PHY101

1. A Null vector is a vector whose magnitude is __________.

2. What is the unit of impulse?

3. Instantaneous velocity is the velocity of a particle at some _____of its path.

4.  Tin melts at 232 under standard atmospheric pressure. Express this temperature in kelvin

5. When an object is in thermal equilibrium, it is losing and gaining heat at ____ rates.

6. A piece of stone has mass 80kg and density of 0.10 kg per meter cube. What is its volume in meter cube?

7. A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is NOT true?

8.  The resultant of vectors $vec{A}$ and $vec{B}$ has a magnitude of 20 units.$vec{A}$ has a magnitude of 8 units, and the angle between $vec{A}$ and $vec{B}$ is $40^{o}$. Calculate the magnitude of $vec{B}$

9.  The speed of 90 hm/hr is equal to ------------------ m/s

10.  The absolute zero temperature refers to the temperature at which _____

11.  A stone thrown from ground level returns to the same level 4 s after. With what speed was the stone thrown? Take $g = 10ms^{-2}$

12. Gases occupy volume of the __________.

13. The term that best describes the need to hold the butt of a riffle firmly against the shoulder when firing to minimise impact on the shoulder is ________

14. Calculate the root-mean-square velocity of oxygen molecules at room temperature, 25 oC. Given that molar mass of oxygen and molar gas constant are 31.9998 g/mol and 8.3143 J/mol K, respectively in meter per second.

15. A mass accelerates uniformly when the resultant force acting on it

16. A _______ consists of two equal and opposite parallel forces.

17.  A boy intends to move an m-kg crate across the floor by applying a constant force P newtons on it.The coeficient of friction between the floor and the crate is $mu$. Which of these is the best option for his task?

18. The physical pendulum is any real pendulum in which all the mass is taken to be concentrated at a_____.

19. Forces are called coplanar when all of them acting on body lie in one _____.

20. When trying to turn a key into a lock, ____ of forces are applied.

21. One of these is NOT a basic assumption of kinetic theory of ideal gases

22.  Which of the following is NOT true?

23.  The trajectory of a projectile is ________

24. Which of the following substances has the highest viscosity at room temperature?

25. The fundamental interval of a thermometric scale is ______

26. The general motion of a rigid body is a combination of ________and rotation.

27.  A body hangs from a spring balance supported from the roof of an elavator. If the elavator has an upward acceleration of $3ms^{-2}$ and the balance reads 50 N, what is the true weight of the body?

28. What is common to the variation in the range and the height of a projectile?

29. Thermal expansion of a solid material depends on the following EXCEPT __________

30. The main condition for the rigid body is that the distance between various particles of the body does not ____.

31. On what thermometric property does the working of a thermistor depend?

32. One of these is an example of thermal radiation detector

33. If a force of 40N acting in the direction due East and a force of 30N is acting in the direction due North. Then the magnitude of the resultant forces will be ___________.

34. The heat required to raise the temperature of the body through 1K is called _______.

35. An object is thrown upward from the edge of a tall building with a velocity of 10 m/s. Where will the object be 3 s after it is thrown? Take $g = 10ms^{-2}$

36. The specific latent heat of vapourization of a liquid is the quantity of heat in joules required to change 1kg mass of the liquid at its _______to gas at the same temperature.

37.  An ungraduated mercury thermometer attached to a millimeter scale reads 22.8mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is 20^{o} C?

38. _______ is that which enables a body to perform work.

39. Applied force is proportional to extension produced is a statement of ____ law.

40. The _______ occurs when the driving frequency is the same as the natural frequency of the oscillator.

41. The _________ is an aggregate of point masses such as that the relative separation between any two points remains invariant

42. Given that the specific capacity of ice is one-half that of water, does is take more thermal energy to raise the temperature of 5 g of water or 5 g of ice by $$6^{o}C?$$

43. Which of the following does NOT refer to the terms description of stability of on an object?

44. The coefficient of limiting static friction is the ratio of the ____ to the normal force.

45.  In which of the following phenomena is surface tension important?

46. A perfectly ____ body is defined as one which emits every wavelength with the maximum energy for each wavelength for the particular temperature of the body.

47.  A 50kg boy suspends himself from a point on a rope tied horizontally between two vertical poles. The two segments of the rope are then inclined at angles 30 degrees and 60 degrees respectively to the horizontal.The tensions in the segments of the rope in newtons are ______

48.  Which of the following contributes to the instability of an object?

49. According to the kinetic-molecular theory, particles of matter are in motion in both gas and _____.

50.  The amount of heat stored in a substance depends on all of the following EXCEPT _______