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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 2751. |
Hydrogen in its molecular forms exists as ________ gas. |
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Answer» Hydrogen in its molecular forms exists as ________ gas. |
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| 2752. |
Explain physical state and hardness of metals. Write exceptions in each case. [3 MARKS] |
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Answer» Explain physical state and hardness of metals. Write exceptions in each case. [3 MARKS] |
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| 2753. |
When carbonates are reacted with HCl, the gas evolved is: |
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Answer» When carbonates are reacted with HCl, the gas evolved is: |
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| 2754. |
The movement of molecules close to a source of heat away from it and of those molecules which are away from the source of heat towards the source is called ____________. |
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Answer» The movement of molecules close to a source of heat away from it and of those molecules which are away from the source of heat towards the source is called ____________. |
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| 2755. |
ntif enthalpies of formation for c2h4 (g) ,co2 (g) and h2o (l) at 25 degree centigrade 1 atm pressure are 52, -394 and -286 kj/mol respectively, then enthalpy of combustion of c2h4(g), will be n |
| Answer» ntif enthalpies of formation for c2h4 (g) ,co2 (g) and h2o (l) at 25 degree centigrade 1 atm pressure are 52, -394 and -286 kj/mol respectively, then enthalpy of combustion of c2h4(g), will be n | |
| 2756. |
Name any harmful product released by the burning of fuels. |
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Answer» Name any harmful product released by the burning of fuels. |
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| 2757. |
In which of the following chemical species hyperconjugation is not possible |
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Answer» In which of the following chemical species hyperconjugation is not possible |
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| 2758. |
The metal which will not produce hydrogen gas on reacting with dilute sulphuric acid is : (a) sodium (b) silver (c) iron (d) zinc |
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Answer» The metal which will not produce hydrogen gas on reacting with dilute sulphuric acid is : (a) sodium (b) silver (c) iron (d) zinc |
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| 2759. |
What is the process used to obtain pure water for industrial purpose and why? [2 MARKS] |
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Answer» What is the process used to obtain pure water for industrial purpose and why? |
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| 2760. |
alane is chemically-1)AlH3 2)(AlH3)n 3)LiAlH4 4)NONE EXPLAIN WITH REASON |
| Answer» alane is chemically-1)AlH3 2)(AlH3)n 3)LiAlH4 4)NONE EXPLAIN WITH REASON | |
| 2761. |
Why burning of NH4CL is both chemical and physical changes? |
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Answer» Why burning of NH4CL is both chemical and physical changes? |
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| 2762. |
How is cement made? |
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Answer» How is cement made? |
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| 2763. |
"Gravitational force doesn't depends on intervening medium." What is intervening medium? |
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Answer» "Gravitational force doesn't depends on intervening medium." What is intervening medium? |
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| 2764. |
5g of Mn 2nd on reaction with HCl forms 1.12L of Cl2 gas at STP.The %impurity of Mn 2nd is? |
| Answer» 5g of Mn 2nd on reaction with HCl forms 1.12L of Cl2 gas at STP.The %impurity of Mn 2nd is? | |
| 2765. |
A mixture of iodine and sand can be separated by the process of ___ |
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Answer» A mixture of iodine and sand can be separated by the process of |
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| 2766. |
Electroagnets are used specially for which purpose specifically. |
| Answer» Electroagnets are used specially for which purpose specifically. | |
| 2767. |
Name one substace which can exist in all three states also mention its form in solid, liquid and gas. |
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Answer» Name one substace which can exist in all three states also mention its form in solid, liquid and gas. |
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| 2768. |
Which among the following is/are example of reversible change? |
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Answer» Which among the following is/are example of reversible change? |
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| 2769. |
Mention any three changes that take place in our body. |
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Answer» Mention any three changes that take place in our body. |
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| 2770. |
An astronaut gets thirsty on the moon. So, he uses a special equipment to make water by combining hydrogen and oxygen. What can you say about this water made on the moon? |
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Answer» An astronaut gets thirsty on the moon. So, he uses a special equipment to make water by combining hydrogen and oxygen. What can you say about this water made on the moon? |
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| 2771. |
A wall is made of equally thick layers A and B ofdifferent materials. Thermal conductivity of A istwice that of B. In the steady state, the temperature difference across the wall is 36^° C. The temperaturedifference across the layer A is(a) 12 ^° C(c) 6 ^° C(b) 18 ^° C(d) 24 ^° C |
| Answer» A wall is made of equally thick layers A and B ofdifferent materials. Thermal conductivity of A istwice that of B. In the steady state, the temperature difference across the wall is 36^° C. The temperaturedifference across the layer A is(a) 12 ^° C(c) 6 ^° C(b) 18 ^° C(d) 24 ^° C | |
| 2772. |
Identify the odd one among the following: Hydrogen, Oxygen, Chlorine and Bromine |
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Answer» Identify the odd one among the following: Hydrogen, Oxygen, Chlorine and Bromine |
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| 2773. |
If Not and Unless • Imagine that Margie’s mother told her, “You’ll feel awful if you don’t finish your history lesson.” • She could also say: “You’ll feel awful unless you finish your history lesson.” Unless means if not. Sentence with unless or if not are negative conditional sentences. Notice that these sentences have two parts. The part that begins with if not or unless tells us the condition. The part has a verb in the present tense (look at the verbs don’t finish, finish in the sentences above.) The other part of the sentence tells us about a possible result. It tells us what will happen (if something doesn’t happen). The verb in this part of the sentence is in the future tense (you'll feel/ you will feel). Notice these two tenses in the following examples. Future Tense Present Tense • There won’t be any books left unless we preserve them. • You won’t learn your lessons if you don’t study regularly. • Tommy will have an accident unless he drives more slowly. Complete the following conditional sentences. Use the correct form of the verb. 1. If I don’t go to Anu’s party tonight, __________. 2. If you don’t telephone the hotel to order food, __________. 3. Unless you promise to write back, I __________. 4. If she doesn’t play any games, __________. 5. Unless that little bird flies away quickly, the cat __________. |
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Answer» If Not and Unless • Imagine that Margie’s mother told her, “You’ll feel awful if you don’t finish your history lesson.” • She could also say: “You’ll feel awful unless you finish your history lesson.” Unless means if not. Sentence with unless or if not are negative conditional sentences. Notice that these sentences have two parts. The part that begins with if not or unless tells us the condition. The part has a verb in the present tense (look at the verbs don’t finish, finish in the sentences above.) The other part of the sentence tells us about a possible result. It tells us what will happen (if something doesn’t happen). The verb in this part of the sentence is in the future tense (you'll feel/ you will feel). Notice these two tenses in the following examples.
Complete the following conditional sentences. Use the correct form of the verb. 1. If I don’t go to Anu’s party tonight, __________. 2. If you don’t telephone the hotel to order food, __________. 3. Unless you promise to write back, I __________. 4. If she doesn’t play any games, __________. 5. Unless that little bird flies away quickly, the cat __________.
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| 2774. |
[a+1/b]^m*[a-1/b]^n/[b+1/a]^m*[b-1/a]^n=[a/b]^m+n |
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Answer» [a+1/b]^m*[a-1/b]^n/[b+1/a]^m*[b-1/a]^n=[a/b]^m+n |
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| 2775. |
Which of the following is used for the preparation of neon sign tubings? |
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Answer» Which of the following is used for the preparation of neon sign tubings? |
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| 2776. |
Question 14Choose the incorrect statement from the following. A good fuel is one which:(a) is readily available.(b) produces a large amount of heat.(c) leaves behind many undesirable substances.(d) burns easily in the air at a moderate rate. |
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Answer» Question 14 Choose the incorrect statement from the following. A good fuel is one which: (a) is readily available. (b) produces a large amount of heat. (c) leaves behind many undesirable substances. (d) burns easily in the air at a moderate rate. |
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| 2777. |
Question 2Why is it better to avoid the use of plastic products? |
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Answer» Question 2 Why is it better to avoid the use of plastic products? |
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| 2778. |
How many moles of aluminium sulphate will contain 0.24 moles of oxygen atoms ? |
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Answer» How many moles of aluminium sulphate will contain 0.24 moles of oxygen atoms ? |
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| 2779. |
Name two metals which are used to make jewellery. |
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Answer» Name two metals which are used to make jewellery. |
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| 2780. |
what is a 'zwitterionic form' reaction |
| Answer» what is a 'zwitterionic form' reaction | |
| 2781. |
Read the passage and identify the sentences expressing types of pollution.Nilesh is a student of std. VIII and lives in urban area. It takes about an hour to go to the school by bus. He faces the heavy traffic of two wheelers, four wheelers, rickshaws, buses while going to school. He is facng the problem of asthma since to stay away from urban area. Since then, his mother sent him to the village of his maternal uncle. Nilesh saw th heaps of garbage of many places in village. Foul smell of human and animal wastes was present at many places. Blackish water with foul smell was flowing in a stream. He devleoped some abdominal disease with in few days. |
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Answer» Read the passage and identify the sentences expressing types of pollution. Nilesh is a student of std. VIII and lives in urban area. It takes about an hour to go to the school by bus. He faces the heavy traffic of two wheelers, four wheelers, rickshaws, buses while going to school. He is facng the problem of asthma since to stay away from urban area. Since then, his mother sent him to the village of his maternal uncle. Nilesh saw th heaps of garbage of many places in village. Foul smell of human and animal wastes was present at many places. Blackish water with foul smell was flowing in a stream. He devleoped some abdominal disease with in few days. |
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| 2782. |
Try to find it a. Plastic shows ............... property, hence it can be molded to any shape.b. Motor cars are coated with .................c. Thermocoal melts at .............. ∘C. d. ................ glass dissolves in water. |
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Answer» Try to find it a. Plastic shows ............... property, hence it can be molded to any shape. b. Motor cars are coated with ................. c. Thermocoal melts at .............. ∘C. d. ................ glass dissolves in water. |
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| 2783. |
Arrange solid, liquid and gas on the basis of the rate of diffusion in ascending order. |
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Answer» Arrange solid, liquid and gas on the basis of the rate of diffusion in ascending order. |
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| 2784. |
In which of the following processes CO2 is involved? |
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Answer» In which of the following processes CO2 is involved? |
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| 2785. |
List any three characteristics of a good fuel. [3 MARKS] |
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Answer» List any three characteristics of a good fuel. [3 MARKS] |
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| 2786. |
Question 1:What are the common three states in which matter is found in nature? |
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Answer» Question 1: What are the common three states in which matter is found in nature? |
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| 2787. |
18. The enthalpy of combustion of hydrogen cyclohexene and cyclohexane are -241,-3800,-3920kjper mol resp heat of hydrogenation of cyclohexene |
| Answer» 18. The enthalpy of combustion of hydrogen cyclohexene and cyclohexane are -241,-3800,-3920kjper mol resp heat of hydrogenation of cyclohexene | |
| 2788. |
Explain how petroleum is formed with the help of a diagram. |
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Answer» Explain how petroleum is formed with the help of a diagram. |
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| 2789. |
Can pickles be stored in container? |
| Answer» Can pickles be stored in container? | |
| 2790. |
3. For a solution if pA 600 mm Hg. PB 840 mm Hg under atmospheric conditions and vapourpressure of solution is 1 atm then find(i) Composition of solution(i) Composition of vapour in equilibrium with solution |
| Answer» 3. For a solution if pA 600 mm Hg. PB 840 mm Hg under atmospheric conditions and vapourpressure of solution is 1 atm then find(i) Composition of solution(i) Composition of vapour in equilibrium with solution | |
| 2791. |
Which is the pollution which causes the least pollution |
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Answer» Which is the pollution which causes the least pollution |
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| 2792. |
Which of the following is not a hard water? |
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Answer» Which of the following is not a hard water? |
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| 2793. |
What is variable valency ? Name two elements having variable valency and state their valencies. |
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Answer» What is variable valency ? Name two elements having variable valency and state their valencies. |
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| 2794. |
20 If P^° and P are the vapour pressure of solvent & solution n1 & n2 are the moles of solute & solvent then 1) P^° = P (n2 / n1 + n2) 2) P = P^° (n2 / n1 + n2) 3) P^° = P (n1 / n1 + n2) 4) P^° = P * n1 |
| Answer» 20 If P^° and P are the vapour pressure of solvent & solution n1 & n2 are the moles of solute & solvent then 1) P^° = P (n2 / n1 + n2) 2) P = P^° (n2 / n1 + n2) 3) P^° = P (n1 / n1 + n2) 4) P^° = P * n1 | |
| 2795. |
Question 26 Fill in the blanks using the words given in the box. (a) A chemical process in which a substance reacts with oxygen to give off heat is called ___ (b) Wood, paper, CNG are ___ substances. (c) The lowest temperature at which a substance catches fire is called its ___ temperature. (d) Ignition temperature of ___ is lower than that of wood. (e) The substances which have very low ___ temperature and can easily catch fire with a flame are called ___ substances. (f) The amount of heat energy produced on complete combustion of 1kg of a fuel is called its ___. |
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Answer» Question 26 Fill in the blanks using the words given in the box.  (a) A chemical process in which a substance reacts with oxygen to give off heat is called (b) Wood, paper, CNG are (c) The lowest temperature at which a substance catches fire is called its (d) Ignition temperature of (e) The substances which have very low (f) The amount of heat energy produced on complete combustion of 1kg of a fuel is called its |
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| 2796. |
Outside a nucleus |
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Answer» Outside a nucleus |
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| 2797. |
latent heat of fusion of ice is 0.333kJg∧1. the increase in entropy when 1 mol water melts at 0 degree celcius |
| Answer» latent heat of fusion of ice is 0.333kJg∧1. the increase in entropy when 1 mol water melts at 0 degree celcius | |
| 2798. |
Vijay is pulling a block with 22 N force and Gopal is pulling it with 10 N force in opposite direction. The block moves a distance of 6.5 m. Find the net work done. |
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Answer» Vijay is pulling a block with 22 N force and Gopal is pulling it with 10 N force in opposite direction. The block moves a distance of 6.5 m. Find the net work done. |
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| 2799. |
Question 5:Fill in the blanks:Air is a matter because it has ________and _____and it can be_________ _.(b) The molecules are made up of _______.(c) The quantity of matter in an object is called it’s _______. |
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Answer» Question 5: Fill in the blanks: Air is a matter because it has ________and _____and it can be_________ _. (b) The molecules are made up of _______. (c) The quantity of matter in an object is called it’s _______. |
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| 2800. |
Fill in the blanks. (a) ………… is a good conductor of heat and electricity. (b) Fullerene is an ………… of carbon. (c) ………… turns limewater milky. (d) Charcoal is an ………… of carbon. (e) Diamond is a ………… conductor of electricity. (d) A biogas plant produces ………… gas. |
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Answer» Fill in the blanks. (a) ………… is a good conductor of heat and electricity. (b) Fullerene is an ………… of carbon. (c) ………… turns limewater milky. (d) Charcoal is an ………… of carbon. (e) Diamond is a ………… conductor of electricity. (d) A biogas plant produces ………… gas.
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