J physics 24

The device for measuring the angle of dip is

One main feature of trees in the savanna habitat is the possession of

Pilots uses aneroid barometer to know the height above sea level because

Calculate the power of an object which moves through a distance of 500cm in 1s on a frictionless surface by a horizontal force of 50N

The power of a convex lens of focal length 20cm is

A blacksmith heated a metal whose cubic expansivity is
\( 3.9 \times 10^{-6} \,\text{K}^{-1} \).
Calculate the area expansivity.

Under which conditions is work done

Using the diagram above, the effective force pushing it forward at an angle \( 60^\circ \) is

The simple form of the lead acid accumulator often has a negative pole of

The energy of light of frequency \( 2.0 \times 10^{15} \,\text{Hz} \) is
\(( h = 6.63 \times 10^{-34} \,\text{J·s} )\).

The charge of magnitude \( 1.6 \times 10^{-19} \,\text{C} \) is placed in a uniform electric field of intensity
\( 1200 \,\text{V m}^{-1} \). Calculate its acceleration, if the mass of the charge is
\( 9.1 \times 10^{-31} \,\text{kg} \).

An electron falls from an energy level of \( -5.44 \,\text{eV} \) to another energy level \( E \).
If the emitted photon is of wavelength \( 5.68 \times 10^{-6} \,\text{m} \), calculate the energy change.
( Planck's constant \(h = 6.63 \times 10^{-34} \,\text{J·s}, \quad
c = 3.0 \times 10^{8} \,\text{m s}^{-1} \) )

A body is pulled on a horizontal surface with a rope inclined at \( 30^\circ \) to the vertical.
If the effective force pulling the body along the horizontal surface is \( 15 \,\text{N} \),
calculate the tension on the rope.

The process of adding impurities to a semiconductor material to increase its conductivity is

A hydrometer of mass \( y \,\text{kg} \) and volume \( 2y \times 10^{-5} \,\text{m}^3 \)
floats in a fluid with 20% of its volume above the fluid, what is the density of the fluid?

Which of the following is not a part of model rocket?

Question:

The energy stored in the above capacitor is

The thermometer whose thermometric property is change in volume with temperature is

The acceleration of a free fall due to gravity is not a constant everywhere on the Earth's surface because

The stress experienced by a wire of diameter
\( \tfrac{y}{\pi} \,\text{m} \) loaded by a weight \( y^{2} \,\text{N} \) is

The energy in a moving car is an example of

An example of a non-rechargeable cell is

If a charged ion goes through combined electric field E and magnetic fields B, the resultant emergent velocity of the ion is

The force of attraction between molecules of the same substance is

The process by which plants loss water to the atmosphere is

Bifocal lens is used to correct the eye defect of

When a charged ebonite rod is brought near a charged glass rod, there will be

Find the amount of current required to deposit \( 0.02 \,\text{kg} \) of metal in a given electrolysis
for \( 120 \,\text{s} \).
( Electrochemical equivalent of the metal = \(1.3 \times 10^{-7} \,\text{kg C}^{-1} \) )

A boy standing 408m from a wall blew a trumpet and heard the echo 2.4s later. Calculate the speed of the sound

A solid cube of aluminum is \( 1.5 \,\text{cm} \) on each edge.
The density of aluminum is \( 2700 \,\text{kg m}^{-3} \).
Find the mass of the cube.

Calculate the depth of a swimming pool if the apparent depth is 10cm. ( Refractive index of water = 1.33 )

One of these is not the use of an electroscope

The gravitational force between two objects is 10N, what is the new value of the force if the distance between them is halved?

Rainbow is formed when sunlight undergoes

Bilateral symmetry,cylindrical bodies and double openings are characteristic features of

I. It wets glass

II. It needs to be coloured

III. It has a low density

Water is not suitable for use as a thermometric liquid because

The total number of ATP produced during glycolysis is

Use the diagram above to answer the question that follows

The zone labelled II is called

The efficiency of a cell with internal resistance of \( 2\,\Omega \) supplying current to a \( 6\,\Omega \) resistor is

Use the diagram above to answer the question that follows

The diagram above is