At low pressure, the van der Waal’s equation is reduced to
At low pressure, the van der Waal’s equation is reduced to Solution Van der Waals equation is an equation relating... View Article
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A simple pendulum is oscillating without damping. When the displacement of the bob is less than maximum, its acceleration vector a is correctly shown in
To find the acceleration of the pendulum, firstly calculate the time taken for one oscillation (T) by the pendulum by... View Article
Heptane and octane form an ideal solution. At 373 K, the vapour pressures of the two liquid components are 105.2 kPa and 46.8 kPa respectively. What will be the vapour pressure of a mixture of 26.0 g of heptane and 35 g of octane?
Vapour pressure of heptanes, \(\begin{array}{l} p^{\circ}_{1}p1∘ \end{array} \)= 105.2 kPa Vapour pressure of octane, \(\begin{array}{l} p^{\circ}_{2}p2∘ \end{array} \) = 46.8 kPa... View Article
Which of the following statements in relation to the hydrogen atom is correct? (a) 3s, 3p and 3d orbitals all have the same energy (b) 3s and 3p orbitals are of lower energy than 3d orbital (c) 3p orbital is lower in energy than 3d orbital (d) 3s orbital is lower in energy than 3p orbital
The correct answer is (d) 3s orbital is lower in energy than 3p orbital In a hydrogen atom, 3s,3p and... View Article
A ball moving with velocity 2m/s collides head on with another stationary ball of double the mass. If the coefficient of restitution is 0.5, then their velocities (inm/s) after collision will be (a) 0,1 (b) 1,1 (c) 1, 0.5 (d) 0,2
The correct answer is (a) 0,1 Solution As per the given data m1 = m, m2 = 2m u1= 2... View Article
A train overtakes two persons who are walking in the same direction in which the train is going, at the rate of 2 kmph and 4 kmph and passes them completely in 9 and 10 second respectively. The length of the train is. (1) 45 metres (2) 40 metres (3) 54 metres (4) 50 metres
The correct answer is (4) 50 metres Solution Let the length of train be x km Let the speed of... View Article
The electrons identified by quantum numbers n and l, (i) n=4,l=1, (ii) n=4,l=0 (iii) n=3,l=2 and (iv) n=3,l=1 can be placed in order of increasing energy as (a) (i) < (ii) < (iii) < (iv) (b) (iv) < (iii) < (ii) < (i) (c) (iv) < (ii) < (iii) < (i) (d) (iv) < (i) < (ii) < (iii)
The correct answer is (c) (iv) < (ii) < (iii) < (i) Solution The greater is the value of (n+l), the greater... View Article
What is number system?
A number system is defined as a system of writing to express numbers. It is the mathematical notation for representing... View Article
In a town of 10,000 families, it was found that 40% of the families buy newspaper A, 20% buy newspaper B, 10% buy newspaper C, 5% buy A and B; 3% buy B and C, and 4% buy A and C. IF 2% buy all the three newspapers, find the number of families which buy (i) A only, (ii) B only, (iii) none of A, B, and C.
Given Total number of families = 10000 Percentage of families that buy newspaper A = 40 Percentage of families that... View Article
Lattice energy of an ionic compound depends upon (a) charge on the ion only (b) size of the ion only (c) packing of the ion only (d) charge and size of the ion.
The correct answer is (d) charge and size of the ion. Solution Lattice energy Lattice energy can be defined as... View Article
Cyanide process is used in the extraction of (a) gold (b) silver (c) both of these (d) none of these
The correct answer is (c) both of these Solution The cyanide process is used for the extraction of Au and... View Article
The species having pyramidal shape is:(A) SO3
(B) BrF3
(C) SiO32−(D) OSF2
The correct answer is (D) OSF2 Solution From VSEPR theory we get to know that SO2 is sp2 hybridized with three bond pairs and... View Article
The 0° Meridian is also known as_________
The 0° Meridian is also known as Prime Meridian. Let us know more about prime meridian The meridian which passed through... View Article
Suppose the charge of a proton and an electron differ slightly. One of them is -e, the other is (e + Δe). If the net of electrostatic force and the gravitational force between two hydrogen atoms placed at a distance d (much greater than atomic size) apart is zero, then Δe is of the order of [Given: mass of hydrogen mh = 1.67 x 10-27 kg] (a) 10-23 C (b) 10-37 C (c) 10-47 C (d) 10-20 C
The correct answer is (d) 10-20 C Solution mh=1.67×10−27kg The net charge on hydrogen atom q=(e+Δe)−e=Δe Let us assume the... View Article
Between 1 and 31, m numbers have been inserted in such a way that the resulting sequence is an A.P. and the ratio of 7th and (m – 1)th numbers is 5: 9. Find the value of m.
An arithmetic sequence or progression is defined as a sequence of numbers in which for every pair of consecutive terms,... View Article
If α and β are the roots of the equation ax2 + bx + c = 0, then α / [ɑβ + b] + β / [aɑ + b] =
A quadratic equation is an equation of degree 2, meaning that the highest exponent of this function is 2. The... View Article
How many months have 31 days?
The months having 30 days in a year are April, June, September, and November. What is a month? The month... View Article
What are the componenets of a vector?
The components of a vector in two dimension coordinate system are usually considered to be x-component and y-component. It can be represented... View Article
What are consecutive numbers
Consecutive numbers are those numbers that follow each other. They follow in a sequence or in order. For example, a... View Article
What is Pi?
Pi is a mathematical concept which represents the ratio between the circumference and the diameter of a circle. The pi... View Article
