Q.1:- Red light is used for signals because it has ?
- Long wavelength
- High intensity
- High frequency
- Low refraction in the medium
Q.2:- After long periods of use, a grey spot develops on the inside of a bulb. This is because ?
- The tungsten filament evaporates and collects there
- The heat of the bulb scorches the glass at the top
- Dust inside the bulb condenses on the top
- Glass undergoes a change due to the heat
Q.3:- Necessary element of change in solar energy to electric energy ?
- Berillium
- Silicon
- Tantelum
- Pure Copper
Q.4:- A microscope used in pathological laboratories forms ?
- Magnified, virtual, erect image
- Diminished, real and erect image
- Magnified, virtual and inverted image
- Diminished, virtual and erect image
Q.5:- The ‘Four Stroke Petrol Engine’ is based on ?
- Carnot Cycle
- Otto Cycle
- Diesel Cycle
- Boyle’s Cycle
Q.6:- A gap is left between two rails of a railway track to accommodate ……… of the metal.
- Areal expansion
- Volume expansion
- Liner expansion
- Apparent expansion
Q.7:- The final image in a simple microscope is ?
- Real, diminished and inverted
- Real, magnified and erect
- Virtual, magnified and erect
- Virtual, diminished and erect
Q.8:- Water is used in car radiator because of its ?
- Low density
- Easy availability
- High specific heat capacity
- Low boiling point
Q.9:- Speed of sound in air is unaffected by change in ?
- Pressure
- Humidity
- Temperature
- Volume
Q.10:- A periscope works on the principle of ?
- Refraction
- Total internal reflection
- Diffraction
- Reflection
Q.11:- A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is ?
- Zero
- One
- Less than one
- More than one
Q.12:- Hypermetropia or longsight can be corrected by using ?
- Bifocal Lenses
- Cylindrical Lenses
- Concave Lenses
- Convex Lenses
Q.13:- A fuse wire is made of ?
- An alloy of Tin and Copper
- An alloy of Tin and Lead
- An alloy of Tin and Aluminium
- An alloy of Nickel and Chromium
Q.14:- An instrument used to measure humidity is ?
- Anemometer
- Hygrometer
- Thermometer
- Pyrheliometer
Q.15:- For a ray of light to suffer total internal reflection it has to pass from ?
- Glass to water
- Water to glass
- Air to water
- Air to glass
Q.16:- The Newton’s First Law is also called as ?
- Law of moments
- Law of inertia
- Law of energy
- Law of momentum
Q.17:- The blue colour of sky is due to ?
- Reflection of sunlight
- Refraction of sunlight
- Scattering of shorter wavelengths of sunlight in the atmosphere
- Scattering of longer wavelengths of sunlight in the atmosphere
Q.18:- In the Earth, the weight of a body is maximum at the ?
- North Pole
- South Pole
- Equator
- Surface
Q.19:- A concave lens always forms ?
- A Real image
- A virtual image
- An image type which depends on object characteristics
- An image type which depends on lens curvature
Q.20:- Hydraulic machines work under the Principle of ?
- Newton’s Law
- Joules Law
- Pascal’s Law
- Floatation Law
Q.21:- The water from a hand pump is warm in winter because ?
- Our body is cold in winter and the water appears to be warm
- The temperature inside the Earth is higher than the atmospheric temperature
- The pumping process causes friction which warms up the water
- Inside water comes out and absorbs heat from the environment
Q.22:- Ozone layer in the outer atmosphere helps us in ?
- Reflecting radio waves and makes radio communication possible
- Regulating the temperature of atmosphere
- Absorbing cosmic ray particles
- Absorbing U-V radiations
Q.23:- The technique of collecting information about an object from a distance without making physical contact with it is ?
- Remote sensing
- Remote control
- Remote accessing
- Space shuttle
Q.24:- A solid needle placed horizontally on the surface of the water floats due to ?
- Capillary action
- Water pressure
- Surface tension of water
- Viscosity of water
Q.25:- Water is used in hot water bags because ?
- It is easily obtained
- It is cheaper and is not harmful
- It has high specific heat
- It is easy to heat water
