Archives

The ratio among most probable velocity, mean velocity and root mean square velocity is given by:(a) 1: 2: 3(b) 1: √2: √3(c) √2: √3: √8/π(d) √2: √8/π: √3

Most probable velocity, Average velocity, Root Mean Square velocity, Therefore, Hence, the correct option is (d) ... View Article

The most precise test of liquidity is (a) Quick ratio (b) Current ratio (c) Absolute liquid ratio (d) None of the above

The most precise test of liquidity is 'Absolute liquid ratio'. Therefore, the correct option is (c) ... View Article

A jet plane is travelling towards west at a speed of 1800 km/h. What is the voltage difference developed between the ends of the wing having a span of 25 m, if the Earth’s magnetic field at the location has a magnitude of 5 x 10^-4 T and the dip angle is 30⁰?

Solution: A jet plane is travelling towards west V = 1800 km/h V = (1800 x 1000)/ (60 x 60) We get, V = 500 m/s Earth's field, B = 5 x 10-4... View Article

Find two solution of the equation 3x – 2y = 5

Given 3x - 2y = 5 Let us put x = 3 and y = 2 in LHS We get, 3(3) - 2(2) = 5 9 - 4 = 5 5 = 5 Here, LHS = RHS Hence, one of the solution is (3, 2)... View Article

The electric potential at a point in free space due to charge Q coulomb is Q x 10¹¹ V. The electric field at that point is (1) 12πε₀ Q x 10²² Vm^-1 (2) 4πε₀ Q x 10²² Vm^-1 (3) 12πε₀ Q x 10²⁰ Vm^-1(4) 4πε₀ Q x 10²⁰ Vm^-1

Answer: (2) 4πε0 Q x 1022 Vm-1 Here, Hence, E = potential / r Therefore, What is meant by saying that the potential... View Article

is normal to the circle x² + y² + 4x + 1 = 0, then the maximum value of ab is(a) 4(b) 2(c) 1(d) None of these">If a tangent of slope 2 of the ellipse
$frac{x^{2}}{a^{2}} + frac{y^{2}}{b^{2}} = 1$
is normal to the circle x² + y² + 4x + 1 = 0, then the maximum value of ab is(a) 4(b) 2(c) 1(d) None of these

A tangent of slope 2 to the ellipse is ----- (1) This is normal to the circle x2 + y2 + 4x + 1 = 0 ⇒ Equation (1) passes through the...

is normal to the circle x² + y² + 4x + 1 = 0, then the maximum value of ab is(a) 4(b) 2(c) 1(d) None of these">View Article

If 16% of a number is 72. Find the number

Consider the required number = X (16/100) x X = 72 X = (72 x 100)/16 We get, X = 450 Therefore, the required number is 450 Let us check 1%... View Article

Why does Wanda’s house remind Maddie of Wanda’s blue dress?

Wanda used to wear an old blue faded yet a clean dress to school every day. When Maddie saw the house, it reminded her that Wanda’s place... View Article

In 1999, the world population reached (a) 1 billion (b) 3 billion (c) 6 billion

In 1999, the world population reached 6 billion. Therefore, the correct option is (c) ... View Article

The hybridization of chlorine atom in CIF₃ molecule is: (a) sp (b) sp² (c) sp³ (d) sp³d

The hybridization of chlorine atom in CIF3 molecule is sp3d. Therefore the correct option is (d) Learn more: Chlorine Trifluoride... View Article

SI unit of conductivity is (a) Sm^-1 (b) Ss^-1 (c) Sm¹ (d) None of these

The SI unit of conductivity is siemens per meter (S/m). Hence the correct option is (a) i.e Sm-1... View Article

What is the feminine gender of lad?

The feminine form of lad is 'lass'.... View Article

State the principle of moving coil galvanometer

Moving Coil Galvanometer Principle A current-carrying coil when placed in an external magnetic field experiences magnetic torque. The angle... View Article

Differentiate between audible and inaudible sounds

Audible sound 1. The sounds of frequency which are audible to the human ear is known as audible sound 2. The frequency of audible sounds is... View Article

Find the derivative of 1/√x

Let us consider f(x) = 1/√x y = 1/u and u = x1/2 Since √x = x 1/2 On simplification, we get, y = u and u = x-1/2 According to chain... View Article

Why does O₃ act as a powerful oxidising agent?

Ozone is actually not a very stable compound in normal conditions. It decomposes readily on heating to form a molecule of oxygen along with... View Article

A concrete sphere of radius R has cavity of radius r which is packed with saw-dust. The specific gravitites of concrete and sawdust are 2.4 and 0.3 respectively. The sphere floats with its entire volume sub-merged under water. Calculate the ratio of mass of concrete and the mass of saw-dust.(a) 1(b) 2(c) 3(d) 4

The specific gravities of concrete and sawdust are ρ1 and ρ2 respectively Given ρ1 = 2.4 and ρ2 = 0.3 According to principle of... View Article

to
$vec{r_{2}} = (4hat{i}+6hat{j})m$
under a force
$vec{F} = (3x^{2}hat{i}+2yhat{j})N$
then work done by the force is">An object is displaced from position vector
$vec{r_{1}} = (2hat{i}+3hat{j})m$
to
$vec{r_{2}} = (4hat{i}+6hat{j})m$
under a force
$vec{F} = (3x^{2}hat{i}+2yhat{j})N$
then work done by the force is

(a) 24 J (b) 33 J (c) 83 J (d) 45 J Work done is given by, W = (64 - 8) + (36 - 9) W = 56 + 27 We get, W = 83 J...

$vec{r_{2}} = (4hat{i}+6hat{j})m$

under a force

$vec{F} = (3x^{2}hat{i}+2yhat{j})N$

then work done by the force is">View Article

Which molecule contains both polar and nonpolar covalent bond?(a) NH₄Br(b) H₂O₂(c) CH₄(d) HF

The correct answer is (b) H2O2 In H2O2, the electronegativity difference between O and H atoms is 1.4, O – H bond is polar. The... View Article

Total number of muscles in our body is

The human muscular system includes more than 600 muscles, which makes up about 40 to 50 per cent of the total body weight. These muscles are... View Article

M	T	W	T	F	S	S
			1	2	3	4
5	6	7	8	9	10	11
12	13	14	15	16	17	18
19	20	21	22	23	24	25
26	27	28	29	30	31