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.
| 851. |
(Mass to Volume Calculation) Calculate the volume of CO_(2) at 25^(@)C, 1 atm that plants need to make 1.0 g of glucose, C_(6)H_(12)O_(6), by photosynthesis in the reaction 6CO_(2)(g)+6H_(2)O(l) to C_(6)H_(12)O_(6)(s)+6O_(2)(g) |
| Answer» SOLUTION :0.82 L | |
| 852. |
The boiling point of liquid depneds on |
|
Answer» its nature. |
|
| 853. |
A body is moving vertically upwards. Its velocity changes at a constant rate from 50 "m s"^(-1) to 20 "m s"^(-1) in 3 s. What is its acceleration ? |
| Answer» Solution :10 m `s^(-2)` The negative SIGN shows that the velocity DECREASES with TIME, so RETARDATION is 10 m `s^(-2)`. | |
| 855. |
What are the factors that determine the strength of the magnet? |
|
Answer» Solution :The strength of the magnetic FIELD at a point due to current CARRYING wiredepends on: (i) the current in the wire (II) distance of the point from the wire (III) the ORIENTATION of the point from the wier and (iv) the magnetic nature of the medium. |
|
| 856. |
Sound in air propagates in form of: |
|
Answer» LONGITUDINAL WAVE |
|
| 857. |
The speed time graph for a car is shown in fig 8.12 Which part of the graph represents uniform motion of the car? |
Answer» Solution :The part of the graph in RED color between TIME 6s to 10s represents uniform MOTION of the CAR. 
|
|
| 859. |
A space craft flying in a straight course with a velocity of 75 km s^(-1) fires its rocket motors for 6.0 s. At the end of this time, its speed is 120 km s^(-1)in the same direction. Find : (i) the space craft's average acceleration while the motors were firing, (ii) the distance travelled by the space craft in the first 10 s after the rocket motors were started, the motors having been in action for only 6-0 s. |
| Answer» SOLUTION :(i) 7.5 KM `s^(-2)` (II) 1065 km | |
| 860. |
The mass ofa certain amount of salt determined bytwo differentpersonswas foundto differ by 200mg.One usingtheleftpan forthe weight s and the otherusingthe rightpan. Which ofthefollowingstatement is false? |
|
Answer» There ISA zeroerrorin thebalance `g_(1):g_(2)=3:2` `(T_(1))/(T_(2)) =(sqrt(l_(1)//l_(1)))/(sqrt(l_(2)//l_(2))) = sqrt((4)/(9))` `(T_(1))/(T_(2)) =sqrt((4)/(9))=(2)/(3) : (f_(1))/(f_(2)) =3:2` |
|
| 861. |
We can create enlarged, virtual images with ......... .............. . |
|
Answer» CONCAVE mirror |
|
| 862. |
Determine the thickness of a single sheet of your science textbook with the help of a Screw gauge . |
|
Answer» Solution :Pitch scale reading = 0 . 0 5 m mL. C = 0 . 1 m m Head scale coincidence = 02 The thickness of a SINGLE sheet of SCIENCE text book= PSR + HSC + L . C + ZE = 0 . 5 m m + (02` XX` 0.1) = 0.05 mm + 0.2 mm = 0.07 mm |
|
| 863. |
When a golf ball is lowered into a measuring cylinder containing water, the water level rises by 30 cm^3 when the ball is completely submerged. If the mass of ball in air is 33 g find its density |
|
Answer» |
|
| 864. |
When a body starts from rest, the acceleration of the body after 2 second in ___ of its displacement . |
|
Answer» HALF |
|
| 865. |
Find the worng one among the following statements. |
|
Answer» By maintaining HIGHER pressure, the boiling point of water is raised to around `120^(@)C`, inside the cooker. |
|
| 866. |
Consider the following sound waves marked A,B, C and D: (a) Which two waves represent sounds of the same loudness but different pitch? (b) Which two waves represent sounds of the same frequency but different loudness? (c) State whether all these sound waves have been produced by the same vibrating body or different vibrating bodies? (d) Which vibrating body/bodies could have generated the sound waves shown here? |
|
Answer» |
|
| 867. |
Cathode ray particles have a mass of __________times that of hydrogen nucleus. |
| Answer» | |
| 869. |
If a heavenly object like an asteroid or a planetoid revolving around the sun moves into an orbit of smaller radius, its speed increases. |
|
Answer» |
|
| 870. |
At what pressure, are cathode rays produced ? |
| Answer» | |
| 871. |
Which of the following statements is false of a place closer to the north pole ? |
|
Answer» VgtH |
|
| 872. |
Complete the following sentence : Elephants produce ............. sound. |
| Answer» SOLUTION :INFRASONIC | |
| 873. |
What is inertia of rest ? |
|
Answer» |
|
| 874. |
Assertion(A) : When water is heated up to 100^@C, there is no rise in temperature until all water gets converted into water vapour. Reason : Boiling point of water is 10^@C |
|
Answer» If both assertion and reason are TRUE and reason is the correct explanation of assertion. |
|
| 875. |
A vehicle is accelerating on a straight road. Its velocity at any instant is 30 km h^(-1) after 2 s, it is 33.6 km h^(-1) and after further 2 s, it is 37.2 km h^(-1). Find the acceleration of vehicle in m s^(-1)? Is the acceleration uniform ? |
|
Answer» |
|
| 876. |
A sample of air containing certain amount of water vapour is saturated at a particular temperatures. If the temperature of the sample is raised further, then |
|
Answer» the SAMPLE BECOMES supersaturate |
|
| 877. |
A weightless rubber balloon has 100 g of water in it. Its weight in water in water will be : |
|
Answer» 100 g |
|
| 878. |
What are the various energy transfor-mations that occur when you are riding a bicycle? |
| Answer» Solution :While riding bicycle, the muscular energy of the rider gets TRANSFERRED into HEAT energy and kinetic energy of the bicycle. Heat energy heats the rider.s body. Kinetic energy, provides a VELOCITY of the bicycle. The TRANSFORMATION can be shaown as : Muscular energy - kinetic energy + Heat energy. During the transfor mation, the total energy REMAINS conserved. | |
| 879. |
Two bodies are at a speCific distance so as to attracteach other. Now many times will the mutual force ofattraction be if the mass of one of them is doubled? |
|
Answer» |
|
| 880. |
IEA is the short form of : |
|
Answer» INDIAN ENERGY Association |
|
| 881. |
The effort measured in S.I. system in liftinga load through a simple machine is numericallyequal to its mechanicaladvantage. If the mechanicaladvantage of the machine is increased by 20%, the same effort can lift a load of 12 kgwt. Find the magnitudes of the effort and the original load. (Take g=10 ms^(-2)) |
|
Answer» Solution :(i) Definition of MECHANICAL advantage. (ii) Relate mechanicaladvantage and effort in THETWO cases. (iii) Convert the load GIVEN into S.I. units and use the definition of mechanicaladvantage. (iv) Effort= 10 N , Load = 100 N |
|
| 882. |
An electric motor converts………………. |
|
Answer» |
|
| 883. |
A ball moves on a smooth floor in a straight line with a uniform velocity 10 m s^(-1) for 6 s. At t = 6 s, the ball hits a wall and comes back along the same line to the starting point with same speed. Draw the velocity-time graph and use it to find the total distance travelled by the ball and its displacement. |
| Answer» SOLUTION :DISTANCE = 120 m DISPLACEMENT. =0 | |
| 884. |
What are the units of density in (i) C.G.S and (ii) S.I. system? |
|
Answer» |
|
| 886. |
What do you understand about negative acceleration? |
| Answer» Solution :If v < u , i.e.if final VELOCITY is less than initial velocity, the velocity decreases with TIME and the VALUE of acceleration is NEGATIVE. It is called negative acceleration. It is also called as retardation (or) deceleration. | |
| 887. |
A hydraulic lift has been constructed to lift vehicles of maximum 3000 Kg. Weight. The area of cross section of the piston's platform on which the vehicles are lifted is 580 Sq.cm. Calculate the maximum pressure experienced on the small piston. |
|
Answer» |
|
| 888. |
Raman was waiting at a tyre puncture repair shop to get his bicycle tube repaired. There is a large pond of water a little distance away from this shop. Some children were playing near the pond. Raman saw a five year old child fall into the pond accidently while playing. The child was drowning in pond water and screaming for help. Raman took a big, inflated car rubber tube' which was lying in the shop and immediately threw it towards the drowning child in the pond. He shounted asking the child to cling to the inflated tube and hold on to it strongly till the help arrived. Raman then made a telephone call to Fire Brigade from his mobile phone. The Fire Brigade reached within ten minutes and the firemen brought the drowning child out of the pond safely. Everybody praised the efforts the efforts of Raman and firemen. (a) What happens when an inflated car tube is thrown in water of the pond? Why? (b) Why did Raman throw an inflated car rubber tube towards the drowning child and ask him to hold onto it? (c) Which principle is made use of by Raman in saving the drowning child? State this principle. (d) What values are displayed by Raman in this episode? |
|
Answer» Solution :(a) When an inflated car rubber tube is put in water, if floats in water. This can be explained as follows: The inflated rubber tube contains a lot of compressed air in it. Now, air is a very, very light substance. So, due to the presence of lot of air in it, the average density of inflated car tube is much less than the density of water. Since the average density of inflated car tube is less than that of water, therefore, the inflated car tube floats in water. (b) Raman threw an inflated car rubber tube towards the drowning child and asked him to hold on to this inflated tube because the inflated rubber tube would remain floating in water and, alongwith it, the child would also remain floating in water and not get drowned. Actually, when the child clings to the inflated rubber tube, then (due to his weight) more portion of inflated rubber tube gets submerged in water, it displaces more water and hence the upward buoyant force increases. This greater upward buoyant force keeps the inflated rubber tube and the child HOLDING it, both afloat on the surface of POND water (and prevents drownings). (c) Raman made use of the principle of flotation. According to the principle of flotation: An object will float in a liquid if the weight of object is equal to the weight of liquid displaced by it. (d) The VARIOUS values displaced by Raman are (i) Knowledge of principle of flotation (ii) APPLICATION of knowledge in everyday situations (ii) Presence of mind (in throwing an inflated tube immediately towards the drowning child) (iv) Responsible citizen (in calling FIRE Brigade to rescue the following child), and (v) Helping nature (in saving drowning child). |
|
| 889. |
A glass ball hanging from the hook of a sensitive spring balance is completely submerged in highly salty water and tap water, one. If the readings of spring balance when the ball is in highly salty water and tap water are x and y respectively, then: |
|
Answer» `X LT y` |
|
| 890. |
A constant volume air thermometer is as shown in the figure below. Explain why the bottle is partly filled with mercury. Find the ratio fo volume of mercury present in the bottle to the volume of the bottle if the volume coefficients of mercury and glass are 1.8xx10^(-4)K^(-1) and 6xx10^(-5)K^(-1), respectively. |
|
Answer» Solution :(i) Given the TWO metal cylinders are of the same material. Their specific heat capacity and ensity are the same. In the equation `Q=msDelta thea,` express MASS in TERMS of volume and density. Volume of a cylinder `=pir^(2)l`, where 'R' and 'l' are its radius and length, respectively. Given heat supplied to both the cylinders is equal, `RARR Q_(A)=Q_(B)`. Ratio of the lengths and ratio of the radii of the cylinders is given. Hence, from the above equation, find the ratio of the rise in temperatures of the cylinders. 2:1 |
|
| 891. |
Explain why the ozone layer is not affected by the solar wind. |
| Answer» Solution :Magnetic field can penetrate through all KINDS of materials. The EARTH PRODUCERS its own magnetic field. Which shields the earth.s ozone layer from the SOLAR WIND. | |
| 893. |
Complete the following sentence : If the field lines in a magnetic field are parallel and equidistant, the magnetic field is……………. . |
| Answer» SOLUTION :UNIFORM | |
| 894. |
Which is the solution in the followings solutions? (i) Hydrogen chloride and water, (ii) 80 mL of nitrogen and 20 mL hydrogen. |
| Answer» SOLUTION :(i) HYDROGEN CHLORIDE, (II) hydrogen. | |
| 895. |
A sound producing body is at considerable distance from a man. There can be four different medium W,X,Y and Z between the sound producing body and the man. The medium X brings the sound to man most quickly whereas medium Z takes the maximum time. The time taken by medium W in bringing sound to man is less than that of X but more than that of Z. The medium Y, however, fails to bring the sound from the sound producing body to the man. Which medium could be the one: (a) having no fixed shape and no fixed volume? (b) having a fixed volume but no fixed shape? (c) having the same composition as that on the moon? (d) having a fixed shape and a fixed volume? |
|
Answer» |
|
| 896. |
A stone is thrown vertically up from the tower of height 25m with a speed of 20 m/s What time does it take to reach the ground ? (g=10 m//s^(2)) |
|
Answer» Solution :SIGN convention must be used to SOLVE this problem. It is shown in figure. We consider the upward direction as positive and downward direction as negative with respect to a point of REFERENCE. In the above example the point of projection is considered as the point of reference. Then, u=20 m/s `a=g=-10 m//s^(2)` `s=h=-25 m` From equation of motion `s=ut + 1//2 at^(2)` `-25 =20 t-1//2 X 10 x t^(2)` `-25=20t -5 t^(2)` `-5=4t -t^(2)` `rArr t^(2)-4t-5=0` Solving this equation, We get, (t-5) (t+1)=0 t=5 or -1 t=5s |
|
| 897. |
What is the unit of work in the SI system of unit? |
| Answer» | |
| 898. |
List the applications of sound. |
|
Answer» Solution :Applications of ultrasound • Ultra sound can be used in cleaning technology. Minute foreign particles can be removed from objects placed in a liquid BATH through which ultrasound is passed. • Ultrasounds can ALSO be used to DETECT cracks and flaws in metal blocks. • Ultrasonic waves are made to REFLECT from various parts of the heart and FORM the image of the heart. This technique is called .echo cardiography.. • Ultrasound may be employed to break small .stones. formed in the kidney into fine grains. These grains later get flushed out with urine. |
|
| 899. |
A rubber balloon filled with hydrogen gas is left free in air. Then the balloon |
|
Answer» escapes into space. |
|
| 900. |
________rays are used in the treatment of cancer. |
| Answer» | |