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)