Q.1:- Water cannot be used to extinguish fire caused by electric current, because ?
- It may cause electrocution
- It may cause hydrolysis
- It may cause electrolysis
- It may spoil the wiring
Q.2:- Stars appear twinkling because of _______ of light.
- Reflection
- Scattering
- Emission
- Absorption
Q.3:- It is dangerous to observe Solar eclipse with naked eyes because ?
- Infrared radiations from sun burn our retina
- Ultraviolet radiations from sun burn our retina
- All radiations from sun initiate chemical reactions in eyes
- Cosmic rays reach eyes more during the eclipse
Q.4:- A copper disc has a hole. If the disc is heated, the size of the hole ?
- Increases
- Decreases
- No Change
- First increases and then decreases
Q.5:- In a railway track, two rails are joined end to end with a gap in between them because ?
- Steel can be saved
- Accidents due to contraction in winter can be avoided
- Air gaps are necessary for bearing the weight of running train
- Accidents due to expansion in summer can be avoided
Q.6:- Optical fibres are based on the phenomenon of ?
- Interference
- Dispersion
- Diffraction
- Total Internal Reflection
Q.7:- The atmospheric air is held to the Earth by ?
- Gravity
- Winds
- Clouds
- Rotation of the Earth
Q.8:- Vehicle tyres are inflated properly ?
- To ensure smooth running
- To allow the vehicle to take more load
- To avoid skidding and to minimise friction
- To go fast and save fuel
Q.9:- Name the process of production of energy in the Sun ?
- Nuclear fission
- Radioactivity
- Nuclear fusion
- Ionization
Q.10:- One can distinguish a telescope from a microscope by observing ?
- Length
- Colour
- Size of the lens
- Length and size of the lens
Q.11:- Gamma rays have greatest similarity with ?
- Alpha rays
- Beta rays
- X-rays
- V. rays
Q.12:- ‘Shock-Absobers’ are usually made of steel as it ?
- Is not brittle
- Has lower elasticity
- Has higher elasticity
- Has no ductile property
Q.13:- The time period of a pendulum when taken to the Moon would ?
- Remain the same
- Decrease
- Become zero
- Increase
Q.14:- In a nuclear reactor, one of the following is used as a fuel ?
- Coal
- Uranium
- Radium
- Diesel
Q.15:- The density of the liquid when heated ?
- Decreases
- Increases
- Does not change
- May increase or decrease
Q.16:- In MRI machine, which one of the following is used ?
- Sound wave
- X-ray
- Ultra sound wave
- Magnetic wave
Q.17:- Bolometer is used to measure ?
- Frequency
- Temperature
- Velocity
- Wavelength
Q.18:- Spectacles used for viewing 3D films have ?
- Bifocal Lens
- Convex lens
- Concave lens
- Polaroids
Q.19:- Which layer of the Earth’s atmosphere reflect back the radio waves to the Earth’s surface ?
- Ionosphere
- Stratosphere
- Mesosphere
- Exosphere
Q.20:- The process involved in making soap is ?
- Saponification
- Hydrolysis
- Condensation
- Polymerisation
Q.21:- The cause for the Tsunami, as deduced by the seismologists, is ?
- Gravitational pull of the moon
- Low pressure trough in the ocean
- Deformation of sea floor and vertical displacement of water
- Sudden change in the monsoon wind
Q.22:- A person is hurt on kicking a stone due to ?
- Inertia
- Velocity
- Reaction
- Momentum
Q.23:- The hydraulic brakes used in automobiles is a direct application of ?
- Archimedes’ principle
- Toricellian law
- Bernoulli’s theorem
- Pascal’s law
Q.24:- A multimeter is used to measure ?
- Current
- Voltage
- Resistance
- All of the above
Q.25:- ‘Short-Sight’ in human eye can be corrected by using proper ?
- Convex lens
- Concave lens
- Cylindrical lens
- Bifocal lens
