Physics-

General

Easy

Question

# The diagram shows a force-extension graph for a rubber band. Consider the following statements

I. It will be easier to compress this rubber than expand it

II. Rubber does not return to its original length after it is stretched

III. The rubber band will get heated if it is stretched and released

Which of these can be deduced from the graph

- III only
- II and III
- I and III
- I only

## The correct answer is: III only

### Area of hysterisis loop gives the energy loss in the process of stretching and unstretching of rubber band and this loss will appear in the form of heating

### Related Questions to study

physics-

### A wire of length Land radius rigidly fixed at one end. On stretching the other end of the wire with a force F, the increase in its length is If another wire of same material but of length 2L and radius is stretched with a force 2F, the increase in its length will be

Young’s modulus

Since for same material Young’s modulus is same,

or

or

Since for same material Young’s modulus is same,

or

or

### A wire of length Land radius rigidly fixed at one end. On stretching the other end of the wire with a force F, the increase in its length is If another wire of same material but of length 2L and radius is stretched with a force 2F, the increase in its length will be

physics-General

Young’s modulus

Since for same material Young’s modulus is same,

or

or

Since for same material Young’s modulus is same,

or

or

physics-

### The variation of intensity of magnetization with respect to the magnetizing field (H) in a diamagnetic substance is described by the graph in figure.

For a dia-magnetic substance, is negative and Therefore, the variation is represented by . As magnetisation is small, is better choice.

### The variation of intensity of magnetization with respect to the magnetizing field (H) in a diamagnetic substance is described by the graph in figure.

physics-General

For a dia-magnetic substance, is negative and Therefore, the variation is represented by . As magnetisation is small, is better choice.

Maths-

### The number of one one onto functions that can be defined from A={a,b,c,d} into B={1,2,3,4} is

STEP BY STEP SOLUTION

Number of one-one functions =

Number of one-one functions = 0 if

As we know the given set A & B is

A = and B =

Here cardinality of A =

Cardinality of B =

Number of one-one functions =

We can see that n=m

So, the number of one-one functions =

By using the formula,

The total number of one-one functions = 24

Number of one-one functions =

Number of one-one functions = 0 if

As we know the given set A & B is

A = and B =

Here cardinality of A =

Cardinality of B =

Number of one-one functions =

We can see that n=m

So, the number of one-one functions =

By using the formula,

The total number of one-one functions = 24

### The number of one one onto functions that can be defined from A={a,b,c,d} into B={1,2,3,4} is

Maths-General

STEP BY STEP SOLUTION

Number of one-one functions =

Number of one-one functions = 0 if

As we know the given set A & B is

A = and B =

Here cardinality of A =

Cardinality of B =

Number of one-one functions =

We can see that n=m

So, the number of one-one functions =

By using the formula,

The total number of one-one functions = 24

Number of one-one functions =

Number of one-one functions = 0 if

As we know the given set A & B is

A = and B =

Here cardinality of A =

Cardinality of B =

Number of one-one functions =

We can see that n=m

So, the number of one-one functions =

By using the formula,

The total number of one-one functions = 24

maths-

### The number of ways one can arrange words with the letters of the word ’ so that ↑MADHURI↑ always vowels occupy the beginning, middle and end places is

3 vowels, 3 places ! remaining !

Total ! 4!

Total ! 4!

### The number of ways one can arrange words with the letters of the word ’ so that ↑MADHURI↑ always vowels occupy the beginning, middle and end places is

maths-General

3 vowels, 3 places ! remaining !

Total ! 4!

Total ! 4!

Maths-

### If defined by

### If defined by

Maths-General

physics

### An ant goes from P to Q on a circular path in 20 second Radius OP=10 m . What is the average speed and average velocity of it ?

### An ant goes from P to Q on a circular path in 20 second Radius OP=10 m . What is the average speed and average velocity of it ?

physicsGeneral

Maths-

Which of the following functions is not injective?

Which of the following functions is not injective?

Maths-General

physics

### The graph of position time shown in the figure for a particle is not possible because ....

### The graph of position time shown in the figure for a particle is not possible because ....

physicsGeneral

physics-

### Curie-Weiss law is obeyed by iron

Iron is a ferromagnetic substance and ferromagnetic substance obeys Curie-Weiss law above its Curie temperature.

### Curie-Weiss law is obeyed by iron

physics-General

Iron is a ferromagnetic substance and ferromagnetic substance obeys Curie-Weiss law above its Curie temperature.

physics-

### If the curves of two samples of P and Q of iron are as shown below, then which one of the following statements is correct?

For permanent magnet we prefer a material with high retentivity (so as to make a stronger magnet) and high coercivity (so that magnetization may not be wiped out easily). For electromagnet we prefer high saturated magnetism, low coercivity and least possible area of hysteresis loop so that electromagnet develops high magnetization, is easily demagnetized and energy loss in a magnetization cycle is least. Therefore, Pis suitable for making permanent magnet and Q for making electromagnet.

### If the curves of two samples of P and Q of iron are as shown below, then which one of the following statements is correct?

physics-General

For permanent magnet we prefer a material with high retentivity (so as to make a stronger magnet) and high coercivity (so that magnetization may not be wiped out easily). For electromagnet we prefer high saturated magnetism, low coercivity and least possible area of hysteresis loop so that electromagnet develops high magnetization, is easily demagnetized and energy loss in a magnetization cycle is least. Therefore, Pis suitable for making permanent magnet and Q for making electromagnet.

physics-

### Among the following properties describing diamagnetism identify the property that is wrongly stated

Diamagnetic materials have negative susceptibility. Thus, (c) is wrongly stated.

### Among the following properties describing diamagnetism identify the property that is wrongly stated

physics-General

Diamagnetic materials have negative susceptibility. Thus, (c) is wrongly stated.

physics-

### Permanent magnet has properties retentivity and coercivity respectively

The materials for a permanent magnet should have high retentivity (so that the magnet is strong) and high coercivity (so that the magnetism is not wiped out by stray magnetic fields). As the material in this case is never put to cyclic changes of magnetization, hence hysteresis is immaterial.

### Permanent magnet has properties retentivity and coercivity respectively

physics-General

The materials for a permanent magnet should have high retentivity (so that the magnet is strong) and high coercivity (so that the magnetism is not wiped out by stray magnetic fields). As the material in this case is never put to cyclic changes of magnetization, hence hysteresis is immaterial.

physics-

### The magnetic susceptibility of a paramagnetic substance at C is 0.0060, then its value atC will be

Therefore,

Or

Or

### The magnetic susceptibility of a paramagnetic substance at C is 0.0060, then its value atC will be

physics-General

Therefore,

Or

Or

physics-

### If a magnetic substance is kept in a magnetic field then which of the following substance is thrown out?

Magnetic substance when kept in a magnetic field is feebly repelled or thrown out if the substance is diamagnetic.

### If a magnetic substance is kept in a magnetic field then which of the following substance is thrown out?

physics-General

Magnetic substance when kept in a magnetic field is feebly repelled or thrown out if the substance is diamagnetic.

physics-

### Curie temperature is the one above which

The curie temperature or curie point of a ferromagnetic material is the temperature above which it looses its characteristic ferromagnetic ability to possess a net magnetization in the absence of an external magnetic field. Hence, above curie temperature material is purely paramagnetic.

### Curie temperature is the one above which

physics-General

The curie temperature or curie point of a ferromagnetic material is the temperature above which it looses its characteristic ferromagnetic ability to possess a net magnetization in the absence of an external magnetic field. Hence, above curie temperature material is purely paramagnetic.