Questions
When a liquid or a gas is heated, what will be the effect on its density?
- It increases.
- It decreases.
- It remains the same.
- It first decreases, then increases.
- It first increases, then decreases.
The SI unit of density is
- kgm-3
- gcm-3
- Newton
- msec-1
- No unit
What do we call the reflection from a rough surface?
- Diffuse reflection
- Regular reflection
- Sometimes it is regular reflection and sometimes it is diffuse reflection
- Both (1) and (2)
- Total internal reflection
Which of the following is called the dark region of a shadow?
- Penumbra
- Umbra
- Total shadow
- Half shadow
- Dark patch
A dry cell converts chemical energy into which of the following types of energy?
- Potential energy
- Mechanical energy
- Electrical energy
- Kinetic energy
- Nuclear energy
A closed path in which electric current flows is called an
- electric path
- electric potential
- electric circuit
- electric circle
- electric flow
Which of the following is a translucent object?
- Chalk
- Table
- Wood
- Butter paper
- Clear glass
Pinhole camera works on which of the following principles?
- Reflection of light
- Refraction of light
- Interference
- Total internal reflection
- Light travels in a straight line
Which of the following is not required for an electric circuit?
- A bulb
- A switch
- Connecting wire
- A cell
- Ampere
Which of the following is the upper fixed point in the Fahrenheit scale?
- - 32oF
- - 212oF
- 212oF
- 273oF
- 373oF
The phenomenon due to which left hand side of an object appears as the right hand side and vice-versa is called
- diffraction
- refraction
- lateral inversion
- reflection
- front inversion
An invisible energy which causes the sensation of vision is called
- sound energy
- heat energy
- light energy
- mechanical energy
- electrical energy
Which of the following substances sublimes?
- Chlorine
- Sodium
- Fluorine
- Bromine
- Iodine
Weight of a body
- changes with time
- changes with pressure
- changes with place
- remains the same
- changes with temperature
One complete to and fro motion of a pendulum is called
- oscillation
- wavelength
- amplitude
- time period
- frequency
The density of water is maximum at which of the following temperatures?
- 4oC
- 0oC
- 9oC
- 6oC
- 2oC
Sound cannot travel in which of the following mediums?
- Solid
- Liquid
- Gas
- Vacuum
- Sound does not require any medium.
The pitch of a sound depends upon
- frequency
- time period
- amplitude
- oscillation
- wavelength
Sound is produced by
- heating
- cooling
- a rotating body
- a vibrating body
- a moving body
The maximum displacement of the bob of a pendulum from its mean position is called
- extreme position
- mean position
- amplitude
- wavelength
- frequency
Which of the following optical devices is used in solar cooker?
- Convex mirror
- Concave mirror
- Plane mirror
- Concave lens
- Convex lens
By the virtue of which of the following properties do solids increase in size on heating?
- Thermal expansion
- Thermal swelling
- Thermal enlargement
- All of the above
- None of these
Which of the following is a scalar quantity?
- Displacement
- Velocity
- Acceleration
- Distance
- Angular momentum
Why we cannot see the shadow of bird flying in the sky?
- The extended source of light (the Sun) is very large as compared to the opaque body (the bird).
- The bird is very small as compared to the diameter of the Sun.
- The umbra formed by the bird is so small that it finishes in the air while the penumbra formed is very light and faint, i.e. hardly visible.
- The shadow of the bird cannot be formed.
- All of the above
Why does a pendulum clock lose time during summers?
- The length of the pendulum decreases.
- The length of the pendulum increases.
- The mass of the bob increases.
- The acceleration due to gravity increases during summers.
- Amplitude of the pendulum clock increases.
Which of the following is used in periscopes?
- Concave mirror
- Convex lens
- Plane mirror
- Cylindrical lens
- Planoconvex lens