All questions

• Jijamata Udyan, the famous zoo in Mumbai has acclimatised humbolt penguins. Zoological park (zoo) is a type of ex-situ conservation in which wild animals are kept in captivity. Humboldt penguins are native to South A... Living World 1 answer
• Distinguish between botanical gardens, zoological park and biodiversity park with reference to characteristics Botanical Gardens Zoological Parks Biodiversity Parks Plants of different varieties collected from different parts of the world are grown in... Living World 1 answer
• A group of students found two cockroaches in the classroom. They had a debate whether they are alive or dead. (c) Irritability Living World 2 answers
• A particular plant is strictly seasonal plant. Which one of the following is best suited if it is to be studied in the laboratory (a) Herbarium Living World 2 answers
• Which is not a property of living being? a. Metabolism b. Decay c. Growth d. Reproduction correct option is b. Decay Living World 2 answers
• The angle of 1" (second of arc) in a radian is equal to: (1) 4.85 × 10–4 (2) 4.85 × 10–6 (3) 1.75 × 10–2 (4) 1.75 × 10–4 A minute of arc is πover 10800 of a radian. A second of arc, arcsecond (arcsec), or arc second, denoted by the symbol ″, is 1over60 of an ar... Physics 1 answer
• How the atomic size vary in a group and across a period? Explain with suitable example. Answer: Atomic size increases down a group and decreases from left to right across a period. Down a group: each new element has one more she... Modern Periodic Table 1 answer
• Define ionization enthalpy. Name the factors on which ionisation enthalpy depends? How does it vary down the group and across a period? Variation of ionization energy down the group: On moving down the group, the ionization enthalpy decreases. This is because the electron is... Modern Periodic Table 2 answers
• What are the valence electrons ? For s-block and p-block elements show that number of valence electrons is equal to its group number. Electrons present in the outermost shell of the atom of an element are called valence electrons. 3Li is an s-block element and its electroni... Modern Periodic Table 1 answer
• Compare chemical properties of metals and non metals. The difference in chemical properties between metals and nonmetals. Nonmetals Metals 1. Nonmetals form acidic or neutral oxides when they re... Modern Periodic Table 1 answer
• Explain : electronegativity and electron gain enthalpy. Which of the two can be measured experimentally? The ability of a covalently bonded atom to attract the shared electrons toward itself is called electronegativity (EN). Electronegativity ca... Modern Periodic Table 1 answer
• Why the elements belonging to the same group do have similar chemical properties ? Chemical properties of elements depend upon their valency.Elements belonging to the same group have the same valency. Hence, the elements be... Modern Periodic Table 1 answer
• Why the second ionization enthalpy is greater than the first ionization enthalpy ? The second ionization enthalpy (Δ_iH₂) is greater than the first ionization enthalpy (Δ_iH₁) as it involves removal of electron from the pos... Modern Periodic Table 1 answer
• Explain the screening effect with a suitable example. In a multi-electron atom, the electrons in the inner shells tend to prevent the attractive influence of the nucleus from reaching the outerm... Modern Periodic Table 1 answer
• Ionization enthalpy of Li is 520 kJ mol-1 while that of F is 1681 kJ mol-1. Explain. Both Li and F belong to period 2. Across a period, the screening effect is the same while the effective nuclear charge increases. As a resul... Modern Periodic Table 1 answer
• La belongs to group 3 while Hg belongs to group 12 and both belong to period 6 of the periodic table. La and Hg both belong to period 6. Therefore, n = 6. Elements of group 3 to group 12 belong to the d-block of the modern periodic table. The... Modern Periodic Table 1 answer
• Write a e-mail, addressed to the class teachers and informing class teachers of a school about their Sample e-mail informing class teachers about the meeting on dress code From: discipline@abcschool.edu.in To: classteachers@abcschool.edu.in... Email writing 1 answer
• Write a e-mail, addressed to the principals of different schools located in the district/zone and informing the students Sample e-mail inviting schools to a three-day tree plantation campaign From: greencampaign.district@gmail.com To: principals.zone2@gmail.com... Email writing 1 answer
• You are the Principal of the school. Write an e-mail to parents of the students of classes IX-XII about the same. Email writing no answer
• Write a e-mail to all the residents and the members of the Gautam Nagar Residents’ Welfare Society giving information on the event. Email writing no answer
• Write an e-mail to a prominent football coach of your city who has agreed to be the referee at the event, giving all relevant details. Email writing no answer
• Write a e-mail instructing the residents of a colony to maintain cleanliness in the park in their neighbourhood. Sample e-mail requesting residents to keep the neighbourhood park clean From: secretary.rwa.greenpark@gmail.com To: seniorcitizens.greenpark... Email writing 1 answer
• Write an e-mail to the General Manager of the supermarket seeking permission to display the notice and requesting a sponsorship for the event. Email writing no answer
• Write an e-mail, addressing teachers in-charge of different classes that will participate in the function. Sample e-mail announcing auditions for the dramatics competition From: culturalsecretary@abcschool.edu.in To: classteachers@abcschool.edu.in... Email writing 1 answer