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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.
| 901. |
How long did fossil fuel formed |
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Answer» Answer: it TAKES MILLIONS and millions of years to FORM fossil fuels .. there is no exact time given... mark me as the BRAINLIEST |
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| 903. |
Answer please don't send wrong answers please |
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Answer» Explanation: 9.1*10^-31 X 9.8/1.6*10^-19 =5.57*10^-11v/m |
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| 904. |
Answer please don't send wrong answer please |
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Answer» OPTION a is ABSOLUTELY RIGHT |
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| 905. |
Name a fuel which is stored in tanks and often used for heating houses |
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Answer» carosien Explanation: PLZ MARK me as BRAINLIEST |
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| 906. |
Answer please don't send wrong answers please |
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Answer» D .................. |
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| 907. |
3. What is the name of the non-metal whichexists liquid state at room temperature? |
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Answer» 'Bromine' is the non-metal which exists in the LIQUID STATE at ROOM TTEMPERATURE. |
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| 908. |
Electromagnetic waves arecalled |
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Answer» X RAYS are the ELECTROMAGNETIC WAVES |
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| 909. |
Prepare a seminar paper on cyclones.(What is a cyclone? Factors which are responsible for cyclone? Safetymeasures that reduce the loss of life and property) |
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Answer» Explanation: FOLLOW meeeeeeeee |
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| 910. |
State Kepler's law of motion along with the figure |
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Answer» Kepler's three laws of planetary MOTION can be stated as follows: (1) All planets move about the Sun in elliptical orbits, having the Sun as ONE of the foci. (2) A radius VECTOR JOINING any planet to the Sun sweeps out equal areas in equal lengths of time. |
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| 911. |
a stone thrown vertically upwards travels to a height 6M and Falls back to the hand on the basis of the above |
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| 912. |
Name a fuel which can be used in an oven for cooking |
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Answer» Fuels LIKE LPG (Liquefied Petroleum Gas) burns quickly and easily without LEAVING any residue behind. It's great for COOKING. For more traditional OVENS, coal can also be used for cooking. |
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| 914. |
Please give answer . please help. |
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Answer» As the depth of liquid increases the weight of liquid column pushing down from above increases and HENCE the pressure also increases. make three hole in a bottle serial VISE from top to middle then BOTTOM you'll observe that the top most hole is releasing water with less force and bottom hole is releasing water with GREATER force. the same thing as above, if the pressure increases with depth that MEANS the liquid applies more pressure on bottom make three holes on a bottle on a line around the bottle you'll observe that the force of liquid is equal on all the holes same as the above |
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| 915. |
Two rods A and B of the same weight 10 kg and equal length 5m have different cross section area 20 cmand 60 cm- respectively. They are beld vertically on the surface of sand. The ratio of pressure applied by Ato pressure applied by B on the sand is: |
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Answer» Explanation: |
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| 916. |
Calculate the intensity level of mosquito buzz |
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Answer» A typical SOUND level for a buzzing mosquito is 40 dB, and that of a vacuum cleaner is approximately 70 dB. Approximately how MANY buzzing MOSQUITOES will produce a sound intensity equal to that of a vacuum cleaner? The number of buzzing mosquitoes will produce a sound intensity. |
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| 918. |
Find the average speed from this distance time graph |
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Answer» Answer: 8 by 9 Explanation: |
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| 919. |
Give the answer got it .please help . |
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Answer» Answer: take this and enjoy your LIFE |
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| 920. |
D. Answer the following questions in brief:1. An object experiences a net non-zero force. Is it possible for the object to travel witha constant speed in a straight line?2. "Snow shoes are more effective for walking on snow than ordinary shoes. Why?3. When we throw a ball upwards, what happens to its speed while it is going up? Givereason for your answer.4. Give two examples, from daily life, where a force may change the shape of an object.5. Distinguish between contact and non-contact forces giving examples.6. Explain why porters' place a round piece of cloth on their heads when they carry heavyloads,the friction insnow the |
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Answer» Answer: 1..Answer to your question is , therefore, it will certainly move with constant speed. Whenever there is a non-zero net force, it will CONSTANTLY changing the speed or velocity of the object. ... 2. Snow shoes with spikes are more effective for walking on snow than ordinary shoes because they create more friction as COMPARED to ordinary one which is necessary for walking on a slippery surface as snow. 3. When we throw a ball upwards, its speed retards gradually. This is because the earth produces a gravitational force which brings down everything that goes up. So when a ball is thrown upward the gravity applies force to bring it down which decreases its speed of going up... 4..a)When you bounce a ball, the wall of the ball is temporarily compressed b)When you squeeze a lump of clay.. 5. A non-contact force is a force which acts on an object WITHOUT coming physically in contact with it. The most familiar example of a non-contact force is gravity, which confers weight. In contrast a contact force is a force applied to a body by another body that is in contact with it. 6. The round piece of cloth on their heads increases the area on which the force (weight of the load) will act. We know that, the pressure is inversely proportional to area. Therefore, increase in area reduces the pressure and this helps the porter to carry the HEAVY load easily.... if you GOT your answer then mark me as BRAINLIEAST and dont forget to FOLLOW ME... |
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| 921. |
Compare the atmospheric pressure of two places 500m and 2 km respectively above sea-level. Give reason for your answer. |
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Answer» The atmospheric pressure is the weight exerted by the overhead atmosphere on a unit area of surface. It can be measured with a mercury barometer, consisting of a long glass tube full of mercury inverted over a pool of mercury:
Figure 2-1 Mercury barometer
When the tube is inverted over the pool, mercury flows out of the tube, creating a vacuum in the head space, and stabilizes at an equilibrium height h over the surface of the pool. This equilibrium requires that the pressure exerted on the mercury at two points on the horizontal surface of the pool, A (inside the tube) and B (outside the tube), be equal. The pressure PA at point A is that of the mercury column overhead, while the pressure PB at point B is that of the atmosphere overhead. We obtain PA from measurement of h:
(2.1)
where RHG = 13.6 g cm-3 is the density of mercury and g = 9.8 m s-2 is the acceleration of gravity. The mean value of h measured at sea level is 76.0 cm, and the corresponding atmospheric pressure is 1.013x105 kg m-1 s-2 in SI units. The SI pressure unit is called the Pascal (Pa); 1 Pa = 1 kg m-1 s-2. Customary pressure units are the atmosphere (atm) (1 atm = 1.013x105 Pa), the bar (b) (1 b = 1x105 Pa), the millibar (mb) (1 mb = 100 Pa), and the torr (1 torr = 1 mm Hg = 134 Pa). The use of millibars is slowly giving way to the equivalent SI unit of hectoPascals (hPa). The mean atmospheric pressure at sea level is given equivalently as P = 1.013x105 Pa = 1013 hPa = 1013 mb = 1 atm = 760 torr.
2.2 MASS OF THE ATMOSPHERE
The global mean pressure at the surface of the Earth is PS = 984 hPa, slightly less than the mean sea-level pressure because of the elevation of land. We deduce the total mass of the atmosphere ma:
(2.2)
where R = 6400 km is the radius of the Earth. The total number of moles of air in the atmosphere is Na = ma/Ma = 1.8x1020 moles.
Exercise 2-1. Atmospheric CO2 concentrations have increased from 280 ppmv in preindustrial times to 365 ppmv today. What is the corresponding increase in the mass of atmospheric carbon? Assume CO2 to be well mixed in the atmosphere.
Answer. We need to relate the mixing ratio of CO2 to the corresponding mass of carbon in the atmosphere. We use the definition of the mixing ratio from equation (1.3) ,
where NC and Na are the total number of moles of carbon (as CO2) and air in the atmosphere, and mC and ma are the corresponding total atmospheric masses. The second equality reflects the assumption that the CO2 mixing ratio is uniform throughout the atmosphere, and the THIRD equality reflects the relationship N = m/M. The change DmC in the mass of carbon in the atmosphere since preindustrial times can then be related to the change DCCO2 in the mixing ratio of CO2. Again, always use SI units when doing numerical calculations (this is your last reminder!):
Explanation: ️ |
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| 922. |
Evaporation of water is a |
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Answer» Answer: physical process Hope this answer will satisfy you....... plz MARK BRAINLIEST |
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| 923. |
A piece of paper undergoes a chemical change, when it i |
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Answer» Answer: A PIECE of paper undergoes a chemical change, when it is BURNED. In chemical change, REACTANTS combine to FORM a new PRODUCT which differs in properties from reactants. Heat energy will be absorbed or released. It is permanent and irreversible |
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| 924. |
In the diagram below the area of the small piston is 2m2 and the large piston is 120 m2 a. If the small piston is pushed down with a force of 20N, calculate the pressure exerted on the liquid. b. If the same pressure is transmitted by the liquid to act on the large piston, calculate the force acting on the large piston. ""Compare the force acting on the large piston with that being exerted on the smaller piston."" Please answer this question ^^^^^^^ |
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Answer» |
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| 925. |
Two forces A and B are acting on an object in the opposite direction to produce a net force of 452N. The magnitude of force A is 340 N and the object moves in the direction of force A. Calculate the magnitude of force B .with calculations |
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Answer» EXPLANATION:F NET =Fb-Fa 452=Fb-340 Fb=792 |
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| 926. |
What is the 10 example of balance force and inblance force |
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Answer» Answer: HI THE ANSWERS ARE THERE IN THE EXPLANATION :) Explanation: example of balance force 1) you are pushing a wall and as expected, the wall does not move and NEITHER do you. It means that you and the wall are exerting a balanced force on each other. 2) a game of tug-of-war between two equally matched teams. Neither of the teams is able to pull the opposing team towards itself. This is an example of two balanced forces. 3)HANGING objects. The forces on this hanging CRATE are equal in size but act in opposite directions. 4)Floating in water. Objects float in water when their weight is balanced by the upthrust from the water. 5)Standing on the ground example of unbalance force 1) If you kick a football and it moves from one PLACE to another, it means that unbalanced forces are acting upon it 2) two people on a seesaw. The person on the right is SIGNIFICANTLY heavier than the person on the left and the seesaw is effectively tilted towards him. 3)If you and your friend push on a door with the same force in opposite directions, the door does not move. Because you both exert forces of the same size in opposite directions of the door, the two forces cancel each other. 4) Free falling body until you reach terminal velocity PLS MRK AS BRAINLIEST PLSSSSS CAN U :) |
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| 927. |
A particle's position on the x axis is given by x = 4 - 27t+ ,with x in meters and t in seconds.(a) Find the particle's velocity function v(t) and accelerationfunction a(t). |
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Answer» Youqwer Explanation: |
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| 928. |
What must be done to enable mercury in a glass thermometer to respond quickly to changes in temperature? *The bulb should contain a lot of mercuryThe wall of glass bulb should be thin.The bore should be narrowThe wall of stem should be thin. |
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| 929. |
Charge 2c acts as a point charge to create and electric field is strong 3N/Cthen find the electric force |
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Answer» Answer: Explanation: We know that, Electric force = Charge × Electric field ie, GIVEN that, Charge = q = 2C Electric field = E = 3 N/C Putting these VALUES in F = qE we get, F = 2×3 F = 6N |
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| 930. |
two identical bodies of charges 1 into 10 power minus 9 or separated by a distance 1 metre find the force between them |
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Answer» Answer: Explanation 9 *10 to power -9 is the answer F=kq²/r² K=9*10 to the power 9 so PUTTING the VALUES of Q and r we get F=9*10 to the power -9 |
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| 931. |
the total charge of a system containing five charges + 1 + 2 - 3 + 4 + 5 is same arbitrary........... unit |
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Answer» Given : A system contains five charges +1 , +2 , -3 , +4 and +5 . To Find : The net charge on the system system contains five charges +1 +2 , -3 , +4 and +5 . net charge on the system will be summation of all charges + 1 + 2 - 3 + 4 +5 +12 - 3 = +9 The net charge on the system is +9 unit Learn More: a system contains nine charges 1uc 2uc 3uc.. 9uc the total charge ... If a charge of 420 C flows through a conducting wire in 5 minutes ... The ELECTRIC field due to a point charge at a distance 1 m from it is 90 ... three point charges q1(=-1 microCoulomb), q2(=+2 micro Coulomb ... |
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| 932. |
Can u solve this 3 questions |
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Answer» Explanation: lOL this Is The Answer Of Your Question |
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| 933. |
charge Q act as a point charge to create an electric field it is sent measured a charge of 2c is 4N/C what is the magnetic force strength |
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Answer» ksgehdnskskdurncuebhdusv5461014hsj |
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| 935. |
Framethe meanposition03 pret Seallina Plith rudence to ano Characterstics of sound determined by itMazimum deplacementI Time taken to competete one oscillationfrequencycob Characteristic of sound determined by itsamplitude. |
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| 936. |
2. A person drives 3 km West. The person then turns around and travels 1 km East. Finally, the person travels 2 km East. The total trip takes 2 hours. a) Sketch the motion of the person. Clearly label positions (number and units) and directions throughout the bear’s trip. Also, label displacement vectors with magnitudes during the person’s trip. b) What total distance does the person travel? c) What is the person’s total displacement? (Include magnitude and direction.) d) What is the person’s average speed? e) What is the person’s average velocity? (Include magnitude and direction.) |
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Answer» Answer: Distance Travelled = 3+1+2 = 6KM DISPLACEMENT = 3 - 1 - 2 = 0 Average SPEED = 6km / 2hrs = 3 km/hr. Average velocity = 0/2 = 0 (ans). Explanation: KINDLY SELECT MY ANSWER AS THE BRAINLIEST ANSWER. |
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| 937. |
A rubber sucking cup sticks to a smooth surface because |
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Answer» because their is no air at all in a rubber sucking and it is LIKE a VACUUM |
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| 938. |
Fill in the blanks: a. _ is an example of not matter. b. The state of matter which can be easily compressed is _. c. Gasses do not have any _ surface. |
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Answer» Answer: hope this helps Explanation: B. gas |
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| 939. |
How can you feel one newton force?19. What is meant by force of gravity?20. Give reason.a. School bags are provided with wide straps to carry them.b. The walls of a dam are thicker near the bottom than at the top21. Define pressure. Give its S.I. Unit.22. Give any two applications of pressure in our daily life.23. What is frictional force? Give one example.24. What are the two parameters that define pressure?25. Explain why astronauts wear specially designed spacesuits?26. What is atmospheric pressure?27. Why do mountaineers suffer nose bleeding at high altitudes?28. What are non-contact forces?29. What is electrostatic force? |
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Answer» Answer: Explanation: one newton is equal to 1 meter per second ^2 ACCELERATION brought to a 1 kg weighing body. force of gravity is the force which attracts everything to earth it was discovered by sir Issac Newton and the force of gravity on earth is 9.8 the formula of pressure is force / area so if we increase the area under contact then the force will decrease so that's why we have wide straps in bags the walls of dam are THICK near bottom to withstand the high pressure by water pressure is defined as force per unit area. S.I unit of pressure is pascal which is denoted by P cutting a fruit with a knife, doctor injecting a syringe frictional force is the force applied by the surface in contact of a body which tries to oppose the motion of the moving body, example is a BALL rolling on floor stops after some time mass and volume are the two parameters which define pressure astronauts wear spacesuits as to maintain the pressure exerted on their body atmospheric pressure is the pressure exerted by atmosphere on earth humans most sensitive blood vessels are of nose so when there is very less pressure like in mountains the blood starts flowing forces which are not in physical contact with the body attraction of any object due to charge for example try rubbing your ruler on your head and then it'll attract light objects like pencil shavings |
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| 940. |
Convert -80°celcius into Kelvin temprature. |
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Answer»
-80+273.16=193.16 ............. |
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| 941. |
What is the atomic mass unit. |
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Answer» Answer: a unit of mass USED to express atomic and molecular WEIGHTS, equal to one twelfth of the mass of an atom of carbon-12. Explanation: The dalton or unified atomic mass unit is a unit of mass widely used in PHYSICS and CHEMISTRY. It is defined as 1/12 of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest. The atomic mass constant, denoted mᵤ, is defined identically, giving mᵤ = m/12 = 1 Da. |
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| 942. |
A car of mass 2500 kg moving with a velocity 10 m / sec brought to rest in 5 sec by applying brakes.Find the retarding force produced by the brakes. |
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Answer» Answer:- Given:-
To Find:- Regarding force (F) produced by the brakes. _____________... FINDING acceleration:- We know, a = (v-u)/t or, a = -u/t where,
So, a = - (10 m/s)/5s ➵ a = (-10 m/s)/5s ➵ a = -2 m/s² ...(Acceleration) Finding RETARDATION force:- We know, F = ma where,
∴ F = (2500 kg) (-2 m/s²) ➵ F = - 5000 kg m s^-2 ➵ F = - 5000 N ...(Force against MOTION) Therefore, the retarding force was (-5000 N) against the path of motion. |
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| 943. |
State true or false:1. Molecules of solid are tightly packed.( )2. In liquids , interchange of positions of molecules is not possible.( ) |
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Answer» Answer: 1.true 2.false Explanation: MARK me as BRAINLIEST PLZ... |
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| 944. |
Convrt the following units into SI units without changing their values.a) 3500gb) 2.5kmc) 2hif u find these 3 ans I'll mark as you brilliant |
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Answer» Answer: 3500g = 3.5kg 2.5km = 2500m 2h = 7200 s |
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| 945. |
Smartest animals in the world is............... |
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Answer» The SMALLEST ANIMAL in the WORLD is KITTI's hog-nosed BAT . |
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| 946. |
Fig. shows a weather balloon. Theballoon is shown partly filled with gasfrom a cylinder. Fig. The ballooncontains no gas initially. When it isconnected to the cylinder, gas entersthe balloon. The pressure in thecylinder decreases.Explain why the molecules inside the cylinderi. exert a large pressure initially,ii. exert a smaller pressure in the cylinder when the balloon is filled. |
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Answer» the action or PROCESS of PRECIPITATING a substance from a SOLUTION. |
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| 947. |
1. A polar bear walk 2 miles North, then 4 mi East, then 4 mi West, then 3 mi South. The bear completes his trip in 4 hours. a) Sketch the motion of the bear. Clearly label positions (number and units) and directions throughout the bear’s trip. Also, label displacement vectors with magnitudes during the bear’s trip. b) What is the bear’s total distance traveled? c) What is the bear’s total displacement? (Include magnitude and direction.) d) Draw the displacement vector for the entire trip below. Label magnitude and show direction. e) What is the bear’s average speed during the trip? f) What is the bear’s average velocity during the trip? (Include magnitude and direction.) |
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Answer» Explanation: |
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| 948. |
Derive Relation Between time and graph? |
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Answer» Answer: Let the initial velocity of the object = u Let the object is moving with uniform acceleration, a. Let object reaches at point B after time, t and its final velocity BECOMES, v Draw a line parallel to x-axis DA from point, D from where object starts moving. Draw another line BA from point B parallel to y-axis which meets at E at y-axis. The distance COVERED by the object moving with uniform acceleration is given by the area of trapezium ABDO |
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| 949. |
Imagine that the distance from school toyourfriend's house in 2250 m. state this in kilometre |
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Answer» Answer: 2.25 KM Explanation: 1 km= 1000 m therefore , 2250 m =2250/1000 km = 2.25 km |
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| 950. |
Elements elements are broadly classified into metals and non-metals. State 6 general differences in physical properties of metals and non-metals. State two methods & 2 non- metals which contradict with the general physical properties - giving reasons. State one difference in property between metals and noble gases.plz answer don't send unnecessary answers. if someone sends l will follow him if correct answer comes |
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Answer» Answer: The answer is Explanation: Non METAL properties: may be solid, liquid or GAS at room temperature. has lower melting point than METALS. has lower boiling point than metals. non-lustrous - dull, not shiny. poor conductors of heat. poor conductors of electricity. brittle - break when stretched. low tensile strength - EASILY broken. Metal Physical Properties: Lustrous (shiny) Good conductors of heat and electricity. High melting point. High density (heavy for their size) Malleable (can be hammered) DUCTILE (can be drawn into wires) Usually solid at room temperature (an exception is mercury) Opaque as a thin sheet (can't see through metals) |
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