Explore topic-wise InterviewSolutions in .

For pure water and perfectly clean glass, the angle of contact is0°

while walking because while we are standing we feel our body is light but,while we are walking we can't walk with 2 legs at a time because the stability will be less this while we are keeping 1 leg on surface we exert more pressure

while walking because while we are standing we feel our body is light but,while we are walking we can't walk with 2 legs at a time because the stability will be less this while we are keeping 1 leg on surface we exert more pressure

while standing because the man both leg Soo force is more on floor

Most objects in space are so far away, that using a relatively small unit ofdistance, such as an astronomical unit, is not practical. Instead, astronomersmeasure distancesto objects which are outside our solar system inlight-years.

work done will be counted if there is a displacement in the direction of applied Forceso in that case for example Work is done when lifting the suitcase up, but you’re not doing workon the suitcaseif you merely move forward and then stop such that the initial and final velocities of the suitcase are the same.

90 is the correct option

Frictional force = 0.2×49 =9.8, acting in downward direction.

ER. RAVI KUMAR ROY

Also , weight of block i.e 10×9.8= 98N acts downward& block is moving with constant velocity.Therefore, net force is zero.So, required vertical force = 98+9.8 = 107.8

The instrument used to observe stars and other heavenly bodies is:Telescope

the instruments used to celestial bodies is telescope

Arain gauge(also known as anudometer,pluviometer, or anombrometer) is an instrument used by meteorologists and hydrologists to gather and measure the amount of liquid precipitation over a set period of time.

rain gauge is a device used to measure the amount of rainfall

If bodies are at same temperature, means at thermal equilibrium, there is still transfer of heat between them and surroundings. But the rate of exchange or transfer of heat between them is different for each body. So, if we touch a metal object, the heat transfer rate is much more than that of wooden object. As soon as we touch the metal object, its thermal equilibrium is disturbed (assuming our body temperature to be higher). It will try to maintain its previous state of equilibrium by rapid transfer of heat from our body to itself, making us feel cold. Since this transfer rate is much higher in metals than wood, the metal feels cold instantaneously while wood do not.

Similarly, if metal piece is hot (our body temperature is lower), then heat transfers from metal to us. This makes us feel metal to be very hot in comparison to a wood piece at same temperature.

Thermostat is a device used for automatically maintaining a steady temperature.

The wooden chair

Let origonal volume be V and original pressure= 1 atm

New volume =0.01%V = 0.0001V

New pressure=100 atm

Bulk moulus, K =-V. ∆P/∆V [ pressure is increased while volume is decreased]

K= -V. (100–1)/(V-0.0001V)

K= —99/0.9999

K= —99.009901 atm

TheUniverseis all ofspaceandtimeand their contents,includingplanets,stars,galaxies, and all other forms ofmatterandenergy. While the spatial size of the entire Universe is unknown,it is possible to measure theobservable universe.This is ordinarymattercomposed ofprotons,neutrons, andelectrons. It comprises gas,dust, stars, planets, people, etc. This is the so-called "missing mass" of the universe. It comprises thedark matterhalos that surroundgalaxiesand galaxy clusters, and aids in the formation of structure in the universe.

One electron possesses a charge of 1.6 ×10^-19C, i.e., 1.6 ×10^-19C of charge is contained in 1 electron.

∴ 1 C of charge is contained in 1/1.6 x 10^-19= 6.25 x 10^18= 6 x 10^18

Therefore,6 x 10^18electrons constitute one coulomb of charge.

hydrogen nd carbon dioxide

It's because the current source of energy which we are using(fossil fuels) will at our current rate of consumption will exhaust in 50 to 100 years.In order to protect these fuels and protect our future we are looking for alternative sources of energy.

Like my answer if you find it useful!

We are looking at alternate source of energy beacuse sources which we are using now are non-renewable and take millions of year to be formed and can cause global warming like energy obtained by burning coal, petroleum etc but energy sources like solar energy,tidal energy etc are environmental friendly and all renewable sources of energy and are present abundant in nature

Like my answer if you find it useful!

For isothermal expansion, Theirinternal energychanges with changeinpressure, even if temperature is constant.Foran idealgas,inanisothermal process, Δ U = 0 = Q − W , so . Theinternal energyis a state function dependent on temperature. Hence, theinternal energychange is zero.

kerosene it is use as fraction of petroleum in jet fuel

B)keroseneused as jet aeroplanes.

comparing this equation with

y = asin(-wt+kx) ...... w = 6 k= 2π/wavelength = 160.

amplitude is a = 4×10-³ = 4/1000 = 0.004 m

wavelength is = 2π/k = 2π/160 = π/80 m time period is 2π/w = 2π/6 = π/3 s frequency is w/2π = 6/2π = 3/π s-¹

After 2sS = t^2/4S = 1m

v = dS/dtv = 2t/4v = t/2

a = dv/dta = 1/2 m/s^2

F = maF = 6*1/2F = 3N

W = F * SW = 3 * 1W = 3J

option (4) is correct.

Water based paints are used in paints surfacing of the roads

SDRAM stands for Synchronous dynamic random access memory.

A switchis an electric device that is used to complete or break an electric circuit. If the switch is ‘ON’, then a current can flow through the circuit. However, if the switch is ‘OFF’, then the current cannot flow through the circuit.Electrical appliances such as table fans, electric lamps, washing machines, juicers and mixers, TV, radio, etc. have switches built into them.

Switch, a globally recognized leader in future-proof datacenter design, superscale cloud, unparalleled telecom gateways and energy sustainability, opens – The Citadel Campus. Designed for up to 7.2 million square feet of data center space and up to 650 megawatts (MW) of power…

(i). 5m/s(ii). 18km/h

1.Hydrometer2.753.Mollusca4.Mustard5.CaCO3

[L¹M¹T-²] is the dimensional formula for force

As lemon pickle is an acid and aluminum is a metal and metals react with acids to produce hydrogen gas, it is not advisable to store lemon pickle in an aluminum utensil because it will spoil the pickle and holes will be formed in the vessel.

metals reacts with acids vigorously to form metallic chlorides,which acts as a poison for human body thatswhy lemon being citric acid cant be stored in aluminium utensils

what are causes of lightening

a size, amount, etc. that is found by measuring is called measurment

since beta is on power with t so beta*(t) should be dimensionless therefore dimension of beta is 1/dim(t) = 1/sec = 1/T and since V•/beta should have dimension of L. so dimension of V = L*(1/sec) L/T

Coulombforce, also called electrostaticforceor Coulomb interaction, attraction or repulsion of particles or objects because of their electric charge. ... The electricforceis operative between charges down to distances of at least 10-16metre, or approximately one-tenth of the diameter of atomic nuclei.

Pressure due to a liquid column of height h:p= h ρ g

Where,

h = Height of columnρ = Density of fluidg = Acceleration due to gravity

By substituting the values as h = 200m g = 9.8 m/s2and ρ = 1000Kg/m3

The third law of thermodynamics states that the entropy of a system at absolute zero is a well-defined constant. This is because a system at zero temperature exists in its ground state, so that its entropy is determined only by the degeneracy of the ground state.

1

Rate of leakage = 4×10-6×10 = 4×10^-5m3/s

Consider a molecule moving in the x-direction towards face A with velocity u1. On collision with face A the molecule will experience a change of momentum equal to 2mu1. (Figure 3)It will then travel back across the box, collide with the opposite face and hit face A again after a time t, where t = 2L/u1.

The number of impacts per second on face A will therefore be 1/t = u1/2L.

Therefore rate of change of momentum = [mu12]/L = force on face A due to one molecule.

But the area of face A = L2, so pressure on face A = [mu12]/L3

But there are N molecules in the box and if they were all travelling along the x-direction then

Total pressure on face A = [m/L3](u12+ u22+...+ uN2)

But on average only one-third of the molecules will be travelling along the x-direction.

Therefore:pressure = 1/3 [m/L3](u12+ u22+...+ uN2)

Japan

Japan

V=w/k

Thus,v=12.5×10^-7

Dielectricconstant k=c/v

Where c is speed of light

Thus ans is 2.4 option a

U = - 18 cm

v = 4 cm

1 / f = 1 / v + 1 / u

1 / f = 1 / 4 + 1 / (- 18)

1 / f = 1 / 4 - 1 / 1 8

1 / f = 9 - 2 / 36 = 7 / 36

f = 36 / 7 cm

focal length is positive so mirror is convex.

R = 2 × 36 / 7

= 72 / 7 cm