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4651.

Sir I want to know in detail about anomalous expansion of water and it's applications. Thanks.

Answer» Sir I want to know in detail about anomalous expansion of water and it's applications.

Thanks.
4652.

Write true or false for each statement: (a) A fuse wire has a high melting point. (b) Flow of protons constitutes electric current. (c) A fuse wire is made of silver. (d) S.I. unit and commercial unit of electrical energy are same. (e) Overloading of electric current in circuits can lead to short circuiting. (f) Our body can pass electricity through it. (g) The metallic cases of all appliances are insulators of electricity. (h) The earth wire protects us from an electric shock. (i) A switch should not be touched with wet hands. (j) All electrical appliances in a household circuit work at the same voltage. (k) In a cable,the green wire is the live wire. (l) A fuse is connected to the live wire. (m) A switch is connected to the neutral wire.

Answer»

Write true or false for each statement:

(a) A fuse wire has a high melting point.

(b) Flow of protons constitutes electric current.

(c) A fuse wire is made of silver.

(d) S.I. unit and commercial unit of electrical energy are same.

(e) Overloading of electric current in circuits can lead to short circuiting.

(f) Our body can pass electricity through it.

(g) The metallic cases of all appliances are insulators of electricity.

(h) The earth wire protects us from an electric shock.

(i) A switch should not be touched with wet hands.

(j) All electrical appliances in a household circuit work at the same voltage.

(k) In a cable,the green wire is the live wire.

(l) A fuse is connected to the live wire.

(m) A switch is connected to the neutral wire.

4653.

A sound wave has a time period of 0.5 s. How many times does a particle pass through a given point in one second?

Answer»

A sound wave has a time period of 0.5 s. How many times does a particle pass through a given point in one second?

4654.

Question 3 (f) Fill in the blanks : (f ) Clothes of ___ colours absorb heat better than clothes of light colours.

Answer»

Question 3 (f)
Fill in the blanks :
(f ) Clothes of ___ colours absorb heat better than clothes of light colours.

4655.

What is the difference between wrist watch and a stop watch?

Answer» What is the difference between wrist watch and a stop watch?
4656.

Thermal expansion is seen more in

Answer»

Thermal expansion is seen more in


4657.

Question 11 A virtual image larger than the object can be produced by a (i) concave lens (ii) concave mirror (iii) convex mirror (iv) plane mirror

Answer»

Question 11
A virtual image larger than the object can be produced by a

(i) concave lens
(ii) concave mirror
(iii) convex mirror
(iv) plane mirror

4658.

The shadow formed due to a point source of light has_____.

Answer»

The shadow formed due to a point source of light has_____.


4659.

What is the are of the shaded part in the figure, if its given that the side of square ABCD is 90 m and the side of square PQRS is 100 m?

Answer»

What is the are of the shaded part in the figure, if its given that the side of square ABCD is 90 m and the side of square PQRS is 100 m?


4660.

An arrow fired from a bow attains a maximum height of 5m from the level it is released. If the mass of the arrow is 500grams, work done by the bow on arrow is greater than which of the following? (Assume, g=10ms−2)

Answer»

An arrow fired from a bow attains a maximum height of 5m from the level it is released. If the mass of the arrow is 500grams, work done by the bow on arrow is greater than which of the following? (Assume, g=10ms2)


4661.

The electric bulb will glow only when the circuit containing it ______.

Answer»

The electric bulb will glow only when the circuit containing it ______.


4662.

When we bring a magnetic needle near a current carrying conductor it gets deflected. This deflection is an example of:

Answer»

When we bring a magnetic needle near a current carrying conductor it gets deflected. This deflection is an example of:


4663.

In nuclear fission, which will have greater mass among reactant and product ?

Answer»

In nuclear fission, which will have greater mass among reactant and product ?


4664.

Why appliances are implemented in parallel circuit?

Answer»

Why appliances are implemented in parallel circuit?


4665.

What is the mode of heat transfer on the top of the fire and on the sides of the fire?

Answer»

What is the mode of heat transfer on the top of the fire and on the sides of the fire?

4666.

The word ‘E’ appears in a plane mirror as ′∃′ due to

Answer»

The word ‘E’ appears in a plane mirror as due to


4667.

By which mode of heat transfer is heat from Sun transferred to Earth's atmosphere?

Answer»

By which mode of heat transfer is heat from Sun transferred to Earth's atmosphere?


4668.

at certain place the angle of dip is 30 degrees horizontal component of magnetic field is 0.5 the Earth's magnetic field is ans is 1/ root3

Answer»

at certain place the angle of dip is 30 degrees horizontal component of magnetic field is 0.5 the Earth's magnetic field is

ans is 1/ root3

4669.

Which car is moving at a higher speed?

Answer»

Which car is moving at a higher speed?


4670.

The pressure applied by the air which is present above us is known as ___ pressure.

Answer»

The pressure applied by the air which is present above us is known as ___ pressure.

4671.

How are biomass fuels produced?

Answer»

How are biomass fuels produced?


4672.

If a wooden spoon is dipped in a cup of ice-cream Why will its other end not become cold

Answer» If a wooden spoon is dipped in a cup of ice-cream
Why will its other end not become cold

4673.

Explain the formation of a thunderstorm.

Answer» Explain the formation of a thunderstorm.
4674.

Which of these is not a type of storm?

Answer»

Which of these is not a type of storm?


4675.

___ is a collection of two or more cells.

Answer»

___ is a collection of two or more cells.

4676.

The scale on the thermometer says oC indicating:

Answer»

The scale on the thermometer says oC indicating:


4677.

What does the area below v–t graph give?

Answer»

What does the area below vt graph give?


4678.

If the path length covered by a body is zero then

Answer»

If the path length covered by a body is zero then


4679.

explain how water is heated by convection? What is a sea and land breze.

Answer»

explain how water is heated by convection? What is a sea and land breze.

4680.

A tank 5 m high is half filled with water and then is filled to the top with oil of density 0.85g/cm3. The pressure at the bottom of the tank, due to these liquids is

Answer»

A tank 5 m high is half filled with water and then is filled to the top with oil of density 0.85g/cm3. The pressure at the bottom of the tank, due to these liquids is


4681.

A girl decides to go for shopping. The mall is 5 km from her home. She covers the first 3 km at a speed of 30 km/hr. She is stuck in traffic for 6 minutes and covers rest of the distance at 40 km/hr. How much time did she take to reach the mall? Also, find her average speed. [5 MARKS]

Answer»

A girl decides to go for shopping. The mall is 5 km from her home. She covers the first 3 km at a speed of 30 km/hr. She is stuck in traffic for 6 minutes and covers rest of the distance at 40 km/hr. How much time did she take to reach the mall? Also, find her average speed. [5 MARKS]

4682.

Which tone is represented in the following passage? As that hurricane threatened, the wind's blast caused angry fifteen-foot waves to crash over the small houses near the shore.

Answer» Which tone is represented in the following passage? As that hurricane threatened, the wind's blast caused angry fifteen-foot waves to crash over the small houses near the shore.
4683.

Among the three states of matter, sound travels fastest in the ___ state.

Answer»

Among the three states of matter, sound travels fastest in the ___ state.

4684.

When we hold our hands close to the side of a flame, they get warmed up mainly due to - (a)Conduction as well as Convection (b)Conduction (c)Radiation (d)Convection Pls. explain

Answer» When we hold our hands close to the side of a flame, they get warmed up mainly due to -
(a)Conduction as well as Convection
(b)Conduction
(c)Radiation
(d)Convection

Pls. explain
4685.

The relation between time and displacement for two particles is given by, y1=0.06 sin 2π (0.04t+ϕ1), y2=0.03 sin 2π (1.04t+ϕ2) The ratio of the intensity of the waves produced by the vibrations of the two particles will be [MP PMT 1991]

Answer»

The relation between time and displacement for two particles is given by, y1=0.06 sin 2π (0.04t+ϕ1), y2=0.03 sin 2π (1.04t+ϕ2)

The ratio of the intensity of the waves produced by the vibrations of the two particles will be

[MP PMT 1991]


4686.

An electric ___ provides the complete path for electricity to pass between the two terminals of an electric cell.

Answer»

An electric ___ provides the complete path for electricity to pass between the two terminals of an electric cell.

4687.

Question 8 The correct symbol to represent the speed of an object is (a) 5 m/s (b) 5 mp (c) 5m/s−1 (d) 5 s/m

Answer»

Question 8

The correct symbol to represent the speed of an object is

(a) 5 m/s

(b) 5 mp

(c) 5m/s1

(d) 5 s/m

4688.

Which of the following is not a type of energy source?

Answer»

Which of the following is not a type of energy source?


4689.

While drinking water, we lift a glass of water up to a certain height. Does the water in that glass also posses potential energy?

Answer»

While drinking water, we lift a glass of water up to a certain height. Does the water in that glass also posses potential energy?

4690.

What is the use of an alcohol thermometer?

Answer»

What is the use of an alcohol thermometer?


4691.

Two rods of different materials, having coefficients of linear expansion α1 and α2 and Young's moduli Y1 and Y2 respectively, are fixed between two rigid walls. The rods are heated to the same temperature. There is no bending of the rods. If α1:α2=2:3, the thermal stress developed in the two rods will be equal provided Y1:Y2 is equal to

Answer»

Two rods of different materials, having coefficients of linear expansion α1 and α2 and Young's moduli Y1 and Y2 respectively, are fixed between two rigid walls. The rods are heated to the same temperature. There is no bending of the rods. If α1:α2=2:3, the thermal stress developed in the two rods will be equal provided Y1:Y2 is equal to


4692.

How does a fuse work. Can you please send me the answer fastly in priyam.sarkarmsdgmail.com.Because I have a test tomorrow.

Answer» How does a fuse work. Can you please send me the answer fastly
in priyam.sarkarmsdgmail.com.Because I have a test tomorrow.
4693.

What is meant by enthalpy and entropy please explain in a very detailed way?

Answer»

What is meant by enthalpy and entropy please explain in a very detailed way?

4694.

1. Magnetic field lines around a magnet cannot intersect. 2. When magnetic field lines intersect, the compass at the point of intersection can point in two different directions. Choose the correct option.

Answer»

1. Magnetic field lines around a magnet cannot intersect.
2. When magnetic field lines intersect, the compass at the point of intersection can point in two different directions.
Choose the correct option.


4695.

Trachea is commonly referred to as _____ pipe.

Answer»

Trachea is commonly referred to as _____ pipe.


4696.

During solar eclipse ______ comes in between the sun and ______.

Answer»

During solar eclipse ______ comes in between the sun and ______.

4697.

The primary aim of the Watershed Management is to increase the production of what?

Answer»

The primary aim of the Watershed Management is to increase the production of what?


4698.

Define heat.

Answer»

Define heat.

4699.

What is standardization? What is its importance?

Answer» What is standardization? What is its importance?
4700.

Does air get heated up through convection or radiation?

Answer» Does air get heated up through convection or radiation?