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Which of the following represents the correct composition of sweat?a)Water, Salts, Urea b)Water, Salt, Calcium c)Salt, Calcium, Phosphorous d)Water, Urea, Calcium

Answer Option (a)Water, Salts, Urea What is sweat? The skin of mammals comprises around four million sweat glands. They secrete... View Article

How will you separate a mixture containing kerosene and petrol (difference in their boiling points is more than 25ºC), which are miscible with each other? Solution

Answer: A mixture of two miscible liquids having a difference in their boiling points of more than 25 °C can... View Article

A hammer of mass 500 g, moving at 50 m/s, strikes a nail. The nail stops the hammer in a very short time of 0.01 s. What is the force of the nail on the hammer?

Answer: Mass of the hammer (m) = 500 g = 0.5 kg The initial velocity of the hammer (u) =... View Article

The distance between the school and the house of a student’s house is 1 km 875 m. Every day she walks both ways. Find the total distance covered by her in six days.

Given that Distance between school and home = 1875m Find out We have to find out the total distance covered by... View Article

Majority of the reactions of alkynes are the examples of _____. a. Addition reaction b. Redox Reaction c. Single Replacement Reaction d. Double Replacement Reaction

The majority of the reactions of alkynes are examples of (a) Addition reaction Explanation The chemistry connected with carbon-carbon triple... View Article

An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be Option A: 100 W Option B: 75 W Option C: 50 W Option D: 25 W

Answer Correct option: D 25 W Given that An electric bulb is rated 220 V and 100 W Find out The power... View Article

The valence shell of the element X contains 2 electrons in a 5s sub shell. Below that shell, element X has a partially filled 4d sub shell. What type of element is X?

Element X is a 5th-period transition element. Explanation Given that the element X contains 2 electrons in a 5s subshell. This... View Article

Which of the following is a major aspect of personal hygiene? i) Physical exercise ii) Washing hands after having food iii) Cleaning rooms everyday iv) None of the above

Answer option (i) Physical exercise Hygiene Hygiene can be described as the practice of a few habits in order to maintain... View Article

An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position of the image, its nature and size.

Radius of curvature (R) = 30 cm f = R/2 = 30/2 = 15 cm u = -20 cm, h=... View Article

Which of the following substances are strongly attracted by magnetic field?a. Ferromagnetic Material b. Diamagnetic Material c. Paramagnetic Material d. None of the above

Answer (a)Ferromagnetic substances are strongly attracted by the magnetic field. Ferromagnetism Ferromagnetic substances are those substances that when it’s located... View Article

An automobile vehicle has a mass of 1500 kg. What must be the force between the vehicle and road if the vehicle is to be stopped with a negative acceleration of 1.7 ms^-2?

Given Mass of the automobile vehicle (m) = 1500 kg Final velocity (v) = 0 (finally the automobile stops) Acceleration... View Article

A bomb of mass 16kg at rest, explodes into two pieces of masses 4kg and 12kg. After explosion, the velocity of the 12kg mass is 4m/s. What is the velocity of the 4kg piece?

Given that m1= 4kg m2= 12kg v2= 4m/s Find out The velocity of the 4kg piece Solution The momentum of... View Article

Which of the following is/are a characteristic of non-living things?a)No capability of growth b)They do not respond to stimuli c)They do not evolve or adapt to their environment d) all of these

The correct answer is option d) all of these Explanation What are non-living things? Non-living things are not alive. Things... View Article

Explain how sexual reproduction gives rise to more viable variations than asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually?

In the case of asexual reproduction, only the minimal changes due to inaccuracies in DNA copying pass on to the... View Article

An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.

Given that The height of object = 5cm Position of object, u = – 25cm The focal length of the... View Article

Which of the following hydrocarbon does not undergo addition reaction? C_{2H₆ C₃H₈ C₂H₂ CH₄}

C3H8 and CH4 do not undergo addition reaction. Since these two are unsaturated compounds the addition reaction takes place. Addition reaction An... View Article

Which of the following is not a case of chemical equilibrium? i) N2O4 gives 2NO2 ii) NH4Cl(aq) is aqueous solution of NH4Cl(s) iii) N2 + H2 gives 2NH3 iv) PCl5 gives PCl3 + PCl2

NH4Cl(aq) is aqueous solution of NH4Cl(s).

A battery of 9 V is connected in series with resistors of 0.2 Ohms, 0.3 Ohms, 0.4 Ohms, 0.5Ohms and 12Ohms respectively. How much current would flow through the 12 ohm resistors?

Given A battery of 9 V is connected in series with resistors of 0.2 Ohms, 0.3 Ohms, 0.4 Ohms, 0.5Ohms... View Article

What type of isomerism is present when positive and negative ions of a salt are complex ions and the two isomers differs in the distribution of ligands in the cation and the anion?

Coordination isomerism is present when positive and negative ions of salt are complexions and the two isomers differ in the distribution... View Article

Alloying is not done for which of the following purpose? a. To enhance the hardness of the metal b. To enhance the tensile strength c. To modify colour d. To raise the melting point

Alloying is not done for option d. To raise the melting point Definition of alloy An alloy is a substance formed... View Article

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