The diagram below illustrates trapped air in a syringe placed in water that is gradually heated. It is observed that the piston rises as the temperature of the water rises. Which of the following statements explains this observation?

• A. frequency of collision of trapped air molecules with walls of the syringe is more
• B. molecules of trapped air expands more
• C. speed of the trapped air molecules decreases
• D. number of molecules of trapped air increases

A certain radioactive source emits radiation that was found to be deflected by both magnetic and electric fields. The radiation is?

• A. beta rays
• B. gamma rays
• C. x-rays
• D. ultra-violet rays

Calculate the quantity of heat needed to change the temperature of 60g of ice at 0 °C to 80 °C. [specific latent heat of fusion of ice= 3.36 x 10\(^5\) Jkg\(^{-1}\) specific heat capacity of water 4.2 x 10\(^3\) J kg\(^{-1}\) K\(^{-1}\)]

• A. 4.80 kJ
• B. 20.16 kJ
• C. 40.32 kJ
• D. 22.17 kJ

Which of the following is a fundamental quantity?

• A. speed
• B. density
• C. lenght
• D. impulse

200g of water at 90°C is mixed with 100g of water at 30°C. What is the final temperature?

• A. 50^oC
• B. 60^oC
• C. 70^oC
• D. 80^oC

An image in a convex lens is upright and magnified 3 times. If the focal length of the lens is 15 cm, what is the object distance?

• A) 10 cm
• B) 25 cm
• C) 16 cm
• D) 14 cm

In a closed organ pipe producing a musical note, an antinode will always be produced at

• A. the closed end
• B. the open end
• C. the middle
• D. all the parts of the pipe

If the angle between two vector P and Q is O^o, the vectors are said to

• A. intersect at the angle 45^o
• B. intersect at the angle 60^o
• C. be parallel
• D. be perpendicular

the pressure of 3 moles of an ideal gas at a temperature of 27°C having a volume of 10^-3m³ is

• A. 2.49 x 10⁵Nm^-2
• B. 7.47 x 10⁵Nm^-2
• C. 2.49 x 10⁶Nm^-2
• D. 7.47 x 10⁶Nm^-2

A relative density bottle has a mass of 19 g when empty. When it is completely filled with water, its mass is 66 g. What will be its mass if completely filled with alcohol of relative density 0.8?

• A. 47 g
• B. 52.8 g
• C. 37.6 g
• D. 56.6 g