PHY101

1. 3-vectors are only properly represented in a 3-dimensional _____.

2.  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 ______

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

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

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

6.  A man leaves the garrage in his house and drives to a neighbouring town which is twenty kilometres away from his house on sight-seeing. He returns home to his garrage two hours after. What is his average velocity from home in km/h?

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

8. The _____of oscillations of a particle in simple harmonic motion is damped by resistive forces due to the surrounding medium.

9.  The molecules of a liquid are held together by what type of forces?

10. What is the unit of impulse?

11.  What are the dimensions of power (time rate of change of expending energy)

12. An electric kettle contains 1.5 kg of water at $$100 ^{o}$$ and powered by a 2.0 kW electric element. If the thermostat of the kettle fails to operate, approximately how long will it take for the kettle boil dry? (Take the specific latent heat of vaporization of water as $2000kJkg^{-1}) $

13. 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.

14. The ____ of the instantaneous centre of a moving rigid body is called centroid.

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

16.  A rope suspended from a ceiling supports an object of weight W at its opposite end. Another rope tied to the first at the middle is pulled horizontally with a force of 30N. The junction P of the ropes is in equilibrium. Calculate the weight W and the tension T in the upper part of the first rope

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

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

19. A wall or partition that allows free exchange of heat energy between two systems is referred to as --------------

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

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

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

23. When the junctions of two dissimilar metals are maintained at different temperatures an electromotive force is is set up in the circuit of which these junctions are a part. A pair of junctions of this kind is known as _____________

24. Two forces act on a point object as follows: 100 N at $170^{o}$ and 100N at $50^{o}$. Find the resultant force

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

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

27. 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 ________

28. According to principle of moment, if a system of coplanar forces is in equilibrium, then the algebraic ____of their moments about any point in their plane is zero

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

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

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

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

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

34.  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?

35.  A ball is kicked and flies from point P to Q following a parabolic path in which the highest point reached is T. The acceleration of the ball is _______

36. How fast must a ball be rolled along the surface of a 70-cm high table so that when it rolls off the edge it will strike the floor at the same distance (70cm) from the point directly below the edge of the table?

37. 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.

38. The rise in the level of a liquid in a tube is h. If half the amount is poured outside, what will be the new rise in the liquid level?

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

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

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

42. Radius of _________ is the radial distance from any given axis at which the mass of a body is concentrated without changing the moment of inertia of the body about that axis.

43.  Which of these is correct about viscosity?

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

45. 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 ___________.

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

47. An object is shot from the ground at 75m/s at an angle of 45 degrees above the horizontal. How high does the object get before beginning its descent?

48. The method of mixtures as a means of measuring the amount of heat of a substance depends of the principle of conservation of ______

49. The velocity of a particle moving with simple harmonic motion is ____ at the mean position.

50.  The motion of a ball rolling down a ramp is one with ________