Holy Cross School, Agartala
Half yearly Examination – 2025
Subject: chemistry (Mock question)
Class: VI
Full marks (mock)- 40 marks
Time – 2 hours
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SECTION A (mark-20)
All the questions are compulsory
A. Choose the correct answer: (5*1=5)
1. Which of the following protects our skin from harmful sunrays?
a. Sunscreen b. Neem c Moisturize d. Talcum powder
2. Who developed the atomic theory of matter?
a. Robert Boyle b. John Dalton c. Antoine Lavoisier d. Sir Humphry Davy
3. When a gas is transferred from a small container to a big container, it occupies all the available space.
Choose the correct reason for this.
a. The particles of gas are free to move anywhere
b. The particles of gas has fixed shape
c. The particles of gas has strong interparticle force
d. All of these
4. Which of the following is correctly matched?
a. Silver-non-metal b. Salt-compound c. Phosphorus – metal d.water- mixture
5. Which of the following statements is incorrect?
a. The particles of matter are very, very small
b. The particles of matter attract one another
C. Only some of the particles within matter move
d. The particles of all the matter have spaces between them
B. Name the following: (2*1=2)
1. The process in which particles of matter gain energy and move rapidly on heating.
2. Name a natural antiseptic.
C. Match the following: (3*1=3)
1. Ice a) Pb
2. Enamal b) 0 degree
3. Lead c) camphor
4. sublimate d) high gloss oil
D. Write the symbols of the following: (2*1=2)
1. Hydrogen
2. Sodium
E. Write the chemical formula: (2*1=2)
1. lead oxide
2. Sand)
F. Fill in the blanks: (2*1=2)
1.The temperature at which liquid changes into vapour is its _________.
2. Glass is made of _________
G. Write the atomicity of the following: (2*1=2)
1. Helium
2. Oxygen
H. Write is the statements are true or false : (2*1=2)
1. Matter occupies space and time
2. Prafulla Chandra Roy was the founder of India’s first pharmaceutical company.
SECTION B
Total six set of questions are present. Answer only four set of question.
I. Answer the following questions : (2+2+1)
1. How is chemistry helpful in medicine?
2. Define “ Matter” and “cohesion”.
3. What is inert gas? Give example.
J. Answer the following questions : (2+3)
1. Explain “Monovalent” and “divalent”
2. Why do solid liquid and gas have different properties? Explain giving examples.
K. Answer the following questions : (2+2+1)
1. Name two chemical preservatives. Why are they used?
2. Explain “pure substance and elements”.
3. Name one common substance which can be easily changed from one state to another on cooling.
L. Answer the following questions : (2+3)
1. Explain two products used in construction.
2. Differentiate between Solid, liquid and gas. (two points each)
M. Answer the following questions : (2+2+1)
1. Define
a) freezing b) fermentation
2. Name two metals that are soft.
3. Differentiate between soap and detergent
N. Answer the following questions : (2+3)
1.Explain the role of chemistry in clothing.
2. Differentiate between metals and non-metals.
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