Springs of shock absorbers of automobiles and railway coaches are made of steel and not of rubber because steel is _____.

1. 1. Less elastic than rubber
   2. More elastic than rubber
   3. More durable than rubber
   4. Less expensive than rubber in the ling run

Surface tension in liquid is due to _____.

1. 1. Electrical for force between the molecules
   2. Adhesive force between the molecules
   3. Cohesive force between the molecules
   4. Gravitational force between the molecules

In T.V. transmission _____.

1. 1. Videos signal is transmitted first, followed by sound signal
   2. Sound and video signals are transmitted from different places at the same time
   3. Sound is transmitted first and then the video signa follows
   4. Sound and video signals are transmitted simultaneously

The hydraulic brakes used in automobiles is a direct application of _____.

1. 1. Pascal’s law
   2. Torricellian law
   3. Bernoulli’s theorem
   4. Archimedes principle

An old man, unable to apply a large force whishes to use screw jack for lifting his car wheels. If L is the length of the rod used to turn the jack and p is the pitch of jack screw, then he should use a jack in which _____.

1. 1. L is small and p is small
   2. L is large and p is large
   3. L is small and p is large
   4. L is large and p is small

The working of the receiver of a telephone depends upon the _____.

1. 1. Efficiency of the loudspeaker which enhances the loudness of sound
   2. Diaphragm which is made to vibrate by the incoming sound wave
   3. Change in magnetization of an electromagnet, which causes a diaphragm to vibrate
   4. Conversion of electric signal, after its amplification into sound wave

Erect and virtual images are always produced by _____.

1. 1. Concave mirrors alone
   2. Plane mirrors alone
   3. Concave and and convex mirrors
   4. Plane and convex mirrors

When a moving bus stops suddenly, the passengers are pushed forward because of the _____.

1. 1. Friction between the passengers and the earth
   2. Inertia of the passengers
   3. Frictions between the earth and the bus
   4. Inertia of the bus

A car and a loaded truck are moving with the same speed along a road. As compared to the truck, the car shall possess _____.

1. 1. More potential energy
   2. More kinetic energy
   3. Less kinetic energy
   4. More mechanical energy

Electronics is the study of _____.

1. 1. Flow of molecules
   2. Flow of photons
   3. Flow of electrons
   4. All of these