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3)that was right answer

option C should be correct

because when the rheostat is at right.. then resistance offered by it , will be more.. and gradually it will decrease.. so potential around other resistance will increase..hence V1 reading will also increase.

1 joule is the best answer.

After completing half revolution, particle speed remains constant so change in speed will be 0 m/sec, but there is change in velocity vector... Both have same magnitude but opposite directions, so magnitude of change in velocity will be 20 m/sec

Given, m = 800 kgr = 40 mμ = 0.5

Maximum velocity with which car can move without falling is vmax = √(μrg)vmax = √(0.5 × 40 × 9.8)vmax = 14 m/s

Therefore, maximum velocity with which car can move without falling is 14 m/s.

(b) is correct option

option b is correct answer

The force exerts a deceleration on the body and it can be found by,F=ma50=20×aa=2.5ms^-2

The deceleration is2.5ms^-2

To find the time taken to stop the mass, we can use, v = u+at0=15-2.5tt=15/2.5t=6s

Therefore, it would take 6 seconds to stop the mass

velocity is 54km/h = 54*5/18 = 15m/sand distance covered is 15m also final velocity is 0.

so, u² = 2*a*s => a = u²/2s = 15*15/2*15 = 15/2 m/s² now force will me M*a = 800*15/2 = 400*15 = 6000N

Resistance is given by the cotangent of the angle made by curve with v axis

R= cot42° option (d) is correct.

i think the answer is 475j. please inform me whether i am right or not

we know that Force = qVB(sin 90= 1))so after putting all the value= 1.6*2*2*10⁻¹⁸N5.12*10⁻¹⁸NAnswer

Thanks

as its placed perpendicular hence theta is 90 torque is NIABcosthetaand if costheta is zerohence torque is zero

option D.

hai

alphabets like A,H,I,M,O,T,U,V,W,X,Y donot show lateral inversion

option B is the correct answer

b is the right answer

b is the right answer

option b is the correct answer of the given question

Here option d is correct

The distance of far point x = 1.5mTo view distant objects, concave lens of focal length -1.5 should be used.i.e. f = -x = -1.5mPower of lens = 1/f = 1/(-1.5m) = -0.666D

To correct this defect of vision, he must use a concave lens. The concave lens will bring the image back to the retina

2R because due to wires neglected remaining resistance

Here, u = - infinity, v = - 2m (or -200cm)

1/f = 1/v - 1/u

1/f = -1/2 + 1/infinity

therefore, f=-2m

P = 1/f = -1/2 = - 0.5 D

hence power of lens req is - 0.5 D

beyond 2 m is the right answer

Intial velocity(u) = 39.2 m/sfinal velocity(v) = 0

acceleration(a) = -9.8

a) using third equation of motion

2as = v^2 -u^22 (-9.8)(s)= (0)^2 - (39.2)^2 -19.6 s = - 1536.6419.6s = 1536.64s = 1536.64 / 19.6= 78.4

so,the maximum height covered = 78.4 m

b) let time taken be t

using acceleration formula

a= (v-u)/t-9.8 = (0- 39.2)/t-9.8 t = -39.29.8t = 39.2t = 39.2 / 9.8= 4

Thanks

To explain the phenomenon of ferromagnetism, Weiss proposed a hypothetical concept of ferromagnetic domains. He postulated that the neighboring atoms of the ferromagnetic materials, due to certain mutual exchange interactions, from several number of very small regions, called domains.Weiss theory of ferromagnetism is also called domain theory of ferromagnetism. It has following points:

The domains which are aligned approximately along the direction of the applied magnetic field grow in size at the cost of unfavorably oriented domains, that is, those align opposite to the field direction get reduced. In other words, the domain boundaries move so as to expand the favorable domains.

Also domains rotate and orient themselves in the direction of the external magnetic field.

In the presence of the weak external field, the magnetisation in the material occur mostly by the process of domain growing, but in the strong magnetic field the material is magnetised mostly by the process of domain alignment. When the field is removed, the domain boundaries do not recover their original positions and thus the material is not completely demagnetised, but some residual magnetism remains in it.

b)time period(denoted by 'T' ) is thetimeneeded for one complete cycle of vibration to pass in a given point. As the frequency of a wave increases, thetime periodof the wave decreasesSI unit is second

c)Frequency is the number of occurrences of a repeating event per unit of time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency.SI unit - HZ

a) Amplitude is the maximum displacement of points on a wave, which you can think of as the degree or intensity of change. This maximum displacement is measured from the equilibriumSI unit is meter

option bthere is intermolecular hydrogen bonding in methanol and no hydrogen bonding in methyl thiol

Ans :- Ursa Minor constellation lies in the northern sky. The constellation’s name means “the smaller bear,” or “the lesser bear,” in Latin.

The Great Bear constellation is represented by its larger neighborUrsa Major. Ursa Minor was first catalogued by the Greek astronomer Ptolemy in the 2nd century. It is easy to recognize because it contains the famousLittle Dipperasterism. Ursa Minor is also notable for marking the location of the north celestial pole, as it is home toPolaris, the North Star, which is located at the end of the dipper’s handle.

Following precautions should be taken to avoid the overloading of domestic circuits: (a) Do not use too many appliances at the same time. (b) Use the appliances within the safe limit of electric circuit. (c) Do not connect too many appliances in a single socket.

कर्नो इंजन की प्रमेय लिखो।

the two different current ratings provided in a domestic circuit are 5A and 15A. this is because different electrical appliances have different power ratings. hence, they draw different current when connected to the mains supply. some appliances need smaller currents, while some other need heavy currents.

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when the bob is a height l then it potential energy = m g lIt hits another block of same mass.So as per conservation of energym g l will be equally distributed among the two.Hence kinetic energy of block will be1/2 * m g l

If total Mass = M is pulled up using a uniform rope of mass m and length L and work done is W=Mgl+mgl/2= (M+m/2) gl. The ans will be 2(M+m-2)

A. Distance between earth and stars- light yearB. Inter atomic distance- micronC)size of nucleus- AngstromD) Wavelength- fermi

3) is correct answer

Hook’s Law: Stress = Young’s Modulus × strain

⇒F/A=Yδ/L⇒δ=FLAY

dδ=dFxAY

dF= centrifugal force due to mass of the element of length dx

=dMxω2=MLxdxω2

dδ=MLdxω2x.xAY

δ=∫L0Mω2LAYx2dx=Mω2L23AY

3) is the right answer of the following

2) is the correct answer

4) is the correct answer

Ans :- Combustion from Industry

Almost all of the common air pollutants can be produced by industrial processes. Some of these are produced by combustion of fossil fuels that drive the industrial process, resulting in particulates, ozone and nitrogen oxides.

Transportation Emissions

Common forms of transportation like cars, planes and ships generally use combustion to harness energy from fossil fuels. The combustion process releases pollutants into the air, such as particles and carbon monoxide, and also releases substances that quickly form into nitrogen oxides and ozone, which are important air pollutants.

Home Heating

Keeping homes warm is commonly the job of fossil fuels such as oil, gas and coal. Their combustion means that heating is an important source of air pollutants like sulfur dioxide. If electricity is used to heat the house, the energy plants that produced it may also have been driven by fossil fuels.

Home Cooking

The energy used in cooking may have come from energy plants, in which case the potential for air pollution has arisen earlier. Alternatively, such as in developing countries, home cooking requires direct burning of wood or coals, which produces the particulate pollution at the point of use.

Agriculture Side-Effects

Farmers use machinery driven by fossil fuels to plow fields and harvest produce, and the animals that are raised in bulk for food also produce their own type of air pollution. Methane is a gas that contributes to the greenhouse effect that allows global warming; it arises from intestinal gas released by livestock.

Air pollution occurs when harmful or excessive quantities of substances ...... A very effective means to reduce air pollution is the transition to renewable energy. may cause diseases, allergies and even death to humans; it may also cause harm to other living organisms such as animals and food crops, and may damage thenaturalorbuilt environment. Both human activity and natural processes can generate air pollution.

When light travels from adenser mediumto ararer medium, it bends away from the normal, as illustrated to the left. This behavior follows fromSnell's Law. As you saw before, the larger angle must be in themediumhaving the lower index ofrefraction

If light travels from one medium with refractive index ni and incident angle i, to another medium with refractive index nr and refraction angle r, then the relationship is described by Snell's Law as such:nisin(i)=nrsin(r)

which can be rewritten like this:sin(i)/sin(r)=nr/ni

The case where light travels from a denser to rarer medium, then the only change would be that now ni>nr in which case the above equation would yield the index of refraction of the rarer medium in relation to the denser medium.

(a) sini > sinr is correct option

As theangle of incidenceincreases, theangle of refractiongets closer to ninety degrees. At anyangle of incidencegreater than the criticalangle, the light cannot pass through the surface - itisall reflected

When a liquid is cooled, the molecules become denser until it become solid.

Sound waves are characterised by the motion of particles in the medium and are called mechanical waves. Air is the most common medium through which sound travels. When a vibrating object moves forward, it pushes and compresses the air in front of it creating a region of high pressure. This region is called a compression (C).

Hence, option c is correct.

thanks

Deforestation is the permanent destruction of forests in order to make the land available for other usesCauses:Agricultural Expansion,Livestock Ranching, Logging, Infrastructure Expansion. ,Overpopulation.Effect :The most dramatic impact is a loss of habitat for millions of species. Eighty percent of Earth's land animals and plants live in forests, and many cannot survive the deforestation that destroys their homes. Deforestation also drives climate change

Sound, a mechanical disturbance from a state of equilibrium that propagates through an elastic material medium. The study of sound should begin with the properties of sound waves. There are two basic types of wave, transverse and longitudinal, differentiated by the way in which the wave is propagated.

Sound waves are mechanical waves. Unlike EM waves, mechanical waves can't travel in vacuum, because for their propagation they require oscillation of matter. So they can transfer only through a medium.

Presbyopia is a common defect of vision, which generally occurs at old age. A person suffering from this type of defect of vision cannot see nearby objects clearly and distinctively. A presbyopic eye has its near point greater than 25 cm and it gradually increases as the eye becomes older.

Presbyopia is caused by the

1. Weakening of the ciliary muscles

2. Reduction in the flexibility of the eye lens.