Practice the AP 9th Class Physical Science Bits with Answers Chapter 12 Units and Graphs on a regular basis so that you can attempt exams with utmost confidence.

## AP State Syllabus 9th Class Physical Science Bits 12th Lesson Units and Graphs with Answers

Question 1.

Units of a physical quantity should be placed

A) before the magnitude

B) after the magnitude

C) above the magnitude

D) below the magnitude

Answer:

B) after the magnitude

Question 2.

Which of the following is not a fundamental quantity ?

A) light intensity

B) length

C) pressure

D) mass

Answer:

C) pressure

Question 3.

Units of temperature in SI system

A) °C

B) Kelvin

C) Calorie

D) A (or) B

Answer:

B) Kelvin

Question 4.

SI system means

A) Standard International Measures

B) State Implement Units

C) International System of Units

D) International Standards of Measurements

Answer:

C) International System of Units

Question 5.

Seconds are the units belongs to

A) CGS system

B) MKS system

C) SI system

D) Above all

Answer:

D) Above all

Question 6.

Match the following.

a) Electricity i) mol

b) Light intensity ii) candela

c) Quantity of substance iii) ampere

A) a – iii, b – ii, c – i

B) a – i, b – ii, c – iii

C) a – i, b – iii, c – ii

D) a – ii, b – iii, c – i

Answer:

A) a – iii, b – ii, c – i

Question 7.

In the derivation of units of pressure which of the following base units are used ?

a) meter

b) kilogram

c) second

A) a & c

B) b & c

C) a & b

D) a, b & c

Answer:

D) a, b & c

Question 8.

1 pico meter =

A) 10^{-9} meters

B) 10^{-8} meters

C) 10^{-12} meters

D) 10^{-10} meters

Answer:

C) 10^{-12} meters

Question 9.

Which of the following is incorrect ?

A) 10^{-9} m = 1 nanometer

B) 10^{-6} m = 1 micrometer

C) 10^{-3} m = 1 kilometer

D) None of the above

Answer:

C) 10^{-3} m = 1 kilometer

Question 10.

5 × 10^{-3} km – 0.005 km

In the above data conversion factor is

A) 5

B) 10^{-3}

C) 0.005

D) 5 × 10^{-3}

Answer:

B) 10^{-3}

Question 11.

To convert km/hr into m/s we should multiply m/s with

A) \(\frac{5}{18}\)

B) \(\frac{18}{5}\)

C) \(\frac{9}{5}\)

D) \(\frac{5}{9}\)

Answer:

A) \(\frac{5}{18}\)

Question 12.

Velocity = 10 cm/s. Velocity in SI system is

A) 0.1 m/s

B) 0.01 m/s

C) 1 m/s

D) 10^{3} m/s

Answer:

A) 0.1 m/s

Question 13.

Which of the following is correct presentation of units ?

A) 2 Kg

B) 2kg

C) 2 kg

D) 2 kgs

Answer:

C) 2 kg

Question 14.

Which of the following is not correct?

A) 4 joules

B) 4 j

C) 4 J

D) None

Answer:

B) 4 j

Question 15.

Which of the following is correct ?

A) MW

B) kW

C) Watts

D) K.W

Answer:

A) MW

Question 16.

Pramila calculated oscillations of a pendulum by fixing length of thread at 1 m, 2 m, 3 m, ………………

From the data independent variable is

A) no. of oscillations

B) length

C) time

D) mass of bob

Answer:

B) length

Question 17.

The range of 1, 1.1, 0.5, 1.6, 1.01, 1.5 is

A) 1.1

B) 0.5

C) 1.01

D) 0.1

Answer:

A) 1.1

Question 18.

If the range is 12 and no. of grids on x – axis is 24, then the scale on x – axis is

A) 2

B) 6

C) 0.5

D) 1

Answer:

C) 0.5

Question 19.

Vertical axis and horizontal axis are

A) x – axis, y – axis

B) y – axis, x – axis

C) x – axis, x – axis

D) y – axis, y – axis

Answer:

B) y – axis, x – axis

Question 20.

The graph of velocity and time of a free fall body is

A) curved line graph

B) straight line graph

C) A or B

D) Bar graph

Answer:

B) straight line graph

Question 21.

Slope of s – t graph shows

A) Speed

B) Velocity

C) Acceleration

D) Position

Answer:

B) Velocity

Question 22.

Slope of v – t graph shows

A) Speed

B) Velocity

C) Acceleration

D) Displacement

Answer:

C) Acceleration

Question 23.

Area of v – t graph shows

A) Speed

B) Velocity

C) Acceleration

D) Displacement

Answer:

D) Displacement

Question 24.

Area of a – t graph shows

A) Speed

B) Velocity

C) Position

D) Displacement

Answer:

B) Velocity

Question 25.

The graph of elongation of a spring and mass attached to spring is in the shape of

A) Straight line passing through the origin

B) Straight line parallel to the x – axis

C) Straight line parallel to the y – axis

D) Curved line

Answer:

A) Straight line passing through the origin

Question 26.

F ∝ \(\frac{1}{\mathbf{d}^{2}}\) .The graph of F – d is

A) straight line

B) parabolic

C) irregular

D) A or B

Answer:

B) parabolic

Question 27.

a) y is inversely proportion to x.

b) y is proportional to the square of x.

c) y is proportional to the square root of x.

Match the graphs.

A) a – i, b – ii, c – iii

B) a – ii, b – iii, c – i

C) a – iii, b – i, c – ii

D) a – iii, b – ii, c – i

Answer:

A) a – i, b – ii, c – iii

Question 28.

Area of the graph of force and time is

A) pressure

B) displacement

C) impulse

D) none

Answer:

C) impulse

Question 29.

Graph of Hooke’s law is in the shape of

A) straight line passing through origin

B) straight line parallel to the x – axis

C) straight line parallel to the y – axis

D) curved line

Answer:

A) straight line passing through origin

Question 30.

Latent heat of fusion of ice shows

A) AB

B) BC

C) CD

D) DE

Answer:

B) BC