Latest Posts

The osmotic pressure of blood is 7.65 atm. at 310 K. An aqueous solution of Glucose that will be isotonic with blood is what wt/vol?

Answer: 54.162g/liter Osmotic pressure can be defined as the minimum pressure that must be applied to a solution to halt... View Article

According to Bohr orbital theory, the angular momentum of electron in 5th orbit is (1) 25h/π (2) 1h/π (3) 10h/π (4) 2.5h/π

Answer: 4) 2.5h/π Bohr theory Applicable to modified the atomic structure model by explaining that electrons move in fixed orbitals... View Article

A watch gains 5 seconds in 3 minutes was set right at 7 A.M In the afternoon of the same day, when the watch shows quarter past 4 o’clock, the true time is ______________.

Answer: 4 P.M Time from 7 A.M to 4.15 P.M = 9 hours 15 minutes = 37/4 3 minutes 5... View Article

In faintly or neutral alkaline solution, 8 moles of permaganate anion quantitative oxidize thiosulphate anions to produce X moles of a sulphur containing product. The magnitude of X is______

Answer: 6 moles A solution of a soluble base with pH greater than 7 is called as an alkaline solution.... View Article

If x + y = k is normal to y² = 12x, then k=? (1) 3 (2) 6 (3) 9 (4) None of these

Answer: (3) 9 The normal to a parabola is perpendicular to the tangent of the parabola. Also, it will pass... View Article

From the below figure which of the following is not the graph of a quadratic polynomial?

A B C D Answer: (D) A quadratic polynomial is a polynomial of degree two, i.e., the highest exponent... View Article

If the earth were to suddenly contract to 1/n^th if its present radius without any change in its mass, the duration of the new day will be nearly (1) 24/n hr (2) 24nhr (3) 24/n²hr (4) 24n²hr

Answer: (3) 24/n2hr Let the Mass aof the earth = M Radius of the earth = R \(\begin{array}{l}I_{1}= \frac{2}{5}MR^{2}\end{array} \).... View Article

The freezer in a refrigerator is located at the top section so that ________. (1) The motor is not heated (2) The heat gained from the environment in high (3) The heat gained from the environment is low (4) The entire chamber of the refrigerator is cooled quickly due to convection

Answer: (4) The entire chamber of the refrigerator is cooled quickly due to convection Freezer is the source for the... View Article

Which of the following pair of ores cannot be converted into corresponding metals by pyrometallurgy? (1) Ag2S,ZnS (2) Cu2S,HgS (3) MnO2,SnO2 (4) None of this

Answer: (1) Ag2S,ZnS Pyrometallurgy is a branch of extractive metallurgy. It consists of the thermal treatment of minerals and metallurgical... View Article

A car weighing 100 kg is on a slope that makes an angle 30⁰with the horizontal. The component of car’s weight parallel to the slope is (g = 10ms⁻², g = 10ms⁻²) (1) 500 N (2) 1000 N (3) 15000 N (4) 20000 N

Answer: (1) 500 N Scalar and vector quantities are the two types of quantities. Scalar quantities (speed, time, temperature, and... View Article

An organic compound undergoes first-order decomposition. The time taken for its decomposition to 1/8 and 1/10 of its initial concentration at t1/8and t1/10 respectively. What is the value of t1/8 /t1/10 × 10? (Consider log102=0.3) (1) 9 (2) 8 (3) 10 (4) 15

Answer:(1) 9 A first-order reaction can be defined as a chemical reaction in which the reaction rate is linearly... View Article

Two batteries of different e.m.fs and different internal resistances are connected as shown in the figure below. The voltage across AB in volts is (1) 4 (2) 5 (3) 6 (4) 7

Answer: (2) 5 The positive terminal connects the two cells, which have varying internal resistance. From the higher potential to... View Article

How to find the Least Common Multiple(LCM)?

Answer: Least Common Multiple (LCM) is a way of finding the smallest common multiple between any two numbers or more.... View Article

The correct value of the gas constant R is close to (1) 0.082litre−atmK (2) 0.082litre−atmK⁻¹mol⁻¹ (3) 0.082litre−atm⁻¹Kmol⁻¹

Answer: (2) (2) 0.082litre−atmK−1mol−1 In physics, the gas constant (R) is defined as the product of pressure and volume. It... View Article

Which of the following series in the spectrum of hydrogen atom lies in the visible region of the electromagnetic spectrum? (1) Paschen series (2) Balmer series (3) Lyman series (4) Brackett series

Answer: (2) Balmer series The Balmer series was discovered during the years 1885, by Johann Balmer. Thus the series is... View Article

A bird moves with velocity 20ms⁻¹ in a direction making an angle of 60⁰ with the eastern line and 60⁰ with vertical upward. Represent the velocity vector in rectangular form.

Answer: velocity = 20 m/s Eastern angle = 600 Vertical angle = 600 Let α, β and r be the... View Article

If two coherent light waves produce minima of fifth order, the path dfference between the waves is (1) 5λ (2) 5λ/2 (3) 7λ/2 (4) 9λ/2

Answer: (4) 9λ/2 Given: Two coherent light waves produce minima of fifth order Path difference for destructive order = (2n... View Article

The areas of two similar triangles ABC and DEF are 144cm² and 81cm², respectively. If the longest side of larger triangle ABC is 36 cm, then the longest side of the smaller triangle DEF is (1) 20 cm (2) 26 cm (3) 27 cm (4) 30 cm

Answer: (3) 27 cm If two triangles are similar, then the ratio of the area of both triangles is proportional... View Article

A capacitor is charged with a battery and energy stored is U. After disconnecting battery another capacitor is of same capacity is connected in parallel with it. Then energy stored in each capacitor is (1) U/2 (2) U/4 (3) 4U (4) 2U

Answer: (2) U/4 he capacitor is a device in which electrical energy can be stored. It is an arrangement of... View Article

The product formed in the reaction of SOCl2 with white phosphorus is? (1) PCl3 (2) SO2Cl2 (3) SCl2 (4) POCl3

Answer: (1) PCl3 Phosphorus is found in number of allotropic forms in which well recognised are being black,red and white.... View Article

«
1
…
619
620
621
622
623
…
5,472
»