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An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down

Mass of the object = 40kg Height = 5m We need to find Potential energy and also its kinetic energy when it is half-way down Potential... View Article

Will the value of Specific latent heat of fusion of a Substance change if the temperature scale is changed from Celsius scale to Fahrenheit scale and from Celsius scale to kelvin scale ?

Fusion involves no change in Temperature as Fusion occurs at constant temperature which is the melting point of the substance. Hence change in... View Article

How do we think the displacement of rod AB will be affected if (i) current in rod AB is increased: (ii) a stronger horse-shoe magnet is used: and (iii) length of the rod AB is increased?

We have learnt that the force acted by a magnet on a current-carrying conductor depends on the following factors Strength of the magnetic... View Article

NaCl molecule is made of which of the following ions? a. Na⁺ and Cl^– b. Na^– and Cl⁺ c.N⁺ and C^– d. N⁺ and C^–

NaCl molecule is made of option a. Na+ and Cl- Sodium chloride is an ionic compound in which the sodium and chloride ions are in the ratio of... View Article

Using divisibility test, determine which of the following numbers are divisibly by 4; by 8: (a) 572 (b) 726352 (c) 5500 (d) 6000 (e) 12159 (f) 14560 (g) 21084 (h) 31795072 (i) 1700 (j) 2150

Let us first know about the divisibility rule If the last two digits of a number are divisible by 4, then that number is a multiple of 4 and is... View Article

Which of the following is significant while diagnosing a disease? a. Attire of the patient b.Language spoken by the patient c.Cultural background of the patient d.Symptoms shown by the patient

Option (d)Symptoms shown by the patient help in diagnosing the disease A disease is a condition that deteriorates the normal functioning of the... View Article

Which one of the following is an example of physical weathering? a. Frost Action b. Weathering due to the reaction between rock and water c. Tree roots fracturing the rock d. None of the above

Frost action is an example of physical weathering. Weathering denotes the process of wearing, breaking up, and fragmentation of the rock that... View Article

Which of the following is the characteristic feature of ferns? a. Ferns have seeds b. Plant body is differentiated into root, stem and leaves c. They have Tuberous roots d. Ferns are gametophytes

Their plant body is differentiated into root, stem and leaves.... View Article

(a) What do you do with left over food at home? (b) If you and your friends are given the choice of eating in a plastic plate or a banana leaf platter at a party, which one would you prefer and why?

Answer: (a) Leftover food can be collected and used to make compost. Compost provides nutrients essential for the growth and development of... View Article

A mass of 10 kg is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your solution

Answer: Work is said to be done when a force applied to an object moves that object. Work done is generally referred to in relation to the force... View Article

Which of the following is not a characteristic feature of mammals? (1) Mammals have four-chambered hearts (2) They have diaphragm (3) They are not warm-blooded animals (4) They have fur on their body

Answer: (3) They are not warm-blooded animals Mammaliae are species that belong to the Mammaliae class. Mammals are one of the most advanced... View Article

Which of the following is an example of double displacement reaction? i) AgNO3 + NaCl gives AgCl + NaNO3 ii) Zn + 2HCl gives ZnCl2 + H2 iii) CH4 + 2O2 gives CO2 + 4H2O iv) H2S + Cl2 gives 2HCl + S

AgNO3 + NaCl gives AgCl + NaNO3... View Article

A copper wire has a diameter of 0.5 mm and resistivity of 1.6 × 10^-8 Ohm m. What will be the length of this wire to make its resistance 10 Ohm? How much does the resistance change if the diameter is doubled?

Resistivity (ρ) = 1.6 × 10-8 Ω m Resistance (R) = 10 Ω Diameter (d) = 0.5 mm d = 5 × 10⁻⁴ m Hence, we will get radius Radius (r) = 0.25... View Article

On increasing resistance in a circuit, current in it _____. a. increases b. decrease c. increases upto a certain point and drastically decreases d. decrease upto a certain point and then increases rapidly

On increasing resistance in a circuit, the current in it decreases. The relation between current and resistance is given by Ohm's law. Ohm's... View Article

Which of the following is not a case of physical equilibrium? i) Formation of NH4OH ii) Conversion of water into vapour iii) Conversion of water vapour onto liquid water iv) None of these

Before getting to know which among the given process is not a case of physical equilibrium let us know about physical equilibrium. The... View Article

Which of the following property is not shown by covalent compounds? a. Low boiling points and melting points b.Brittle solids c. Covalent compounds are soluble in water d.Poor conductors of heat and electricity

Covalent compounds are soluble in water... View Article

Which one of the following correctly represents a food chain? a.Grass-Grasshopper-Frog-Snake-Eagle b.Grass-Grasshopper-Eagle-Snake-Frog c. Grass-Eagle-Frog-Snake-Grasshopper d. Grass-Snake-Frog-Eagle-Grasshopper

Grass --andgt;Grasshopper --andgt; Frog --andgt; Snake --andgt; Eagle... View Article

Which of the following is a characteristic feature of ferns? a. they have male and female cone b. they have needle shaped leaves c.they have rhizoids d. their plant body is differentiated into root, stem and leaves

Their body is differentiated into root, stem and leaves. This tissue helps in the conduction of water and other substances from part of the plant... View Article

Which of the following property is not shown by covalent compounds? a. Low boiling points and melting points b. Poor Conductors of Heat and Electricity c. The movement of covalnet bond is restricted d. Brittle Solid

c. Movement of covalent molecules is restricted. The covalent molecules move about freely and tend to exist as gases or liquids or soft liquids... View Article

Which of the following conditions is not necessary for burning? a. Presence of a combustil substance b. Presence of supporter of combustion c. Heating the combustible substance to its ignition temperature d. Presence of water

There should not be any water in the surrounding.... View Article

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