MCQ
Deepa is measuring the length of her pencil using a scale where the zero mark is broken. She aligns the tip of the pencil with the 2.0 cm mark and finds the other end at the 14.5 cm mark. What is the actual length of the pencil?
A) 14.5 cm
B) 16.5 cm
C) 12.5 cm
D) 10.5 cm
C) 12.5 cm
1. Assertion (A): Body parts like handspans or foot lengths are not used as standard units of measurement today.
Reason (R): The size of body parts differs from person to person, leading to inconsistent measurements.
(a) Both A and R are true and R is the correct explanation of A.
If you are using a scale to measure a pencil and the 1.0 cm mark is your starting point, and the other end is at 10.4 cm, what is the actual length?
The length is 10.4 cm – 1.0 cm = 9.4 cm.
What is the standard International System of Units (SI) unit for length and its official symbol?
The SI unit of length is the metre, and its symbol is written as m.
Anish is watching a Republic Day parade. He notices the soldiers marching in a straight line along the road. This is an example of which type of motion?
◦ A) Circular motion
◦ B) Linear motion
◦ C) Oscillatory motion
◦ D) Periodic motion
B) Linear Motion
Assertion (A): A passenger sitting in a moving bus is at rest with respect to a fellow passenger but in motion with respect to a building outside.
Reason (R): Motion and rest are relative terms and depend entirely on the chosen reference point.
Both A and R are true and R is the correct explanation of A.
A thin metal strip is pressed at one end to a table and the free end is flicked. What type of motion is observed?
oscillatory motion
Why are body parts like handspans or foot lengths not suitable for use as standard units of measurement?
Body parts are not used as standard units because their sizes differ from person to person, leading to inconsistent results.
Tasneem wants to measure the girth (circumference) of a tree in the school garden. Which of the following tools should she use for the most accurate and convenient measurement?
◦ A) A 15-cm plastic scale
◦ B) A metal measuring rod
◦ C) A flexible measuring tape
◦ D) A wooden metre scale
C) A flexible measuring tape
Assertion (A): While reading a scale, the eye can be positioned at any angle as long as the markings are visible.
Reason (R): Positioning the eye directly above the point where the measurement is being taken prevents errors caused by viewing from an angle
Assertion is false, but Reason is true
Padma is traveling to Delhi and sees a kilometer stone stating "Delhi 70 km" followed by "Delhi 60 km." Identify the reference point in this scenario.
Delhi
How can you measure the length of a curved line using a straight metre scale and a piece of thread?
You can place a thread along the curved line, mark the length, and then straighten the thread to measure it against a scale.
According to the SI system, what is the correct way to write the symbol for "five metres"?
◦ A) 5 ms
◦ B) 5 M
◦ C) 5 m.
◦ D) 5 m
◦ D) 5 m
Assertion (A): A flexible measuring tape is preferred over a rigid metal rod for measuring the girth of a tree or a person's chest.
Reason (R): Flexible materials can be easily wrapped around curved surfaces, also rigid scales can contact a curved object along its entire length
A is true but R is false
A student measures a wooden block using a scale with a broken zero mark. They align one end at the 3.0 cm mark and the other end at the 12.8 cm mark. What is the actual length of the block?
The actual length is 9.8 cm (
What is the term for a fixed object or point used to describe the position or distance of an object?
The term for a fixed object or point used to describe the position or distance of an object is called reference point.
A ball is rolling down a straight rollercoaster track and then enters a loop. What sequence of motion does the ball undergo?
◦ A) Circular motion followed by linear motion.
◦ B) Linear motion followed by circular motion.
◦ C) Oscillatory motion followed by periodic motion.
◦ D) Periodic motion followed by linear motion.
Spell. Hint: starts with 'P', used a lot in poetry.
B) Linear motion followed by circular motion.
Assertion (A): The motion of an eraser being whirled at the end of a thread is classified as both circular and periodic motion.
Reason (R): The eraser moves along a circular path and repeats its motion after a fixed interval of time.
Both Assertion (A) and Reason (R) are true and R is the correct explanation of A
A child is playing on a swing in a park. Identify the two types of motion the swing is undergoing.
oscillatory motion and periodic motion
What specific type of motion is defined by an object moving to and fro about a fixed position?
When an object moves to and fro about a fixed position, its motion is classified as oscillatory motion.