Q 1. Which of the following statement is correct regarding velocity and speed of a moving body?
(a) Velocity of a moving body is always higher than its speed
(b) Speed of a moving body is always higher than its velocity
(c) Speed of a moving body is its velocity in a given direction
(d) Velocity of a moving body is its speed in a given direction
(d) Velocity of a moving body is its speed in a given direction
Q 2. For a body performing motion with uniform speed, the distance-time graph is:
(a) Straight line parallel to y-axis
(b) Straight line inclined to the time axis
(c) Straight line parallel to x-axis
(d) Curved line
(d) Curved line
Q 3. The state of matter which consists of super energetic particles in the form of ionized gases is called:
(a) Gaseous state
(b) Liquid state
(c) Bose- Einstein condensate
(d) Plasma state
(d) Plasma state
Q 4. An object travels 20 m in 5 sec and then another 40 m in 5 sec. What is the average speed of the object?
(a) 6 m/s
(b) 2 m/s
(c) 12 m/s
(d) 0 m/s
(a) 6 m/s
Q 5. A plant cell becomes turgid due to
(a) Plasmolysis
(b) Exosmosis
(c) Endosmosis
(d) Electrolysis
(c) Endosmosis
Q 6. Which of the following statements is incorrect about the state of matter?
(a) The force of attraction between the gas particles is very less.
(b) Plasma consists of super energetic and super excited particles.
(c) The plasma glows with a special colour depending on the nature of the gas.
(d) Bose-Einstein condensate is formed by heating gas of extremely low density
(d) Bose-Einstein condensate is formed by heating gas of extremely low density
Q 7. Which of the following is not a property of gas?
(a) Gases have a definite shape
(b) Gases have no definite volume
(c) The rate of diffusion of a gas is higher
(d) Gaseous particles are in a state of random motion
(c) The rate of diffusion of a gas is higher
Q 8. What term is used to describe the phase change of a solid to a liquid?
(a) Freezing
(b) Melting
(c) Boiling
(d) none of them
(b) Melting
Q 9. If you leave water in a glass and some molecules turn into a gas, it is called:
(a) Condensation
b) Evaporation
(c) Extinction
d) Sublimation
b) Evaporation
Q 10. The cell wall of a plant cell is made up of:
(a) glucose
(b) fructose
(c) protein
(d) cellulose
(d) cellulose
Q 11. Fill in the blanks:
- Every cell is surrounded by a ________
- In prokaryotes, the nuclear membrane is ________.
- The _________ consists of stacks of membranes bound vesicles that function in the storage and packaging.
- Gametes of reproductive organs are formed by cell division called _______.
Q 12. Which cell organelle controls most of the activities of the cell?
Cell
- Cells are the basic functional unit of all living organisms.
- They provide structural support and carry out functions required to sustain the life of the organism.
- Cells are made up of cell organelles.
- Some cell organelles are the nucleus, mitochondria, ribosomes, endoplasmic reticulum, etc.
- Each organelle performs different functions in the cell.
Nucleus:
- The nucleus is the most important organelle of the cell which controls all the cellular activity.
- It contains the genetic material in the form of DNA which is protected by the nuclear envelope.
- It contains all the information required for the proper functioning of the cell.
- It controls cellular activity by regulating protein and enzyme synthesis.
Q 13. Describe the microscopic structure of the cell.
A cell is the structural and functional unit of life. It was discovered by Robert Brown in 1669. A cell has several compartments and these compartments are called cellular organelles.
Q 14. What is membrane biogenesis? How is plasma membrane formed during this process?
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Q 15. When a crystal of potassium permanganate is placed in a beaker containing water, its purple colour spreads throughout the water. What do you conclude from this observation about the nature of potassium permanganate and water?
Q 16. Why does the temperature of a substance remain constant during its melting point or boiling point?
Q 17. A bus decreases its speed from 80 kmh-1 in 5 seconds. Find its acceleration and retardation.
Q 18. A body starts to slide over a horizontal surface with an initial velocity of 0.5 m/s. Due to friction, its velocity decreases at the rate 0.05 m/s2. How much time will it take for the body to stop?
Q 19. Four cars A, B, C and D are moving on a levelled road. Their distance versus time graphs are shown in figure. Which car is the slowest?
Q 20. Define uniform circular motion. Is it a case of accelerated motion or non-accelerated motion.
Q 21. A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km h. Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km h. Find the magnitude of average velocity, and average speed of the man over the interval of time
(i) 0 to 30 min
(ii) 0 to 50 min
(iii) 0 to 40 min
Q 22. A train covers half of its journey with a speed of 30ms-1 and the order half with a speed of 40 ms-1 . Calculate the average speed of the train during whole journey.
Q 23. A boy moves along the edge of a square park of side 40 m and stops at the diagonally opposite end of it. Find his velocity and speed if he takes 0.5 minutes to reach there.