If the order of the matrix is m×n, then how many elements will there be in the matrix?

- a)mn
- b)m
^{2}n^{2} - c)mn
^{2} - d)2mn

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

Infinity Academy answered • 1 hour ago

The number of elements for a matrix with the order m×n is equal to mn, where m is the number of rows and n is the number of columns in the matrix.

The points which shows the position of atoms in a crystal are called as _________.

- a)Crystal Lattice
- b)Crystal Parameters
- c)Bravais Lattice
- d)Lattice Point

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

Infinity Academy answered • 1 hour ago

The point at which the atoms may be present on the unit cell is termed as lattice point. It shows the position of atoms in crystal.

Rai Bhavesh asked • 37 minutes ago

A body is allowed to slide on a frictional less track from rest under-gravity. The track ends in a circular loop of diameter D. What should be the minimum height of the body in terms of D, so that it may successfully complete the loop?

- a)4D/5
- b)5D/4
- c)D
- d)2D

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

Anjali Sarda asked • 51 minutes ago

A house subtends a right angle on the window of its opposite house and the angle of elevation of the window from the foot of the former houses is 60^{o}. If the distance between houses is 6 metres, then the height of the former house is

- a)6√3m
- b)8√3m
- c)4√3m
- d)24m

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

Abhishek Choudhury asked • 54 minutes ago

If a circle passes through the point (a, b) and cuts the circle x^{2} + y^{2} = 4 orthogonally, then the locus of its centre is -

[AIEEE-2004]

- a)2ax + 2by + (a
^{2}+ b^{2}+ 4) = 0 - b)2ax + 2by – (a
^{2}+ b^{2}+ 4) = 0 - c)2ax – 2by + (a
^{2}+ b^{2}+ 4) = 0 - d)2ax – 2by – (a
^{2}+ b^{2}+ 4) = 0

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

Josh Mathew asked • 1 hour ago

Two particles A and B start moving due to their mutual interaction only. If at any timet, a_{A }and a_{B} are their respective accelerations, v_{A }and v_{B} are their respective velocities, and up to that time W_{A }and W_{B }are the work done on A and B respectively by the mutual force, m_{A }and m_{B} are their masses respectively, then which of the following is always correct?

- a)m
_{A}v_{A }+m_{B}v_{B}=0 - b)v
_{A}+v_{B}=0 - c)W
_{A}+W_{B}=0 - d)a
_{A}+a_{B}=0

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

Mansi Behl asked • 1 hour ago

The following statements relate to the adsorption of gases on a solid surface. Identify the **incorrect **statement among them:

- a)Enthalpy of adsorption is negative
- b)Entropy of adsorption is negative
- c)On adsorption, the residual forces on the surface are increased
- d)On adsorption decrease in surface energy appears as heat

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

Mansi Behl asked • 1 hour ago

A single slit of width b is illuminated by a coherent monochromatic light of wavelength λ. If the second and fourth minima in the diffraction pattern at a distance 1 m from the slit are at 3 cm and 6 cm respectively from the central maximum, what is the width of the central maximum? (i.e. distance between first minimum on either side of the central maximum)

- a)1.5 cm
- b)3.0 cm
- c)4.5 cm
- d)6.0 cm

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

O Kaif Sid asked • 1 hour ago

Let [x] denote the integral part of x ∈ R and g(x) = x – [x]. Let f(x) be any continuous function with f(0) = f(1) then the function h(x) = f(g(x))

- a)Has finitely many discontinuities
- b)Is continuous on R
- c)Is discontinuous at some x = c
- d)Is a constant function.

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

Mansi Behl asked • 2 hours ago

If the Earth has no rotational motion, the weight of a person on the equator is W. Determine the speed with which the earth would have to rotate about its axis so that the person at the equator will weigh 3/4 W. Radius of the Earth is 6400 km and g=10 m/s^{2}.

- a)1.1×10
^{−3}rad/s - b)0.83×10
^{−3}rad/s - c)0.63×10
^{−3}rad/s - d)0.28×10
^{−3}rad/s

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

Pratima Hatizar asked • 2 hours ago

A 60 kg weight is dragged on a horizontal surface by a rope to 2 metres. If coefficient of friction is μ=0.5, the angle of rope with the surface is 60^{o} and g=9.8 m/sec^{2}, then work done is

- a)294 joules
- b)315 joules
- c)588 joules
- d)197 joules

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

Utkarsh Sinha asked • 2 hours ago

A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500∘Cand then placed on large ice block. The maximum amount (in kg) of ice that can melt is (Specific heat of copper =0.39Jg^{-1}∘C^{-1}, latent heat of fusion of water=335Jg^{-1})

Correct answer is '1.46'. Can you explain this answer?

Mansi Behl asked • 2 hours ago

A compound **A** with molecular formula C_{10}H_{13}Cl gives a white precipitate on adding silver nitrate solution. **A** on reacting with alcoholic KOH gives compound **B **as the main product. **B** on ozonolysis gives **C** and **D**. **C** gives Cannizaro reaction but not aldol condensation. **D** gives aldol condensation but not Cannizaro reaction.** A** is :

- a)
- b)
- c)
- d)

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

Alokik Gupta asked • 2 hours ago

A mass M collides elastically with a stationary mass m. If M < m, then it is possible for M to bounce directly backwards. However, if M > m, then there is a maximum angle of deflection of M. Then angle is

- a)sin φ = M/m
- b)sin φ = m/M
- c)tan φ = M/m
- d)tan φ = m/M

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

Krishan Goyal asked • 3 hours ago

Sodium carbonate cannot be used in place of ammonium carbonate for the identification of the fifth group radicals . This is because the

- a)Sodium ions will interfere in the detection of the fifth group radicals
- b)Concentration of carbonate ions is very low
- c)Sodium will react with acidic radicals
- d)Magnisium will be precipitated

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

Vedha Varshini asked • 3 hours ago

Consider the following statements about sound passing through a gas

A. The pressure of the gas at a point oscillates in time

B. The position of a small layer of the gas oscilates in time

A. The pressure of the gas at a point oscillates in time

B. The position of a small layer of the gas oscilates in time

- a)Both A and B are correct
- b)A is correct but B is wrong
- c)B is correct but A is wrong
- d)Both A and B are wrong

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

Rishi Kant Arya asked • 4 hours 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) :A relation*R* on the set of complex number defined by Z_{1} RZ_{2} ⇔ Z_{1} − Z_{2} is real, is an equivalence relation.

Reason(R) :Reflexive and symmetric properties may not imply transitivity.

Assertion(A) :A relation

Reason(R) :Reflexive and symmetric properties may not imply transitivity.

- 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?

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