I. Rays of light travel from a less dense medium to a denser medium. II. The Angle of incidence is greater than critical angle. III. Rays of light travel from a denser medium to a less dense medium. Which of the statements above are conditions for total internal reflection to occur?

• A. I & II only
• B. I & III only
• C. II & III only
• D. II only

(a) State the triangle law of vector addition.

(b) Name the four physical quantities that are associated with the equationq of linear motion.

(c) Using the same set of axes, sketch and label two graphs to illustrate the variation of potential energy and kinetic energy with time for a body in simple harmonic motion.

(d)

A light spiral spring of force constant K lies on a horizontal frictionless surface and has one end fixed to a vertical wall. A block P of mass 2.0 kg placed against the free end of the spring is pushed a distance 5 cm towards the wall with 10J of energy as illustrated in the diagram below. The block is released and after 0.25s, it collides inelastically with a stationary block Q of mass 4.0 kg. Calculate the:

(i) value of k;

(ii) force used to compress the spring;

(iii) acceleration of the block p after release;

(iv) common speed after collision of the blocks.

Which of the following conditions are necessary and sufficient for total internal reflection to take place at the boundary between two optical media?

I. Light is passing from optical denser medium to optically less dense medium

II. Light is passing from optically less dense medium to optically denser medium

III. Angle of incidence is greater than a certain critical value

IV. Angle of incidence is lesser than a certain critical value

• A. I and II only
• B. II only III only
• C. III and IV only
• D. I and III only

How much work is done against the gravitational force on a 3.0 kg object when it is carried from the ground floor to the roof of a building, a vertical climb of 240 m?

• A. 7.2 kJ
• B. 4.6 kJ
• C. 6.8 kJ
• D. 8.4 kJ

A man 1.5m tall is standing 3m in front of a pinhole camera whose distance between the hole and the screen is 0.1m. What is the height of the image of the man on the screen?

• A. 0.05m
• B. 0.15m
• C. 0.30m
• D. 1.00m

If an object just begins to slide on a surface inclined at 30º to the horizontal,the coefficient of friction is?

• A. √3
• B. \(\frac{√3}{2}\)
• C. \(\frac{1}{√2}\)
• D. \(\frac{1}{√3}\)

In the diagram given the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static

• A. m1/m2
• B. m1/gm2
• C. m2/m1
• D. m2/gm1

The minimum energy required to remove an electron from an atom is known as

• A. excitation energy
• B. ionization energy
• C. binding energy
• D. photon energy

What will happen to the pressure of a gas if its temperature is reduced to -273^oC?

• A. It will decrease
• B. it will drop to zero
• C. It will increase
• D. It will remain constant

A rectangular metal block of volume 10^-6m³ at 273k is heated to 573k. If its coefficient of linear expansion is 1.2 x 10^-5k^-1, the percentage change of it volume is

• A. 1.5%
• B. 1.1%
• C. 0.4%
• D. 0.1%