InterviewSolution
Saved Bookmarks
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.
| 4552. |
What values did john exhibit? |
|
Answer» Solution :John exhibited few qualities like (1) Helping TEACHER and his peer group (2) Application of Knowledge (3) Presence of mind. (4) A boy is LOOKING at the sun through a convex lens. His brother immediately takes away the lens and explains why he shouldn .t do it. |
|
| 4553. |
According to Newton's law of gravitation, the apple and the earth experience equal and opposite forces due to gravitation. But it is the apple falls towards the earth and not vice-versa. Why? |
|
Answer» SOLUTION :Yes, the apple atrracts the EARTH with equal force but the mass of the apple is much less as compared to that of the Earth. We know `F=ma` or `a=F/m` Hence GREATER the mass, LESSER the acceleration. Therefopre, due to greater mass, the Earth's acceleration is almost zero. |
|
| 4554. |
A student finds that there are 20 divisions between the 0 mark and 1 V mark of a voltmeter. What is the least count of this voltmeter ? |
|
Answer» 0.50 V |
|
| 4555. |
A wheel of diameter 2m is shown in Fig 1.28 with axle at O. At force F= 2N is applied at B in the direction shown in figure, Calculate the moment of force about (i) the centre O, and (ii) the point A. |
| Answer» SOLUTION :(i) 2Nm (CLOCKWISE) (II) 4Nm (clockwise) | |
| 4556. |
i) Write the name given to bases that are highly soluble in water. Give an example. ii) How is tooth decay related to pH. iii) Why does bee - sting cause pain and irratiation? Rubbing of baking soda on the sting area gives relief. How? |
|
Answer» Solution :i) Alkali, NaOH ii)Tooth decay STARTS when the pH of the mouth is LOWER than 5.5. It can be prevented by using toothpaste which are generally BASIC. III) Bee sting has acid that cause pain and irritation Baking soda being alkaline, Neutralises acid and given relief. |
|
| 4557. |
What is acid rain? |
| Answer» SOLUTION :Acid rain : The rain CONTAINING the ACIDIC oxide such as oxide of carbon, NITROGEN and SULPHUR. | |
| 4558. |
A ball is thrown vertically upwards with a velocity of 20 ms^(-1) from the top of a multi-storey building. The height of the point from where the boll is thrown is 25.0m from the ground (a) How high will the ball rise? and (b) How long will it take to reach the ground? |
|
Answer» |
|
| 4559. |
Explain in brief the reason for each of the following : (i) Advanced sun-rise (ii) Delayed sun-set (iii) Twinkling of stars |
|
Answer» Solution :(i) Advanced sun-rise : When the sun is slightly below the horizon, light rays coming from the sun travel from the rarer to DENSER medium layers of air because of atmospheric refraction of light, light appears to come from a higher position above the horizon. Thus the sun appear earlier than actual sun rise. (ii) Delayed sun-set : Same REASON as similar refraction occurs at the sunset.  (iii) TWINKLING of stars : The light coming from the stars gets refracted several times before reaching the OBSERVER.s eye. Due to change in physical condition of the atmosphere the light sometimes REACHES the observer and sometimes it doesn.t, hence they appear to twinkle. |
|
| 4560. |
If water of mass 60 g and temperature50^(@)Cis mixed with water of mass 40g and temperature30^(@)C , what will be the maximum temperature of the mixture ? |
|
Answer» |
|
| 4561. |
Draw a figure explaning various terms related to a lens. |
|
Answer» Solution :1. Principal axis : The imagenary line passing through both centre of curvature is called the principal axis of the lens. 2. OPTICAL centre (O) : The point inside a lens on the principal axis, through which light rays pass wihtout changing their path is called the optical centre of a lens. 3. Principal focus fo convex lens: When the light rays paralled to the principal axis are INCIDENT on a convex lens, they converge to a point on the principal axis. This point is called the principal focus fo convex lens.  4.Principal focus fo CONCAVE lens : Rays travelling paralled to the principal axis of a concave lens, diverge after passing through the lens and appear to be coming out from a point on principal axis. This point is called principal focus of concave lens. 5. Focal length (f) : The distance between the optical centre and principal focus of a lens is called its focal length. (`f_(1) and f_(2)`) Centre of curvature (C): The centre6. s of spheres whose parts form SURFACES of the LENSES are called centres of curvatures of the lenses. `(C_(1) adn (C_(2))`  7. Radius of curvature (r) : The radii of the spheres whose part form surfaces of the lenses are called the radii of curvature of the lens. `(R_(1) and (R_(2))` |
|
| 4562. |
Based on nature and size of the scatter. Classify the scattering. |
|
Answer» SOLUTION :The nature and SIZE of the scatterer results in different types of SCATTERING . They are (i) Rayleigh scattering (ii) Mie scattering (III) Tydall scattering (iv) RAMAN scattering |
|
| 4563. |
Magnification produced by a lens is in the ratio of ……………….. |
|
Answer» |
|
| 4564. |
A difference in electric potential is needed for the flow of electric charges in a ______________. |
| Answer» SOLUTION :CONDUCTOR | |
| 4565. |
State laws of reflection of light. List four characteristics of the image formed by a plane mirror. |
| Answer» Solution :See Point Number 5 and 6 under the HEADING "Chapter At A GLANCE". | |
| 4566. |
Pinkpages of Red list conain the names of previously endangered but presently safe species. |
|
Answer» Solution :FALSE. GREEN PAGES of Red List contain the names of previously endangered but presently safe species. OR PINK pages of Red List contain the names of endangered species. |
|
| 4567. |
A pendulum is oscillaring on either side its rest position.The correct statement is: |
|
Answer» It has the MAXIMUM potential ENERGY at its extreme position. |
|
| 4569. |
In activity 13.7 , how do you think the displacement of the rod AB is affected if [i] current in rod AB is increased, [ii] a stronger horseshoe magnet is used , and [iii] length of the rod AB is increased ? |
|
Answer» Solution :i] When current in ROD AB is increased, FORCE on the conductorincreases. HENCE, thedisplacement of the rodincreases. ii] A STRONGER horseshoe magnet has a stronger magneticfieldand increases thedisplacementof the rod. iii] Since the force on the rod is proportionalto its LENGTH, thedisplacementincreases if the length of therod is increased. |
|
| 4570. |
Greek philosopher Aristotle was the first to perform the animal classification. |
|
Answer» |
|
| 4571. |
Give reason for the following. Sky in the moon appears dark. |
|
Answer» |
|
| 4572. |
_________________:Floods::Pollution:Man-Made disaster. |
|
Answer» SOLUTION :Geophysical DISASTER POLLUTION is a man-made disaster, WHEREAS floods are a geophysical disaster. |
|
| 4573. |
To maintain a rotor at a uniform angular speed of 200 rad s^(-1), an engine needs to transmit a torque of 180 Nm. What is the power required by the engine? Assume that the engine is 100% efficient. |
|
Answer» <P> Solution :Here `omega = 200 rad s^(-1), tau= 180 NM``THEREFORE` Power, `P= tau omega = 180 xx 200 = 36,000 W = 36 kW`. |
|
| 4574. |
When a current 'l' flows through a resistance 'R' for time 't' the electrical energy spent is given by |
|
Answer» lRt |
|
| 4575. |
Among different chordates there are embryological evidences. |
|
Answer» Solution :Evolutionary evidences is ONE of the important concept in evolution. Embryological evidences is one among these: (1) Very young embryos of fish, amphibians, reptiles, birds and mammals show quite similar structure in the early STAGES. (2) As the further growth takes PLACE, they acquire different patterns. (3) The initial similarity between the vertebrate embryos is an evidence that during evolution, there was a common ancestor for all the vertebrate CLASSES. (4) This is CALLED embryological evidence for vertebrate evolution. |
|
| 4576. |
Calculate the pH of sodium hydroxide solution having the concentration of OH^(-) 0.01 ml^(-1). |
|
Answer» SOLUTION :`pOH=-log_(10)[OH^(-)]` `pOH=-log_(10)[1XX10^(-2)]` `pOH=2` `pH+pOH=14` `pH=14-2=12` |
|
| 4577. |
An object of height 2 cm is kept at 30 cm from a convex lens . Its real image is formed at 60 cm from the lens. Find the focal length of power of the lens. |
| Answer» SOLUTION :`f=20 CM, P=5 D` | |
| 4579. |
Force is an external effort in the form of __________ or __________. |
| Answer» SOLUTION :PUSH , PULL | |
| 4580. |
1 Rd is equal to |
|
Answer» `10^(6) "decay"//"SECOND"` |
|
| 4581. |
When resistors of resistances R_1 and R_2 (R_2 lt R_1) are connected in parallel and the currents flowing through them are I_1 and I_2respectively, then ……………. . |
|
Answer» `I_1 =I_2` |
|
| 4582. |
Door peep hole, magnifying glass, kaleidoscope, telescope. |
| Answer» Solution :Kaleidoscope Kaleidoscope uses MIRRORS while other DEVICES MAKE use of LENSES. | |
| 4583. |
Which one of the following pair of quantities has same dimension ? |
|
Answer» FORCE and work done |
|
| 4585. |
From which of the following case, current in the loop will not be induced? |
|
Answer» The loop is MOVED in the direction of the MAGNET |
|
| 4586. |
When a body moves in a circular path ,how much work is done body?Give reason. |
|
Answer» SOLUTION :(The BODY is acted UPON by the CENTRIPETAL force) ZERO |
|
| 4587. |
An electric lamp of 100Omega, a toaster of resistance 50 Omega, and a water filter of resistance 500 Omega are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances and what is the current through it? |
|
Answer» Solution :Here. Resistance of an electric LAMP `R_1 = 100 Omega` Resistance of a toaster `R_2 = 50 Omega` Resistance of a water filter `R_3 =500 Omega` Equivalent resistance `R_p` of THREE resistors `R_1,R_2 and R_3` connected in parallel is given by, `1/R_P = 1/R_1 + 1/R_2 + 1/R_3` `:.1/R_P = 1/100 + 1/50 + 1/500` `= (5 + 10 + 1)/500` `=16/500` `:. R_p = 500/16` `=125/4` `= 31.25 Omega` Total current through the circuit (i.e.. through all the three APPLIANCES) `I = V/R_p` `=220/(31.25)` `= 7.04 A` Since the electric IRON connected to the same SOURCE (Le., 220 V) takes as much current as taken by all the three appliances (Le., I = 7.04 A), its resistance must be equal to `R_p`. So. the resistance of the electric iron = `31.25 Omega` and the current through the electric iron = 7.04 A |
|
| 4588. |
In the above problem, the distance covered by the cyclist would be |
| Answer» ANSWER :A | |
| 4589. |
Which one of the following is used in the treatment of skin diseases….. |
|
Answer» <P>`Na^(24)` |
|
| 4590. |
Explain diphyodont dentition. |
| Answer» Solution :The EXISTENCE of TWO sets of TEETH in the life of an ORGANISM (eg. rabbit) is called diphyodont dentition. The two types of teeth are milk teeth (young ones) and permanent teeth (in ADULTS). | |
| 4591. |
Melting point of solid and boiling point of liquid. |
Answer» SOLUTION :
|
|
| 4592. |
Value of speed of light in vacuum is _____________ m s^(-1) |
|
Answer» |
|
| 4593. |
(i) With the helpof an activity, explain the method of inducing electric current in a coil with a moving magnet. State the rule used to find the direction of electric current thus generated in the coil. (ii) Two circular coils P and Q are kept close to each other, of which coil P carries a current. What will you observe in Q? (a) If current in the coil P is changed? (b) If both the coils are moved in the same direction with the same speed? Give reason. |
|
Answer» Solution :(i) Activity: (a) Take a coil of wire AB havinga large number of turns.  (b) Connect the ENDS of the coil to a galvanometer. (c ) Take a STRONG bar magnet and move its north pole towards the end B of the coil. (d) There is a momentary deflection in the needle of the galvanometer, say to the right. This indicates the presence of a current in the coil AB. The deflection becomes zero the MOMENT the motion of the magnet stops. (E ) Now withdraw the north pole of the magnet away from the coil. Now the galvanometer is deflected toward the left, showing that the current is now sep up in the directionopposite to the first. (f) Place the magnet STATIONARY at a point near to the coil, keeping its north pole towards the end B of the coil. We see that the galvanometer needle deflects toward the right when the coil is moved towards the north pole of the magnet. Similarly, the needle moves toward left when the coil is moved away. When the coil is kept stationary with respect to the magnet, the deflection of the galvanometer drops to zero. To find the direction of electric current Fleming.s right hand rule is applied. According to it, if we stretch the forefinger, middle finger and thumb of our right hand mutually perpendicular in such a way that thumb points along the direction of motion of conductor, forefinger along the direction of magnetic field, then the middle finger points along the direction of induced current. (ii) (a) When current in P is changed, the field associated with Q will vary causing an induced current in Q. (b) If both the coils are moved in the same direction with same speed, there will not be any change in the field associated with Q. Hence no current will be induced in Q. |
|
| 4594. |
How will the momentum of a body change if its kinetic energy is doubled ? |
| Answer» Solution :Momentum BECOMES `SQRT(2)` TIMES. | |
| 4595. |
A wire of given material having length l and area of cross-section A has a resistance of 4 n. What would be the resistance of another wire of the same material having length 1/2 and area of cross - section 2A ? |
|
Answer» SOLUTION :For FIRST wire : `R_1= RHO l/A = 4Omega` Now, for second wire : `R_2=rho (1/2)/(2A) = (1/4) rho 1/4` `R_2= 1/4 R_1( :. R_1 = rho 1/A)` `:. R_2 = 1/4 xx 4 ( :. R_1 = 4Omega`given) `:. R_2 = 1 Omega` The resistance of the another wire is `1 Omega`. |
|
| 4596. |
When we enter a dark room coming from outside, immediately the things inside the room do not appear clear to our eyes. This is because. |
|
Answer» pupils do not OPEN at all in the dark |
|
| 4597. |
Change in heat energy of the object when its temperature is changed: |
|
Answer» Solution :`Q=m XX c xx DELTA T` where, m= MASS of OBJECT , c= Specific HEAT of object, `Delta T` = change in temperature of object. |
|
| 4598. |
An electric current of 64mA flows through a bulb for 10minutes. How many electrons pass through the bulb during this time? (e = 1.6 xx 10^(-19) C) |
| Answer» SOLUTION :`N =2.4 XX 10^20` | |
| 4599. |
How does light normally travel ? |
|
Answer» In CONCENTRIC circles |
|
| 4600. |
In inelastic scattering, the energy of incident and scattering light are same. |
| Answer» Solution :CORRECT statement-In inelastic SCATTERING , the ENERGY of INCIDENT and SCATTERED light are not same. | |