## 5 Mar 2017

### 9th Physics Full Paper

9th:         Physics                                                                 Time:15 Mins
Marks: 12
OBJECTIVE TYPE

Q. No.1:          Choose the right answer.                                                                               (12x1=12)

 i.  Which of the following is not a derived quantity? a. Length b. Electric current c. Time d. Speed ii. Ampere is SI unit of: a. Length b. Electric current c. Time d. Speed iii. 1hp = ? a. 674 W b. 764 W c. 746 W d. 647 W iv. A car starts from rest. It acquires a speed of 25ms-1after 20s. The distance moved by the car during this time is: a. 31.25 m b. 250 m c. 500 m d. 5000 m v. SI unit of “g” is: a. ms-1 b. kgms-1 c. ms-2 d. kgm2s-2 vi. Mass of the body is measured by: a. Spring balance b. Screw gauge c. Electronic balance d. Meter rule vii. On Kelvin scale, freezing point of ice is: a. 0K b. 32K c. 273K d. 373K viii. Fs = ? a. mg b. R c. Kg d. ix. Metals are good conductor of heat due to: a. Free electrons b. Big size of their molecules c. Small size of their molecules d. Rapid variations of their atoms x. Rooms are heated using gas heaters by: a. Conduction only b. Convection & radiation c. Radiation only d. Convention only xi.  Which of the following is unit of momentum? a. Nm b. Ns c. kgm-1 d. Both b & c xii. If the velocity of a body moving in a circle is doubled then required centripetal force will become: a. Double b. Half c. Four times d. One third

SUBJECTIVE TYPE

9th: Physics                                                         Time:1 Hrs 45 Mins
Marks: 48

Q. No.2:          Give answers of the following.                       (Any five)                                            (5x2=10)
 i. Define variable speed with graph. ii. Define significant figure with an example. iii. Differentiate between circular and rotator motion. iv. Differentiate between base and derived units with an example of each. v. Speed of sprinter is 8.33ms-1. Find time taken to cover 100m. vi. Convert 72kmh-1 into ms-1. vii. Can a body moving with constant speed have acceleration? Justify your answer with proper reasoning. viii. Define Graph.
Q. No.3:          Give answers of the following.                       (Any Five)                                           (5x2=10)
 i. Define pitch of screw gauge. Write its formula and value. ii. Differentiate speed and velocity. iii. Define centripetal acceleration. Write its formula an unit. iv. State second condition of equilibrium. v. Define watt. vi. Write use of solar cell. vii. Describe Einstein mass energy equation. viii. A force of 10N is making an angle of 300 with the horizontal. Find Horizontal component of force. ix. Why the height of racing car is kept low?
Q. No.4:          Give answers of the following.                       (Any five)                                            (5x2=10)
 i. Calculate density of 5 liter of water having mass 5kg. ii. Define pressure and its SI unit. iii. What are thermal climbers? iv. State principle of floatation. v. Write uses of bimetallic strip. vi. Write effect of surface area on the rate of evaporation. vii. Convert 100 0F into 0C. viii. What is meant by Anomulas expansion of water.
Note: Attempt any 2 Questions:                                                                (9x 2 = 18)
Q. 5:    (a).       Define rest and motion and explain them as relative quantities.                                           (05)
(b).       A train starts from rest. It moves through 1km 10 100s with uniform acceleration. What will be its speed at the end of 100s?                                                                                                       (04)
Q. 6:    (a).       State and explain second law of motion.                                                                                (05)
(b).       The starring of a car has radius 16cm. find torques produced by a couple of 50N.                        (04)
Q. 7:    (a).       Resolve a force into its rectangular components.                                                                 (05)

(b).       A force acting on a body of mass 5kg produces on acceleration of 10ms-2. What acceleration the same force will produce in a body of mass 8kg?                                                                   (04)