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# School

What is a Wheatstone bridge

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S safeer

It is an arrangement of four resistances which can be used to measure one of them in terms of rest. Let R is an adjustable resistance, Pand Q are known resistance and S is an unknown resistance. To obtain value of S we will close the keys K1 and K2 and will adjust R to obtain null deflection in the galvanometer. Then the balancing condition of the bridge is

# School

For a perfectly rigid body, Young's modulus is ........

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S safeer

For a perfectly rigid body deformation is not there, so the strain is zero. Hence youngs modulus (Y=stress /strain) is infinite.

# School

The equivalent inductance between A and B is

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S safeer

All the three Inductance are in parallel L = 3/3 =1 H

# School

What is the resistance between A andâ€‹ B

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S safeer

The 2 ohm resistance at vertex are in series, so the net value is 4 ohm. The 4-ohm resistances are parallel Now all 2 ohms are in series So the net resistance = 6 ohm

# School

Red and blue balls were in a bag 5/12 were red. What is the ratio of red and blue balls

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S safeer

Given out of 12, five are red, therefore 12-5=7 are blue. The ratio of red and blue balls is red/blue = 5/7

# School

Define transverse wave with example .

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A Avinash Dongre

Transverse waves - In these types of waves, the particles of the medium vibrate in a direction perpendicular to the direction of propagation of the wave. e.g.wave produced in a long string when one end is fixed.

# School

6+( 5 - 4 + 2 ) is

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S safeer

6+( 5 - 4 + 2 ) =6+(1+2)=6+3=9

# School

Find the ratio between 100 ml and 2l

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S safeer

To find the ratio first we have to convert to the same units 2l = 2 x 1000 ml = 2000 ml So the ratio is 100/2000 = 1/20

# School

Sin20â° tana sec70â°â‰ˆâˆš3. find A

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S safeer

sin 20 = cos 70 since sin x = cos (90-x) Also sec 70=1/cos70 using above results

# School

Find the area of a rectangle of length 20cm and breadth 40 cm

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S safeer

length=20cm breadth = 40cm area of rectangle= length x breadth=20 x 40 = 800 cm2

# School

what is 582,030 in word from.

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S safeer

five lakh eighty-two thousand and thirty

# School

Why they multiply with pls

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S Shubham Krishnan

we have multiplied with 1.6 x 10-19 because it is the value of e and 106 is the value of megavolt to volt.

# School

A solid ball of radius R has a charge density $\rho$ given by $\rho$ = $\rho _{0}$ $(1-r/R)$ for 0 ≤ r ≤ R. The electric field outside the ball is :

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S safeer

Total charge on sphere:

# School

In the given circuit for what value of X the net resistance between A and B is 50 ohm

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S safeer

# School

The effective resistance between the terminals X and Y is. The resistance is in ohms

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S safeer

Three 5 ohm resistance are in series, which is parallel to 10 ohm The equivalent resistance is R= (15 x 10) / 25 = 6 Ohm

# School

List four functions of the human heart. Why is double circulation necessary in the human body?

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S Sumit

Functions of the human heart- (1) Receives deoxygenated blood from different parts of the body (2) Sends or pump blood to lungs for oxygenation (3) Receives oxygenated blood from the lungs. (4) Pumps or transfer oxygenated blood to different parts of the body. Double circulation is necessary because it does not allow the mixing of oxygenated and deoxygenated blood. This separation...

# School

Due to heavy floods in a state, thousands were rendered homeless, 50 schools collectively offered to the state governments to provide the place and the canvas for 1500 tents to be fixed by the government and decided to share the whole expenditure equally The lower part of each tent is cylindrical of base radius 2.8m and height 3.5, with the conical upper part of the same base radius but of height 2.1m. If the canvas used to make the tents cost 120 per sq.m, find the amount shared by each school to set up the tents. what value is generated by the above problem?

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R Ravindra Pindel

No. of tents = 1500 radius = 2.8 m height of cylindrical part = H = 3.5 m height of conical part = h = 2.1 m now , slant height of conical part = l = surface area of tent = CSA of conical part + CSA of cylindrical part The surface area of tent = 92.4m2 The surface area of 1500 tents = 1500 * 92.4m2 = 138600 m2 Cost of 1m2 canvas = Rs 120 costs of 138600 m2 canvas = 120 * 138600 costa...

# School

Find all the zeroes of $2x^4 - 13x^3 + 19x^2 + 7x - 3$ , if you know that two of its zeroes are $2+\sqrt{3}$ and $2-\sqrt{3}$ .

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R Ravindra Pindel

Given that Two zeroes are and . The factor of the given polynomial : Now divide the polynomial with their factor Now factor the above equation : The zeroes are , and .

# School

In the circuit shown, find C if the effective capacitance of the whole circuit is to be 0.5 $\mu F$ . All values in the circuit are in $\mu F$ .

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S safeer

7+3C =14C 11C =7

# School

_{A man donates 10 aluminum buckets to an orphanage. A bucket made of aluminum is of height 20 cm and has its upper}

_{and lowest ends of radius 36 cm and 21 cm respectively. Find the cost of preparing 10 buckets if the cost of aluminum sheet is}

_{42 per 100 cm2. Write your comments on the act of the man.}

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S safeer

Bucket in the shape of frustum Height = h = 20 cm Radius = R = 36 cm radius = r = 21 cm Area covered with aluminum sheet for 10 buckets = CSA of a frustum of cone + area of the bottom therefore the TSA of 10 buckets are = cost of aluminum sheet for is The total cost of the aluminium sheet is rupees 24621

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