Physics 1 Marks Question

For solids with elastic modulus of rigidity, the shearing force is proportional to shear strain while for fluids it is proportional to rate of shear strain. With reference to the elastic modulus of rigidity for solids, the shearing force is proportional to the shear strain. With reference to the elastic modulus of rigidity for fluids, the shearing force is proportional to the rate of shear strain.

For a fluid in steady flow, the increases inflow speed at a constriction follows from conservation of mass while the decrease of pressure there follows from Bernoulli's principle. For a steady-flowing fluid, an increase in its flow speed at a constriction follows the conservation of mass/ Bernoulli's principle.

Viscosity of gases Increases with temperature, whereas viscosity of liquids decreases with temperature. Most fluids offer resistance to their motion. This is like internal mechanical friction, known as viscosity. Viscosity of gases increases with temperature, while viscosity of liquids decreases with temperature.

By doing so the area of outlet of water jet is reduced, so velocity of water increases according to equation of continuity, Area × Velocity = Constant.

Surface tension of liquids generally decreases with temperatures. The surface tension of a liquid is inversely proportional to temperature.

Density of air is the maximum near the sea level. Density of air decreases with increase in height from the surface. At a height of about 6km, density decreases to nearly half of its value at the sea level. Atmospheric pressure is proportional to density. Hence, at a height of 6km from the surface, it decreases to nearly half of its value at the sea level.

For the model of a plane in a wind tunnel, turbulence occurs at a Greater speed for turbulence for an actual plane (greater/ smaller). For the model of a plane in a wind tunnel, turbulence occurs at a greater speed than it does for an actual plane. This follows from Bernoulli's principle and different Reynolds' numbers are associated with the motions of the two planes.

Coefficient of viscosity n is less as compared to the value of honey. So, water flows faster than honey.

In the cotton wick, there are very large number of capillaries in which oil continues to rise.

It is a simple device which is used for measuring the velocity of the flow at any depth in a flowing liquid. It is based on Bernoulli's theorem.

This is done to reduce the backward drag of the atmosphere.

Systolic pressure.

In order to have low value of surface tension so that it can spread over large area.

When air is blown in between two balls suspended close to each other with high speed, a low pressure is created between the balls which is much less than the atmospheric pressure beyond the balls. Due to this, balls are attracted towards each other. This is according to Bernoulli's theorem.

The height of mercury in the inclined case will be 76cm.

Under normal conditions, it will be 76cm of vertical column. So, the height of mercury in the slant length has to be 76cm.

The liquid comes to rest due to the viscous force i.e., due to internal fluid friction between its different layers.

10.34m.

To compensate for excess pressure, the liquid rises.

No.

The apparent weight of the floating block is equal to zero because the weight of the block acting vertically downwards is balanced by the buoyant force acting on the block upwards.

Zero.

Surface tension of the liquid decreases.

The membrane has two surfaces. Force on frame due to surface tension = 8SL.

It is so because the pressure of water in reservoir increases with depth.

Because they have zero terminal velocity.

Due to increased velocity in the lesser cross-sectional area, the pressure will be less as there exists a streamlined flow.

Due to reduction in moment of inertia, angular velocity increases to keep the angular momentum constant.

Surface tension:

1. Reduces with increasing impurity.
2. Increases with decrease in temperature.

It will move up.

1. For a solid body of uniform density, the centre of gravity coincides with the centre of buoyancy.
2. For a solid body having different densities over different parts, its centre of gravity does not coincide with the centre of buoyancy.

Pressure increases as it is proportional to the depth we move into a liquid due to the weight of the liquid between the two layers.

This is done to increase the velocity of water flowing out of the pipe.

No, two streamlines cannot cross each other.

The pressure of air inside the bottle and the adhesive force between water and glass do not permit the water to get filled in the bottle with narrow neck.

Open tube manometer is used for measuring pressure difference.

Due to decrease in viscosity with increase of temperature.

Due to surface tension.