QAD - Nepali Educate - Educational Resources for Class 11 & 12 Students

QAD

A student is trying to make an accurate measurement of the wavelength of green light from a mercury lamp alpha = 546 nm). Using a double slit of separation of 0.50 mm, he finds he can see ten clear fringes on a screen at a distance of 0.80 m from the slits. He then tries an alternative experiment using a diffraction grating that has 3000 lines/cm.

A student is trying to make an accurate measurement of the wavelength of green light from a mercury lamp alpha = 546 nm). Using a double slit of sepa…

(a) State Bernoulli’s Principle. (b) Figure below shows a liquid of density 1200kgm-3 flowing steadily in a tube of varying cross-sections. The cross- section at point A is 1.0 cm² and that at B is 20 mm², points A and B are in the same horizontal plane. The speed of the liquid at A is 10 cm/s. Calculate (i) the speed at B. (ii) the difference in pressure at A and B.

Question: (a) State Bernoulli’s Principle. (b) Figure below shows a liquid of density 1200kgm -3 flowing steadily in a tube of varying cross-sec…

The Concept of anti-derivative is necessary for solving differential equations. Justify the statement with examples.

Question collected form Telegram Group .

a) Explain what is meant by quantization of charge. (b) In a Millikan's oil drop experiment, an oil drop of weight 1.5 × 10^-14 N is held stationary between plates 10mm apart by applying a p.d. of 470V between the plates. (i) State the condition necessary for the drop to remain stationary. Also, sketch the forces acting on the oil drop. (ii) Calculate the charge on the oil-drop. (iii) Explain what would happen if the above oil drop is suddenly struck by a stray alpha particle.

Question: a) Explain what is meant by quantization of charge. (b) In a Millikan's oil drop experiment, an oil drop of weight 1.5 × 10 -14 N …

$Can Solution of 1M ZnSO4 be stored in a vessel made up of Nickel? Given: $E_{N{i^{ + 2}}/Ni}^0 = - 0.25V$ $E_{Z{n^{ + 2}}/Zn}^0 = - 0.76$$

Can Solution of 1M ZnSO4 be stored in a vessel made up of Nickel? Given: $E_{N{i^{ + 2}}/Ni}^0 = - 0.25V$ $E_{Z{n^{ + 2}}/Zn}^0 = - 0.76$

Question Collected from Telegram .

Discuss the meaning of standard oxidation potential of Cu/Cu+2 is -0.34.

Discuss the meaning of standard oxidation potential of Cu/Cu +2 is -0.34. Solution: The standard oxidation potential of Cu/Cu +2 (-0.34) represe…

The vibrations of a mass of 150 g are simple harmonic. Figure shows the variation with displacement x of the kinetic energy Ek of the mass.

The vibrations of a mass of 150 g are simple harmonic. Figure shows the variation with displacement x of the kinetic energy E k of the ma…

How much AgBr could dissolve in 1.0 L of 0.4 M NH3? Assume that [Ag(NH3)2]+ is the only complex formed given, Kf [Ag(NH3)2 +]= 1 × 108 , Ksp(AgBr)= 5.0 × 10-13

Question Collected from Telegram Group .

$Integrate $\frac{1}{{\left( {{\rm{x}} + 2} \right){{\left( {{\rm{x}} + 3} \right)}^2}}}$$

Integrate $\frac{1}{{\left( {{\rm{x}} + 2} \right){{\left( {{\rm{x}} + 3} \right)}^2}}}$

Question Collected From our Telegram Group .

$Integrate $\frac{{{{\rm{x}}^2}}}{{{{\rm{x}}^4} - 2{{\rm{x}}^2} - 15}}$$

Integrate $\frac{{{{\rm{x}}^2}}}{{{{\rm{x}}^4} - 2{{\rm{x}}^2} - 15}}$

Question Collected From our Telegram Group .

In the given energy level diagram, find a. The largest possible energy emission in given condition. b. The longest wavelength of emitted photon. c. From which atom, the energy levels have been taken.

Question Collected from Telegram Group .

Explain Class A Class B Class C IP address.

Question Collected from Telegram Group .

In a partially destroyed laboratory record of an analysis of regression data, the following data are legible: Variance of X = 9 Regression equations: 8x − 10y + 66 = 0 and 40x − 18y = 214. Find based on above information The mean values of X and Y. Correlation coefficient between X and Y. Standard deviation of Y.

Question Collected from Telegram Group .

If from a point P (a, b, c) perpendiculars PA and PB are drawn to yz and zx-planes, then find the vector equation of the plane OAB.

Solution: Point P is (a, b, c) PA ⊥ y z-plane and PB ⊥ z x-plane. ∴ A is (0, b, c) and B is (a, 0, c) We are to find the equation of plane thro…

What happens when hcl gas is passed through a saturated solution of NaCl and why?

Question Collected from Telegram Group .

The Solubility product constant (Ksp) of Ca (OH)2 at 25°C is 4.42x10-5. A 500 ml of Saturated Solution of Ca(OH)2 is mixed with an equal Volume of 0.4m NaOH. What mass of Ca (OH)2, is Precipitated out?

Question Collected from Telegram Group .

Obtain expressions for the instantaneous kinetic energy potential energy & total energy of a simple harmonic oscillator.

Question collected from Telegram Group

Does Lenz law follow the principle of conservation of energy? Explain

Question Collected from Telegram Group .

A circular metal disc of area $3×10^-3 m^2$ is rotated at 50 rev/s about an axis through its center perpendicular to its plane. The disc is in a uniform magnetic field of flux density $5×10 ^-3T$ in the direction of the axle. What is the value of induced EMF?

Question Collected from Telegram Group .

If beams of electrons and protons having the same kinetic energy normally enter an electric field, which beam will be more deviated?

Solution: Question Collected from Telegram Group .