## Physics Past Paper 10th Class 2017 Karachi Board

# PHYSICS 2017

## Time: 30 Minutes Max. Marks: 17

## SECTION “A” (MULTIPLE CHOICE QUESTIONS)

** 1. Choose the correct answer for each from the given options.**

1.A micrometer is equal to:

- 10^-6 m
- 10^-9 m
- 10^10 m
- 10^12 m

2.The freely falling bodies value of ‘g’ is

- 4.9 m/s^2
- 9.8 m/s^2
- 19.6 m/s^2
- 39.2 m/s^2

3. Refractive index of glass is:

- 1.52
- 1.33
- 2.42
- 1.64

4. Kg. m/s2 is the unit of:

- Power
- weight
- Pressure
- Momentum

5.Boiling point of pure water is:

- 0k
- 273 k
- 373 k
- 227 k

6. One horsepower is equal to:

- 450 watt
- 7 46 watt
- 550 watt
- 476 watt

7.The radius of curvature of a concave mirror is 20 cm its focal length will be:

- 40cm
- 40cm
- 10cm
- 10cm

8. In nuclear reactor control rods are of:

- Carbon
- Boron
- Aluminum
- Sodium

9. The value of ‘G’ was determined experimentally by

- Newton
- Cavendish
- Galileo
- Pascal1

10. N-Type material is formed when semiconductor is doped with element:

- Divalent
- Trivalent
- Tetravalent
- Pentavalent

11. Raindrops are spherical in shape because of this property of water:

- Density
- Viscosity
- Pressure
- Surface tension

12. Loudness of sound depends upon

- Amplitude
- Frequency
- Wavelength
- Velocity

13. Kitabul Manazir is written by:

- AI-Baruni
- Yaqoob AI-Kindi
- lbn-ul-Haitham
- Moosa AI-Khwarzami

14.It is not a vector quantity:

- Momentum
- Weight
- Pressure
- Torque

15.The mechanical advantage of a movable pulley is:

- 2
- 3
- 4
- 5

16.Kilo-watt hour is the commercial unit of:

- Power
- Electrical Energy
- Time
- Velocity

17. The lightest particle in an atom is;

- Neutron
- Electron
- Deuteron
- Proton

##

## Physics Past Paper 10th Class 2017 Karachi Board

## SECTION “B” (SHORT-ANSWER QUESTIONS)(42)

** NOTE: Answer 14 questions from this section.**

2. Define Physics and write the names of any of its four branches.

3. Write down the S.I. units of the following physical quantities: (i) Time (ii) Weight (iii) Power (iv) Stress (v) length (vi) Frequency

4. State Newton’s laws of motion

5. A car starting from rest attains a velocity of 20 ms·1 in 5 seconds. Find the distance covered by the car.

6. Define wavelength, time period and frequency.

7. Write three states of equilibrium.

8. Define: (i) Nuclear Fission (ii) Rectifier (iii) Half-life of an element

9. A steel rod has a length of 10 meters at a temperature of 25°C. Calculate the increase in length if it is heated to 35°C, For Steel (a.= 1.1 x 10·5 K”1)

10. Write Newton’s corpuscular theory of light.

11. A car is moving in a circular track of radius 30 m at a constant speed of 20 m/s. Find the centripetal acceleration of the car.

12. Define Primary cell and write its four examples.

13. Find the resistance of an electric bulb if 0.60 A current is passing through it and the potential difference across the bulb is 90V.

14. Define pressure. Write its formula and S.I. unit.

15. What is Bimetallic Strip? Write the names of its two applications.

16. What is the Kinetic Energy (K.E) of 2000 Kg car traveling at a velocity of 90 km/h?

17. State the laws (i) Charle’s law (ii) Coulomb’s law (iii) Ohm’s law.

18. With the help of diagram define negative of a vector and resultant vector.

19. Write down three differences between forward biased and reverse biased..

20. Calculate the distance of the object from a convex lens having a focal length of 15 cm if the magnification in 3 and the image in real.

21. Calculate the length of second’s pendulum -Taking ‘g, equl to 10 m/s^2 (second ‘s pendulum has a time period of 2 seconds)

22. In a nuclear reactor,n 9.0 x 10^10J of energy is released due to a conversion of mass into energy. How much mass has been converted to energy.

##

## Physics Past Paper 10th Class 2017 Karachi Board

## SECTION ‘C’ (DETAILED ANSWER QUESTIONS}

** Note: Answer any Two questions from this Section**

23.(a) Derive the equation : S = Vit + 1/2 at^2

(b) What is the inclined plane? Calculate its Mechanical Advantage

(c) Write four properties of Alpha rays.

24.(a) Write the construction and working of an electric bell with the diagram.

(b) What is Radar? Write its three uses

( c) Write four uses of spherical mirrors.

25. (a) Two bodies of different masses are attached with a string which passes over a frictionless pulley such that the bodies are moving vertically. Derive the formula: a=(m1-m2/m1+m2)g

(b ) . Draw a ray diagram of an Astronomical Telescope and describe to working

(c ) Define Musical sound and write its three characteristics.