A stone of mass 20g is released from a catapult whose rubber is stretched through 5cm. If the force constant of the rubber is 200Nm\(^{-1}\), calculate the speed with which the stone leaves the catapult.

The atmospheric pressure due to water is 1.3 x 10⁶Nm^-2. What is the total pressure at the bottom of an ocean 10m deep? [Density of water = 1000kgm^-3, g = 10ms^-2]

• A. 1.3 x 10⁷Nm^-2
• B. 1.4 x 10⁶Nm^-2
• C. 1.4 x 10⁵Nm^-2
• D. 1.0 x 10⁵Nm^-2

A semiconductor is formed by?

• A. co-ordinate bonds
• B. electrovalent bonds
• C. a substance free of bonds
• D. covalent bonds

The below figure shows the motion of a progressive wave along a string. The particle motion of the medium is in direction

• A) parallel to OX
• B) parallel to OY
• C) 60o to OX
• D) 60v to OY

A person standing waist-deep in a swimming pool appears to have short legs because of light?

• A. diffraction
• B. refraction
• C. reflection
• D. interference

Heat transfer in the surrounding without a material medium is possible through?

• A. Conduction
• B. Convection
• C. Radiation
• D. Expansion

A wire of length 15m made of a material of resistivity 1.8 x 10^-6\(\Omega\)m has a resistance of 0.27\(\Omega\). Determine the area of the wire

• A. 1.5 x 10^-4m²
• B. 1.0 x 10^-4m²
• C. 2.7 x 10^-5m²
• D. 7.3 x 10^-6m²

A magnet is being inserted into a coil of wire. On which of the following factors does the induced e.m.f in the coil depend? I. Number of turns in the coil II. Strength of the coil III. Speed with which magnet is inserted into the coil.

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

At what frequency would a 10H inductor have a reactance of 2000Ω?

• A. π/200Hz
• B. π/100Hz
• C. 100/πHz
• D. 100πHz

Calculate the velocity ratio of a screw jack of pitch 0.3cm if the length of the tommy bar is 21cm

• A. \(\frac{1}{140}\)\(\pi\)
• B. 14\(\pi\)
• C. 70\(\pi\)
• D. 140\(\pi\)