Cantonment Public School & College, Saidpur Home Test-1
Class:X Subject: Physics Creative Question
Time: 2hours 35 mins Full Marks:50
[Answer any 5 questions]
1.4C and -1C charges are kept 1m separated from each other.
(a) What is charge? 1
(b) Why does metal chain hang from a petrol carrier truck? 2 (c) Find out the attracting force among the two charges. 3 (d) Where zero electric field intensity will be found among the two charges –Explain it
mathematically. 4
2. Look at the figure given bellow and answer the questions.
The work done to carry +5C charge from the infinity to the electric field of “A” and “B”are 200J and 300J respectively.
(a) Write down the Coulomb’s law. 1
(b) A bulb is marked by 220V-60W.Explain it. 2
(c) Find out the electric potential 5m away from the object “A”. 3 (d) If “A”and “B”are connected by a wire then find out the direction of electron following.4 3. Look at the figure given bellow and answer the questions.
(a) What is latent heat? 1
(b) Convert 1KWh into the joule. 2
(c) Find out the equivalent resistance for the above circuit. 3 (d) Without changing the resistance how does assign the resistors in the circuit the current following
will 2A-Explain it. 4
3
3
3
9V I
Fuse d = 10 m
400 C 200 C
A B
4.
Look at the figure given bellow and answer the questions.
1. What is pressure? 1
2. Why don’t we feel any pressure at the atmosphere? Explain. 2 3. To keep the 70kg object on the piston of B how much force should be applied on the piston A?3 4. Is there any change in applied force in piston “B”than that the applied force in piston “A”?
Analyze it mathematically. 4
5. A object of 5kg mass was thrown vertically upward. At the maximum height the total energy of the object is 6002.5J.
(a) What is efficiency? 1
(b) What do you mean by 40J work done? 2
(c) At which velocity the object was thrown? 3
(d) According to the mathematical explanation find out the kinetic and potential energy at 32.5m
height and hence show that the total energy is constant. 4
6. 100gm water of 200 C is mixed with the 200gm boiled water. The specific heat of water is 4200Jkg-1K-1 and the latent specific heat of melting ice is 336000Jkg-1 .
(a) What is specific resistance? 1
(b) Why the work done is not always equal by the equal application of force? 2
(c) Find out the temperature of the mixture. 3
(d) How much ice will not be melt if 300gm ice is added in that mixture? Explain it mathematically.4 7.
Look at the figure given bellow and answer the questions.
Here R1 = 100 , R2 = R3 = 50 , R4 = 75 and E = 6 V
(a) What is ice point? 1
(b) What do you mean by the emf of a cell is 6V?Explain. 2
(c) Determine the equivalent resistance of the circuit. 3
(d) How much current will be followed in every resistance of the circuit? Explain it mathematically.4 8. Two engines of 10KW and 5.88KW are used to pick up 200kg and 1000kg of water respectively in 1 minute to the roof of a building of 30m height.
(a) What is watt? 1
(b) What do you mean by the potential energy of a body is 50J? 2
(c) What is the effective capacity of the first engine? 3
(d) Which engine is more efficient –explain it mathematically. 4
R1
+ –
R4
R2 R3
E
B wc÷b
A
Cantonment Public School & College, Saidpur Home Test-1
Class:X Subject: Physics Objective Question
Time: 25 mins Full Marks:25
1. What is the magnitude of Coulomb’s constant
“k” in the vacuum?
(a) 9 109 Nm2C–2 (b) 9 109 Nm2C2 (c) 9 109 Nm–2C–2 (d) 9 109 Nm–2C2 2. What is the unit of electric potential?
(a) JC–1 (b) NC–1 (c) JC (d) J–
1C
Observe the figure given bellow and answer to the question no.3and 4
“A” is an object which is charged with the +ve charges. A charge +q is placed at the point P. An electric field is produced at the point P due to the charged object “A”.
3. If the exerted force on the particle is F which is placed at the point P then the valid relation with the electric field E is-
(a) F= qE (b) E = qF (c) E = F2
q (d) E = dF
4. If the position of the point P is shifted to the point C then what will be occur?
(a) Electric field will be decreased (b) Electric field will be increased
(c) Force will be decreased (d) amount of charge will be decreased
5. Who has given the concept of electric lines of force?
(a) Coulomb (b)
Farad
(c) Newton (d)
Einstein
6. Which is the correct relation?
(a) R L2 (b) R2
L
(c) R L (d) R
1 L
7. Which is the relation of specific resistance?
(a) (b) m (c) m (d) (
m)–1
Read out the stem given bellow and give the answer ques. No. 8 & 9
In a house everyday a light of 60W is switched on for 5 hours, a fan of 75 W is moving for 6 hours and a television of 65W is switched on for 2 hours. The cost of current bill is 3tk/unit.
8. What is the total spent of electric power?
(a) 88 kWh (b) 0.88 kWh
(c) 880 kWh (d) 8.8 kWh
9. What is the amount of current bill in a day?
(a) 264tk (b) 2.64tk (c) 2640tk (d) 26.4tk
10. What is the unit of electric power?
i. kWh ii. BOT iii. unit
Which is correct?
(a) i and ii (b) i and iii (c) ii and iii (d) i, ii and iii
11.
In the above figure what is the value of Rp?
(a) 2R (b) 3R (c) R
2 (d) R 3 12. What is the dimension of power?
(a) [ML2T–2] (b) [ML3T–3] (c) [MLT–3] (d) [ML2T–3] 13. A boy of 40kg can climb 15stairs of 20cm height in 15 seconds. What is the applied power of the boy?
(a) 178.4 W (b) 178.4 J m–1
(c) 78.4 W (d) 3 106 W
14. The spring constant of a spring is k. The spring is compressed by x distance from the equilibrium then the stored energy of the spring is-
(a) kx2 (b) –kx2 (c) 1
2 kx2 (d) 1 2 kx2
R R R
A
+q C
d P
15. Who has given the theory of relativity?
(a) Coulomb (b)
Farad
(c) Newton (d)
Einstein
16. Kinetic energy can be increased of a body by-
i.Increasing height ii.Increasing velocity
iii. Increasing mass of the object Which is correct?
(a) i and ii (b) i and iii (c) ii and iii (d) i, ii and iii
17. What is the relation between stress and strain?
i.stress strain ii.
= constant iii. stress
Which is correct?
(a) i and ii (b) i and iii (c) ii and iii (d) i, ii and iii
18. What is the unit of stress?
(a) N m–1 (b) N m–2 (c) N m1 (d) N
m2
19. What is the 4th state of matter?
(a) Gas (b) Plasma (c) Solid (d) Liquid
20. If the weight and buoyancy of a substance is equal then what will be happened?
(a) Completely floating
(b) The object will float partially immersed in liquid
(c) The object will sink in the liquid
(d) The object will float in the liquid completely submerged
21.Which relation is not correct?
(a) = 2 (b) = 3 (c) = 2 (d)
= 3
22.What is the temperature of the triple point of water?
(a) 0 K (b) 1
273 (c) 25 K (d) 273 K
23. A piece of 100gm ice is dropped into the 1L water at 30o C.After melting the whole ice what will be the final temperature of the water?
(a) 10C (b) 20C (c) 30C (d) 40C
24. What is the unit of the specific heat?
(a) J K–1 (b) J kg–1 K–1 (c) J s–1 (d) J kg–1
25. The correct correlation between temperature scales is-
i. TC
5 = TF – 32 9 ii. TK – 273
5 = TC
100 iii. TK – 273 = TC Which is correct?
(a) i and ii (b) i and iii (c) ii and iii (d) i, ii and iii
