |
| Answer» SOLUTION :At the CENTRE of the MASS of OBJECT. | |
| 7368. |
The centre of mass of an object is the point inside or outside the object at which the total mass of the object can be assumed to be concentrated. The centre of mass of spherical object having uniform density is a its geometrical centre. The centre of mass of any object having uniform density is at its centroid. Where is the centre of mass located for an object of uniform density? |
| Answer» SOLUTION :At its CENTROID. | |
| 7369. |
If you keep ice at 0^(@)C and water at 0^(@)C in either of your hands , in which hand you will feel more chillness ? Why ? |
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Answer» Solution :We will feel more chillness in the hand ICE is PLACED at `0^(@)C` latent heat absorbed by the ice is greater than that absorbed by water. Reason: The latent heat of vaporization absorbed by the ice is greater than water, at the same TEMPERATURE. |
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| 7370. |
The centre of mass of an object is the point inside or outside the object at which the total mass of the object can be assumed to be concentrated. The centre of mass of spherical object having uniform density is a its geometrical centre. The centre of mass of any object having uniform density is at its centroid. What was basis of Kepler's laws? |
| Answer» SOLUTION :At its GEOMETRICAL CENTRE. | |
| 7371. |
List the factors on which the resistance of a cylindrical conductor depends and hence write an expression for its resistance. (b) How will the resistivity of a conductor change when its length is tripled by stretching it? |
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Answer» Solution :The RESISTANCE of a cylindrical conductor i.e., a wire ( R) is (i) directly proportional to its length L, (ii) inversely proportional to its cross section area A and (iii) depends on the nature of material of wire MATHEMATICALLY, `R prop L/A or R=(rho.L)/A` Here , p is known as the resistivity of given material . It is defined as the resistance offered by a unit cube of given material when current flows PERPENDICULAR to the opposite FACES. |
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| 7373. |
The person breaching the EnvironmentalConservation Act is entitled for either one year imprisonment or fine up to $ 5 lakh. True/False |
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Answer» |
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| 7374. |
below shows a uniform metre rule AB pivoted at its end A at the zero mark and supported at the other end B by a spring balance when a weight of 40kgf is suspended at its 40cm mark. This rule stays horizontal . Find the reading of the spring balance when the rule is of (i) negligible mass (ii) mass 20kg. |
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Answer» Solution :When the rule is of negligible mass IN the absence of SUPPORT at the END B by the spring balance, the rule will turn clockwise about the pivot A due to weight 40 kgf at the 40cm mark. To KEEP the rule in equilibrium (i.e., horizontal)a FORCE F(say) is needed upwards at the end B as shown in Fig. 1.24 which is provided by the spring balance. So the reading of the spring balance will be F.  In equilibrium as shown in fig 1.23 clockwise moment about the point A = ANticlockwise moment about the point A or `40 kgf times 40cm= F times 100CM` `therefore F= (40 times 40)/100 kgf= 16 kgf` Thus the reading of spring balance will be 16kgf. (ii) When the rule is of mass 20kg i.e., weight 20kgf. The weight 20 kgf of the rule will act at the 50cm mark, since the metre rule is uniform. As shown in FIg.1.25, both the weight 40kgf and the weight of rule 20kgfproduce clockwise moments about the point A, so a force F is needed upwards at the end B to keep the rule horizontal.  In equilibrium as shown in Fig.1.23, Total clockwise moment about the point A = Anticlockwise moment about the point A or `40kgf times 40cm +20kgf times 50cm` `=F times 100cm` or `F= ((40 times 40)+(20 times 50))/100 kgf=26 kgf` Thus the reading of spring balance will be 26 kgf. |
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| 7375. |
Figure shows electric field lines in which an electric dipole P is placed as shown. Which of the following statements is correct? |
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Answer» The dipole will not EXPERIENCE any FORCE |
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| 7376. |
Collecting information about intensity of disaster and probable sites of disasters is a part of post disaster management. |
| Answer» Solution :COLLECTING INFORMATION about intensity of disaster and PROBABLE sites of disasters is a part of pre-disaster management. | |
| 7377. |
On whichprincipledoes theelectricgeneratorwork ? |
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Answer» ELECTRICAL ENERGY is CONVERTED into HEAT . |
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| 7378. |
If a convex lens of focal length 10 cm and a concave lens of focal length 50 cmare keptin contact with each other , (i) what will be the focal length of the combination ? (ii) What will be the power of the combination? (iii)What will be the behaviour ofthe combination ( behaviour as a convex lens / concavelens ) ? |
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Answer» Solution :` f_(2) = - 50 cm` = - 0.5 m ( concavelens ) , f ( combination ) = ? P ( combination ) = ? (i) ` 1/f = 1/f_(1) + 1/f_(2) = 1/( 0.1 m) + 1/( - 0.5 m) = 10/m - 2/m = 8/m` ` f = 1/8 m = `0.125 m = 12.5 cm The focal LENGTH of the combination of the LENSES= 0.125 m= 12.5 cm. (ii) ` P _(1) = 1/f_(1) = 1/(0.1m) = 10 D, P_(2) = 1/f_(2) = 1/(-0.5 m) = -2 D ` ` therefore P = P_(1) + P_(2) = 10 D - 2D = 8 D ` ` P= 1/f = 1/( 0.125 m) = 8 D ` The power of the combination of the lenses = 8 D (iii) The focal length of the combination of the lenses is positive. This shows that the combination will behave as a convexlens. |
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| 7379. |
Draw a ray diagram to show that path of the refracted ray ineach of the following cases: A ray of light incident on a concave lens is (i) passing through its optical centre. (ii) parallel to its principal axis. (iii) directed towards its principal focus. |
Answer» SOLUTION : 
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| 7380. |
If an electric bulb gives light for 1hour while carrying 0.5A current, how much electric charge passes through it and how many electrons pass through it during this time? (e = 1.6 xx 10^(-19) C) |
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Answer» SOLUTION :`Q = 1800 C`. `n = 1.125 XX 10^22` |
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| 7381. |
The mirror used in search lights is |
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Answer» concave |
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| 7382. |
An aircraft is flying at a height of 3400 m above the ground. If the angle subtended at a ground observation point by the aircraft position 10 second apart is 30°, what is the speed of the aircraft ? |
| Answer» SOLUTION :SPEED `= 182.2 MS^(-1)` | |
| 7383. |
The effective resistance between AB in the given circuit. . . . . . . . . |
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Answer» `1/4Omega` |
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| 7384. |
A fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf by applying an effort at a distance of 15 cm from the fulcrum. Find : (i) the mechanical advantage of the togns, and (ii) the effort needed. |
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Answer» (II) 2.0 KGF. |
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| 7385. |
A ball is thrown up with certain velocity. It attains a height of 40 m and comes back to the thrower . Then the |
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Answer» TOTAL DISTANCE covered by it is 40m |
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| 7386. |
At what tempreature will the velocity of sound in air be double the velocity of sound in air at 0^(@)C? |
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Answer» SOLUTION :Let `T^(@)C` be the required temperature. Let `v_(1)` and `v_(2)` be the velocity of SOUND at temperatures `T_(1)K` and`T_(2)K` respectively. `T_(1)273K(0^(@)C)` and `T_(2)=(T^(@)C+273)K` `(v_(2))/(v_(1))=sqrt((273+T)/(273))=2` Here it is given that, `v_(2)//v_(1)=2` So, `(273+T)/(273)=4` `T=(273xx4)-273=819^(@)C` |
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| 7387. |
The valueof 'g' is maximum at the equatorial region and minimum in the polarregion . |
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Answer» |
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| 7388. |
State Soddy and Fajan's displacement law. |
| Answer» SOLUTION :During a RADIOACTIVE DISINTEGRATION, the nucleus which undergoes disintegration is called a parent nucleus and that which remains after the disintegration is called DAUGHTER nucleus, | |
| 7389. |
Identify the type of disaster. i. Terrorism ii. Soil erosion iii. Hepatitis iv. Forest fire v. Famine vi. Theft |
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Answer» Solution :i. Terrorism: Intentional, man made disaster II. Soil Erosion: Geological disaster III. Hepatitis: Biological disaster CAUSED by viruses iv. Forest fire: Biological disaster related to plants. It can also be classified as man-made disaster in certain cases. V. Famine: Dry famineor drought is a type ofatmosphere, geophysical disaster VI. Theft: Intentiona, man-made disaster. |
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| 7390. |
Street lights, Torch, Solar cooker, Table lamp. |
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Answer» |
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| 7391. |
A 10 mm long awl pin in placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is |
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Answer» `-30` cm So, `(1)/(F) = (1)/(v) + (1)/(u) = (1)/((-30)) + (1)/((-60)) = - (1)/(20) RARR f = -20` cm |
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| 7392. |
b.Concave lens and Convex Lens. |
Answer» SOLUTION : 
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| 7393. |
What type of seeds are used in experiment to show that CO_(2)is given out during respiration ? |
| Answer» Solution : To SHOW that `CO_(2)` is GIVEN out during respiration germinating seeds are USER because they produce `CO_(2)`. GAS. | |
| 7394. |
Certain scavenging caterpillars, termites and insects found in the dung are important. |
| Answer» Solution :(1) Scavenging caterpillarsand insects are decomposers. They seem to be worthless due to filthy surrounding in which they thrive. (2) But they CARRY out most important task of DECOMPOSITIONOF COMPLEX organic substances into simple inorganicelements. (3) This recycling is possible only due to decomposers. (4)It they are not present, there will be huge accumulation ofgarbage . Therefore, these living organisms are important. | |
| 7395. |
Rakesh performs the experiments on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He observes that in all cases |
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Answer» `angle i gtangle R " but " angle i = angle E` |
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| 7397. |
A rayof lightmakesan angleof 50 ^(@)withthesurfaceS,of theglassslab. Itsangle ofincidencewil be________. |
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Answer» `50^(@)` |
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| 7398. |
In Japan, some of the new born children are having congenital diseases . Why ? |
| Answer» Solution :During the Second World War AMERICAN bomber dropped the NUCLEAR weapons over the Japanese Cities of Hiroshima and Nagasaki. In the explosion of the ATOMIC bomb to releae the high energy dangerous radiation. In the explosion period Japanese peoples are affected by the radiation. This is reason in Japan, some of the new born CHILDREN are having congential diseases. | |
| 7399. |
Two elements X and Y have atomic numbers 12 and 16 respectively. Two which period of the Modern Periodic Table do these two elements belong ? What type of bond will be formed between them and why ? Also give the chemical formula of the compound formed. |
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Answer» Solution :• Electronic CONFIGURATION of X : 2, 8, 2. • Electronic configuration of Y : 2, 8, 6. • Both the elements belong to third GROUP. • Ionic bond will be formed between the two. Reason : X has a tendency to lose two electrons and Y has a tendency to GAIN two electrons to complete their octet. • Chemical formula of the compound : XY |
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| 7400. |
A convergent beam of ligh passes through a diverging lens of focal length 0.2 meters comes to focus at a distance 0.3 meters behind the lens find the position of the point at which the beam would converge in the absence of lens? |
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Answer» Solution :F=-0.2m, v=0.3m From the LENS EQUATION 1/f=1/v-1/u 1/u=1/v-1/f=1/0.3-1/-0.2=50/6 U=6/50=0.12m In the absence of lens the beam WOULD converge at a DISTANCE 0.12m from the present position of the lens. |
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