Mansi Behl asked • 7 minutes ago

Which one of the following solutions of sulphuric acid will exactly neutralise 25 ml of 0.2 M sodium hydroxide solution ?

- a)12.5 ml of 0.1 M solution
- b)25 ml of 0.1 M solution
- c)25 ml of 0.2 M solution
- d)50 ml of 0.2 M solution

Correct answer is option 'B'. Can you explain this answer?

Shubham Choudhary asked • 54 minutes ago

A bullet hits and gets embedded in a solid block resting on a frictionless surface. In this process which one of the following is correct ?

- a)only momentum is conserved
- b)only kinetic energy is conserved
- c)neither momentum nor kinetic energy is conserved
- d)both momentum and kinetic energy are conserved

Correct answer is option 'A'. Can you explain this answer?

Karan asked • 54 minutes ago

Can you explain the answer of this question below:

An electric kettle has two heating coils. When one of the coils is connected to an ac source the water in the kettle boils in 10 minutes. When the other coil is used the water boils in 40 minutes. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be

- A:
##### 4 min

- B:
##### 25 min

- C:
##### 15 min

- D:
##### 8 min

The answer is d.

Kumari Sakshi asked • 1 hour ago

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-

Assertion (A):

Reason (R): The non zero vectors are always linearly independent

Assertion (A):

Reason (R): The non zero vectors are always linearly independent

- a)Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- b)Both Assertion and Reason are true and Reason is not the correct explanation of Assertion.
- c)Assertion is true but Reason is false.
- d)Assertion is false but Reason is true.

Correct answer is option 'A'. Can you explain this answer?

Prajwal Yaligar asked • 1 hour ago

A beam of electromagnetic radiation of intensity 6.4 × 10^(–5) W/cm2 is comprised of wavelength,lambda= 310 nm. It falls normally on a metal (work function = 2eV) of surface area of 1 cm2. If one in10^3 photons ejects an electron, total number of electrons ejected in 1 s is 10^x . (hc = 1240 eVnm,1eV =

Correct answer is '11'. Can you explain this answer?

Ram Mohith asked • 2 hours ago

For r = 0, 1, ...., 10 let A_{r}, B_{r}, C_{r} denote, respectively, the coefficient of x^{r} in the expansions of (1 + x)^{10}, (1 + x)^{20} and (1 + x)^{30}. Then is equal to [JEE 2010]

- a)B
_{10}- C_{10} - b)
- c)0
- d)C
_{10}- B_{10}

Correct answer is option 'D'. Can you explain this answer?

Shan Singh asked • 2 hours ago

A point charge q is placed in space. Consider an arbitrary shaped Gaussian surface which is divided into two parts I and II by an imaginary plane as shown in figure. For this situation mark out the correct statement(s).

- a)Electric flux crossing through II is +ve and through I is -ve.
- b)Electric flux crossing through II is -ve and through I is +ve.
- c)Electric flux through I and II are equal and opposite.
- d)Both (b) and (c) are correct.

Correct answer is option 'D'. Can you explain this answer?

Shashi Singh asked • 3 hours ago

If p , x_{1} , x_{2} , … x_{i} … and q , y_{1} , y_{2} , … y_{i} … are in A.P., with common difference a and b respectively, then the centre of mean position of the points A_{i}(x_{i}, y_{i}) where i = 1, 2, ..., n lies on the line

- a)ax − by = aq − bp
- b)bx − ay = ap − bq
- c)bx − ay = bp − aq
- d)ax − by = bq − ap

Correct answer is option 'C'. Can you explain this answer?

Manpreet Kalra asked • 3 hours ago

- a)[ML
^{ 2}T -3 I^{-1}] - b)[ML
^{ 2}T^{-2}] - c)[ML
^{2}T^{ -1}I^{-1}] - d)[ML
^{ 2}T^{-3}I^{ -2}]

Correct answer is option 'D'. Can you explain this answer?

Danish Wajahath Wajahath asked • 3 hours ago

One end of a spring of negligible unstretched length and spring constant k is fixed at the origin (0,0). A point particle of mass m carrying a positive charge q is attached at its other end. The entire system is kept on a smooth horizontal surface. When a point dipole pointing towards the charge q is fixed at the origin, the spring gets stretched to a length l and attains a new equilibrium position (see figure below). If the point mass is now displaced slightly by Δl ≪ l from its equilibrium position and released, it is found to oscillate at frequency The value of δ is ______.-

Correct answer is '3.14'. Can you explain this answer?

Mansi Behl asked • 3 hours ago

Q. The fractional change in intensity of the central maximum as function of time is

- a)Asinwt/L
- b)2Asinwt/L
- c)3Asinwt/L
- d)4Asinwt/L

Correct answer is option 'B'. Can you explain this answer?

Amrish Kumar Pandey A asked • 4 hours ago

Select incorrect statements(s):

- a)Electron-withdrawing inductive effect of the carbonyl group in -COOH group weakens the O-H bond and favours ionisation of a carboxylic acid compared with an alcohol
- b)Inductive effect of the chlorine destabilises the acid and stabilises the conjugate base
- c)Aniline is a weaker base than ammonia
- d)Phenol is a weaker acid than water

Correct answer is option 'A'. Can you explain this answer?

Mishika Jaiswal asked • 4 hours ago

The parametric equations of a curve traced by a projectile on a certain planet with no surrounding are given by :y = (8t-5t^{2}) metre and x = 6t metre, where t is in seconds. The velocity with which the projectile is projected, is

- a)6 m−s⁻
^{1} - b)8 m−s⁻
^{1} - c)10 m−s⁻
^{1} - d)16 m−s⁻
^{1}

Correct answer is option 'C'. Can you explain this answer?

Kusum Kumari asked • 4 hours ago

For the reaction A→B, the rate law expression is rate = k[A]. Which of the following statements is incorrect?

- a)The reaction follows first order kinetics
- b)The t₁∕₂ of reaction depends on initial concentration of reactants
- c)k is constant for the reaction at a constant temperature
- d)The rate law provides a simple way of predicting the conc. of reactants and products at any time after the start of the reaction

Correct answer is option 'B'. Can you explain this answer?

Mansi Behl asked • 4 hours ago

The locus of the point of intersection of the straight lines,

tx−2y−3t=0

x−2ty+3=0 (t ∈ R), is :

tx−2y−3t=0

x−2ty+3=0 (t ∈ R), is :

- a)an ellipse with eccentricity 2/√5
- b)an ellipse with the length of major axis 6
- c)a hyperbola with eccentricity √5
- d)a hyperbola with the length of conjugate axis 3

Correct answer is option 'B'. Can you explain this answer?

Jai Prakash asked • 5 hours ago

- a)The radius r +/r - increases as coordination number increases
- b)As the difference in size of ions increases coordination number increases
- c)When coordination number is eight, the r +/r - ratio lies between 0.225 to 0.414
- d)In ionic solid of the type AX(ZnS, Wurtzite) the coordination number of Zn 2+ and S 2- respectively are 4 a

Correct answer is option 'C'. Can you explain this answer?

Danish Wajahath Wajahath asked • 5 hours ago

Choose the correct statement(s) among the following :

- a)[FeCl
_{4}]^{–}has tetrahedral geometry. - b)[Co(en)(NH
_{3})_{2}Cl_{2}]^{+}has 2 geometrical isomers. - c)[FeCl
_{4}]^{–}has higher spin-only magnetic moment than [Co(en)(NH_{3})_{2}Cl_{2}]^{+}. - d)The cobalt ion in [Co(en)(NH
_{3})_{2}Cl_{2}]^{+}has sp^{3}d^{2}hybridization.

Correct answer is option 'A,C'. Can you explain this answer?

Parul Agrahari asked • 5 hours ago

Consider the following statements:

Assertion (A) : The internal energy of an ideal gas does not change during an isothermal process

Reason (R) : The decrease in volume of a gas is compensated by a corresponding increase in pressure when its temperature is held constant

Of these statements :

Assertion (A) : The internal energy of an ideal gas does not change during an isothermal process

Reason (R) : The decrease in volume of a gas is compensated by a corresponding increase in pressure when its temperature is held constant

Of these statements :

- a)Both A and R are true and R is the correct explanation of A
- b)Both A and R are true and R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true

Correct answer is option 'B'. Can you explain this answer?

Sumana Basu asked • 6 hours ago

If the electric flux entering and leaving an enclosed surface respectively is φ_{1} and φ_{2} , the electric charge inside the surface will be

- a)φ
_{2}- φ_{1}/ε_{0} - b)φ
_{1}+ φ_{2}/ε_{0} - c)φ
_{1}- φ_{2}/ε_{0} - d)(φ
_{1}+ φ_{2})ε_{0}

Correct answer is option 'D'. Can you explain this answer?

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