Q.1:- Quality of a musical note depends on ?
- Fundamental frequency
- Amplitude of the wave
- Harmonics present
- Velocity of sound in the medium
Q.2:- A particle is thrown vertically upward. When it reaches the highest point, it has ?
- A downward acceleration
- An upward acceleration
- A downward velocity
- A horizontal velocity
Q.3:- Which one of the following is an Ohmic conductor ?
- Germanium
- Silicon
- Carbon
- Silver
Q.4:- Parabolic mirrors are used in ?
- Car headlights
- Driving mirrors
- Dentists mirrors
- Shaving mirrors
Q.5:- Rise of oil a wick is due to ?
- Density of the oil
- Viscosity of the oil
- Surface tension of the oil
- Pressure of the oil
Q.6:- Bats can sense obstacles because they produce ?
- Supersonic sound waves
- Ultrasonic sound waves
- Infrasonic sound waves
- Micro Sound Waves
Q.7:- A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments ?
- Is zero
- Depends on the total mass of all the fragments
- Depends on the speeds of various fragments
- Is infinity
Q.8:- ‘Hydraulic Brakes’ work on the principle of ?
- Pascal’s law
- Thomson’s law
- Newton’s law
- Bernoulli’s theorem
Q.9:- Red is used as an emergency or danger signal as ?
- It is a striking colour
- Its wavelength is the longest
- It is scattered
- It has very high energy
Q.10:- A device used for converting A.C. into D.C. is called ?
- Transformer
- Rectifier
- Induction coil
- Dynamo
Q.11:- The metal used to make lightning conductors is ?
- Iron
- Aluminium
- Copper
- Zinc
Q.12:- The type of mirrors used in the headlamps of cars is ?
- Parabolic Concave
- Plane
- Spherical Convex
- Cylindrical Concave
Q.13:- Which one of the following lenses should be used to correct the defect of astigmatism ?
- Cylindrical lens
- Concave lens
- Convex lens
- Bifocal lens
Q.14:- Fibre optics work on the principle of ?
- Scattering of light
- Total internal absorption
- Total internal reflection
- Optical rotation
Q.15:- Superconductors are those elements ?
- Whose conductivity is intermediate between metals and insulators
- Whose resistance falls almost to zero at very low temperatures
- Which turn into insulators at very low temperatures
- Which conduct electricity only at super-high temperatures
Q.16:- The swing of a spinning cricket ball in air can be explained on the basis of ?
- Sudden change in wind direction
- Buoyancy of air
- Turbulence caused by wind
- Bernoulli’s Theorem
Q.17:- The energy stored in a watch spring is ?
- Kinetic Energy
- Potential Energy
- Heat Energy
- Chemical Energy
Q.18:- A pond of water appears less deep due to ?
- Reflection
- Diffraction
- Refraction
- Polarisation
Q.19:- Clear nights are colder than cloudy nights because of ?
- Conduction
- Condensation
- Radiation
- Insolation
Q.20:- Clothes keep us warm in winter because they ?
- Supply heat
- Do not radiate heat
- Prevent air from contacting the body
- Prevent the heat of the body from escaping
Q.21:- At boiling point of liquids, its ?
- Temperature increases
- Atmospheric pressure increases
- Temperature remains constant
- Vapour pressure decreases
Q.22:- When temperatures difference between liquid and its surroundings is doubled. The rate of loss of heat will ?
- Remain same
- Double
- Three times
- Four times
Q.23:- Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in ?
- Conduction
- Convection
- Radiation
- Both Conduction and Convection
Q.24:- Name of the process by which bubbles from liquid are formed ?
- Effervescence
- Surface Tension
- Surface Energy
- Degasification
Q.25:- Which of the metals has the maximum thermal conductivity ?
- Iron
- Aluminium
- Silver
- Copper
