Measurement of a Curved Line

Q.

Sound waves whose frequency is greater than 20000 Hz is called ___.

1. infrasonic sound

2. ultrasonic sound

3. supersonic sound

4. sonic boom

Q.

Area is a ______ physical quantity.

Q.

A boy measures the length of a pencil and expresses it to be 2.6cm. What is the accuracy of measurement? Can he write it as 2.60cm.

Q.

A box is at rest on a smooth surface. Two friends are pushing it in opposite directions as shown below. Choose the correct option.

1. Net force is zero.
2. Net force is $3N$ in the right direction.
3. Net force is $3N$ in the left direction.
4. Net force is $17N$ in the left direction.

Q.

A Student Measured The Length Of A Rod And Wrote It As $3.50Cm$. Which Instrument Did He Use To Measure It?

Q.

Which of the following objects/methods should we use to make the measurement of this object?

1. Pieces of marbles whose length is known

2. It is impossible to measure the length of a curved line

3. A thread of known length

4. Meter scale

Q.

Area is always measured in

1. given units

2. $cm$

3. $m$

4. $\mathrm{sq}.\mathrm{units}$

Q. A boy makes a ruler with graduation in centimetre on it .To what accuracy is ruler can measured? How can this accuracy be increased?

Q. State two precautions to be observed while measuring length with the help of a metre scale.

Q.

Which of the following can be used together to measure the length of a zig-zag path?

1. A string

2. Thermometer

3. A metre scale

4. A wooden ruler

Q. The girth of a tree trunk can be measured by using a ___________.

1. plastic ruler
2. metre scale
3. metre rod
4. measuring tape

Q. Which among the following is a converging mirror?

1. Plane mirror
2. Convex mirror
3. Concave mirror
4. Plano-convex mirror

Q. Length is a physical quantity.

1. True
2. False

Q.

Suppose you had to make some measurement and the only scale you had broke off. Think whether while using a meter/centimeter scale, it is okay to take measurements from some mark other than zero.

1. True
2. False

Q. Which of the following frequencies of sound elephants produce ?

1. ultrasonic
2. infrasonic
3. cant say
4. both A & B

Q.

If equal distances are travelled by equal interval of time the motion is said to be

1. Uniform

2. Non uniform

3. Periodic

4. Oscillatory

Q. The frequencies below 20 Hz are known as__________sounds.

Q.

Which of the following can be used to measure the length of a curved line?

1. Non-stretchable string

2. Metre scale

3. Wooden ruler

4. Calipers

Q. helps us to put values for various quantities such as length, mass, temperature and many more.

1. Measurement
2. Science
3. Intuition

Q. While measuring length using a metre scale, the position of the eye does not affect the measurement. True or false?

Q. Sound above which frequency is called ultrasonic?

Q. Which of the following can be used to measure the length of a curved path?

1. String
2. Odometer
3. Barometer
4. Weighing scale

Q. Virat is given the task of measuring a rigid curved steel rod as shown in the figure.
Which of the following objects should he use for getting the most accurate measurement?

1. Only a metre scale
2. A straight rod of known length
3. Both a metre scale and a thread
4. Only a thread

Q. Virat is given the task of measuring a rigid curved steel rod as shown in the figure.
Which of the following objects should he use for getting the most accurate measurement?

1. Only a metre scale
2. A straight rod of known length
3. Both a metre scale and a thread
4. Only a thread

Q. Virat is given the task of measuring a rigid curved steel rod as shown in the figure.
Which of the following objects should he use for getting the most accurate measurement?

1. Only a metre scale
2. A straight rod of known length
3. Both a metre scale and a thread
4. Only a thread

Q. A curved trace or line is measured with the help of :

1. Ruler only
2. Metre rod only
3. Thread only
4. Thread and ruler