1. Which among the following statement is correct 1. Liquids also occupy some space and hence they also have volume. But liquids do not possess any definite shape. So, the volume of a liquid cannot be determined as in the case of solids. When a liquid is poured into a container, it takes the shape and volume of the container. 2. The volume of any liquid is equal to the space that it fills and it can be measured using a measuring cylinder or measuring beaker. The maximum volume of liquid that a container can hold is known as the “capacity of the container”. The volume of a liquid is equal to the volume of space it fills in the container. This can be directly observed from the readings marked in the measuring containers. 3. To understand this unit of volume, let us first understand how much a litre means. Litre is the commonly used unit to measure the volume of liquids. we can understand that the unit of volume is cubic cm if the dimensions of the object are given in cm. This cubic cm is commonly known as cc. A volume of 100 cc is termed as one litre (l). 1 litre = 100 cc or cm3 100 ml = 1 litre.
2. Which among the following statement is correct 1. A set of physical quantities which cannot be expressed in terms of any other quantities are known as “Derived quantities”. Their corresponding units are called “Derived units”. 2. All other derived quantities which can be obtained by multiplying, dividing or by mathematically combining the derived quantities are known as “Fundamental quantities”. Their corresponding units are called “Fundamental units.
3. Which among the following equation is incorrect 1. Density = Mass × Volume 2. Mass = Density / Volume 3. Volume = Density / Mass
4. Which among the following statement is correct 1. When an object travels from one place to another, it will reach slower if it travels along the straight-line path. The straight-line path is the longest distance between two points. 2. The total length of a path taken by an object to reach one place from the other is called distance.
5. Which among the following statement is incorrect 1. We can classify speed into two types. If a body in motion covers equal distances in equal intervals of time, then the body is said to be in uniform speed. 2. If a body covers unequal distances in equal intervals of time, the body is said to be in nonuniform speed. Average speed = time taken to travel the distance/ total distance travelled.
6. A car at rest starts to travel in a straight path. It reaches a velocity of 12 m/s in 4 s . What is its acceleration. Assuming that it accelerates uniformly?
7. __________ is the first scientist who used the term element.
8. statement 1: Mercury is solid in room temperature statement 2: Mercury is a non-metal
9. Statement 1: Hydrogen is an element. Statement 2:Hydrogen cannot be broken down into anything simpler
10. Assertion : The number of protons and neutrons is atomic number. Reason : The mass number is sum of protons and neutrons.
11. The average diameter of an atom is ________
12. J.J. Thomson proposed than an atom consists of positively charged sphere in which the electrons are embedded.
13. Assertion : Pollination and fertilization in flowers, produces fruits and seeds. Reasoning :After fertilization the ovary becomes fruit and ovule becomes seed.
14. Assertion : The example of conical root is carrot. Reasoning : It is an adventitious root modification.
15. Assertion : In Banyan prop roots grow horizontally from the tree. Reason : They give additional support to the tree.
16. Assertion (A): Chicken pox is a viral communicable disease. Reason (R) : Characterized by rashes on the whole body, fever, head ache and tiredness.
17. Anorexia means _______
18. Assertion (A) : We must offer first aid to a bleeding person. Reason (R) : We must not use gloves while helping them.
19. A clinical thermometer is calibrated from to ………………..
20. The glass of a clinical thermometer will burst due to excessive pressure created by contraction of mercury.
21. Assertion (A): Heat energy is transferred from one body to another due to a temperature difference between them. Reason (R): Heating a substance causes a rise in temperature.
22. Small amounts of electrical current are measured in milliampere (mA). How many milliampere are there in 0.25 A ?
23. Assertion (A) : Insulators do not allow the flow of current through themselves. Reason (R) : They have no free charge carriers.
24. Which one of the following phenomenon occurs when two naked wires of electricity supply line touch other?
25. A bean plant collecting sunlight and turning it into bean seeds is an example of physical and non-periodic change.
26. If the chemical properties of a substance remain unchanged and the appearance or shape of a substance changes it is called a periodic change.
27. Assertion (A) : The formation of iron oxide from iron is a chemical change. Reason (R) : For the rust to form from iron, it must be exposed to air and water.
28. Assertion (A) :Majority of cells cannot be seen directly with naked eye because. Reason (R) :Cells are microscopic.
29. The________ plays a role in change of colour and taste of fruits.
30. Assertion (A) : Stem cells can form different types of cells. Reason (R) : They are found in plants and animals.
31. Approximately species of living organisms found in the earth…………….
32. The binomial name of pigeon is………….
33. Assertion (A) : Identification, assortment and grouping are essential for classification. Reason (R) : These are basic steps of taxonomy.
34.Sorter’s Disease is otherwise known as __________
35. A drug effective in the treatment of pneumonia, and bronchitis, is ______
36. World ORS Day is ______
37. Which of the following conditions is not necessary for combustion?
38. ______ are substances applied to the exterior of a body that kill microbes.
39. The lining of our stomach with a pH of 4 to 6 is designed as such to withstand a high acidic environment.
40. A synthetic fibre which has similar properties to wool is ________
41. Degradable plastics break down into tiny pieces called microplastics.
42. Assertion (A) : It takes a very long time for nylon clothes to breakdown into microfibers but cotton clothes need only six months to decompose. Reason (R) : Nylon made out of petrochemicals is non-biodegradable and cotton cloth is biodegradable.
43. If the Moon is appeaing in the sky today near the star Karthikai, the position of the Moon after 27 days is near the Star
44. ______ surface reflects the light well
45. Choose the translucent substance from the following:
46. The Moon takes ________ days to complete one revolution around the Earth.
47. The galaxy containing young and hot stars is
48. Analgesics are the substances that lower the temperature during fever.
49. Antacids are actually ………………
50. All combustion reactions are ………….
