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Monocotshave only oneseedleaf inside theseedcoat. It is often only a thin leaf, because the endosperm to feed the new plant is not inside theseedleaf. Dicots have twoseedleaves inside theseedcoat. They are usually rounded and fat, because they contain the endosperm to feed the embryo plant.

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Fossils are dead remains of animals and plants from remote past.Fossils are formed when dead organisms are not completely decomposed. The organisms may get trapped in resins of tree, lava of volcanoes or hot mud, which when hardens retains the animal’s parts thus forming fossils.Two methods of determining the age of fossils are:

1.Relative method:By estimating the age of the layer of earth’s crust where the fossil is found. Fossils near the surface are recent and those in the deeper layers are more ancient.

2.Radio-carbon dating method:By detecting the ratios of different isotopes of carbon in the fossils.

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option c momentum of each is a right answer

all of these (d) is the right answer

d all of these. j

all of these (d) is the rihht answer

d all of these is right

D is correct answer

When abodyis free to rotate around an axis, torque must be applied to change its angular momentum. ... For an extendedrigid body, themoment of inertiais just the sum of all the small pieces of mass multiplied by the square of their distances from the axis in question.

Let u=5.0 v=8.0 t=4.0hence,a=v-u\ta=8-5÷4a=0.7m/s

Distance covered in one round is = 2*π*(56) = 2*22/7*56 = 352m time = 3 min = 3*60 = 180 sec

so, D/t = speed = 352/180 = 1.95 m/s

c. 5

Anything that burn with flame contain volatile substance. These volatile substances vaporise and they burn with a flame.Every substance does not contain volatile compound so does not burn with flame.For eg. - Iron burns without producing a flame. It just glows red.

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Given side of metal cube, a = 8 cmVolume of cube = a3cubic units= 83= 512 cu cmWe know that water will go up in the cylindrical tube which is equal to the volume of the cube.Hence volume cylindrical tube = 512 cu cmThat is, πr2h = 512(22/7) x 10 x 10 x h = 512On simplification, we get h = 1.63 cm (nearly)

Take an empty tin can . Pour some hot water in it Be sure that the can is air tight Put the can under cold running tap water .We will observe a change in its shape This proves atmosphere also exerts pressure Hope that helped

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yes 2 is the right answer

2 is the right answer

work done by resistive force is F.d , should be equal to change in K.E

and Kinetic energy lost is = mg(h+d)

=> F.d = mg(h+d)=> F = mg(h+d)/d=> F = mg(1+h/d)

option D

Hello Shefali please give the answer don't send the blank answer

U= 20 m/sv= 0s = 5 cm = 0.05 m

from 3rd equation,v² -u² = 2as⇒0 - (20)² = 2×0.05×a⇒0.1 a = - 400⇒a = - 4000 m/s²

deceleration will be - 4000 m/s²

the rising and setting of the Sun, the Moon, and stars were some of the methods used earlier to measure time.

A steady state in thermodynamics is nothing but a state of system which does not changes with time.

Now state of a any system as stated by state postulate, is specified by two independent intesive properties. So we can say that if during any process the properties of any system does not change with time or are constant at any point in system during the whole process then the state of the system is said to be steady.

Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. There are two types of electric charges; positive and negative. Electric charge is carried by subatomic particles.

The basic properties of electric charges are as follows:

Charges are additive in nature

Charge is a conserved quantity

Quantization of charge

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Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. There are two types of electric charges; positive and negative. Like charges repel and unlike attract. An object with an absence of net charge is referred to as neutral.

The wordoscillatoryrefers to something that moves back and forth repeatedly. The wordperiodicrefers to something that repeats after a regular amount of time.

While oscillatory motion will almost certainly be periodic, not all periodic motion will be oscillatory.

A common example is the orbit of the earth around the sun. A complete orbit takes roughly 365 days and therefore this is a periodic motion. However, cannot be said to be oscillatory.

Newton's third lawis: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object

The SI derived unit of electric charge is thecoulomb(C). In electrical engineering, it is also common to use theampere-hour(Ah), and, in chemistry, it is common to use the elementary charge (e as a unit). The symbol Q often denotes charge.

The SI derivedunit of electric chargeis the coulomb (C). Inelectricalengineering, it is also common to use the ampere-hour (Ah), and, in chemistry, it is common to use the elementarycharge(e as aunit). The symbol Q often denotescharge

coulomb (c)

SI UNIT OF ELECTRIC CHARGE IS COULOMB(C).

coulomb (c) this is a answer

The unit of charge is coulomb

The unit of electrical charge is couloumb

1. The chargeisascalar quantity as it has only magnitude andnodirection.2. The chargeis just as other fundamentalpropertiesofthesystem like mass.Theonly difference between mass andchargeisthat chargeis bothpositive and negative, while mass is always positive.3. Total charge in an isolated system is always conserved. When there are many bodies in an isolated system, the charges get transferred from one body to another but the net charge of the system remains same.

SI unit of charge is Coloumb

Rutherford's modelshows that anatomis mostly empty space, with electrons orbiting a fixed, positively charged nucleus in set, predictable paths. Thismodelof anatomwas developed by ErnestRutherford, a New Zealand native working at the University of Manchester in England in the early 1900s.

Limitations of Bohr Model1)electron couldn’t circle around nucleus like a planet! …Because they would lose energy (by emitting electromagnetic radiation) & spiral into nucleus.2)Bohr was not able to explain electron orbits of large atom w/ many electronsLimitations of BohrAtomic Model Theory

It violates theHeisenberg Uncertainty Principle. The Bohr atomic model theory considers electrons to have both a known radius and orbit i.e. known position and momentum at the same time, which is impossible according to Heisenberg.

The Bohr atomic model theory made correct predictions for smaller sized atoms like hydrogen, butpoor spectral predictions are obtained when larger atoms are considered.

It failed to explain the Zeeman effect when the spectral line is split into several components in the presence of a magnetic field.

It failed to explain the Stark effect when the spectral line gets split up into fine lines in the presence of an electric field.

Postulates ofRutherford nuclear model:

Positive charge is concentrated in the center of the atom, called nucleus.

Electrons revolve around the nucleus in circular paths called orbits.

The nucleus is much smaller in size than the atom.

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