A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms^−1 from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is? (Take g = 10ms^−2)

• A. 5J
• B. 10J
• C. 15J
• D. 20J

A 2H inductor has negligible resistance and is connected to a 50/Ï€ Hz A.C. Supply. The reactance of the inductor is

• A. 200 Ω
• B. 50 Ω
• C. 100/π Ω
• D. 25/π Ω

Water falls through a height of 50m. Determine the temperature rise at the bottom of the fall. [Neglect energy losses. Specific heat capacity of water = 4200Jkg^-1 K^-1, g = 10ms²]

• A. 0.119^oC
• B. 0.840^oC
• C. 1.190^oC
• D. 8.400^oC

Which of the following is/are necessary for the production of interference with two wave trains? I. The sources must be close to each other. II The waves must have the same frequency. III. The waves must have the same amplitude. IV. The waves must travel with the speed of light.

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

Three electric cells each of e.m.f 1.5V and internal resistance of 1.0\(\Omega\) are connected in parallel across an external resistance of \(\frac{2}{3}\)\(\Omega\). Calculate the value of the current in the resistor

• A. 0.5 A
• B. 0.9A
• C. 1.5A
• D. 4.5A

In the diagram below, AB represents a uniform rod of length 1.50m which is in equilibrium on a pivot at P, If AP = 40cm, calculate the mass of the rod. [g = 10ms^-2]

• A. 0.280kg
• B. 0.400kg
• C. 0.613kg
• D. 0.800kg

The compressed regions and the space-out regions in longitude wave are refers to as

• A. Compression and Rarefaction
• B. Comparison and Explosion
• C. Reflection only
• D. Refraction only

A platinum resistance thermometer records 3.0\(\Omega\) at 0^oC and 8.0\(\Omega\) at 100^oC. If it records 6.0\(\Omega\) in a certain environment, The temperature of the medium is

• A. 80^oC
• B. 60^oC
• C. 50^oC
• D. 30^oC

A positively charged glass rod is placed near the cap of a positively charged electroscope. The divergence of the leaf is observed to

• A. decrease
• B. increase
• C. remain the same
• D. increase and collapse immediately

A projectile is fired at an angle of 30° to the horizontal with a velocity of 40 m/s Calculate the velocity attained after 1 s. [g = 10 m/s\(^2\)]