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Q:

Working of safety fuses depends upon

1. magnetic effect of the current

2. chemical effect of the current

3. magnitude of the current

4. heating effect of the current

Select the correct answer using the code given below.

A) 1, 2, 3 and 4	B) 1, 2 and 3 only
C) 3 and 4 only	D) 4 only

Answer & Explanation Answer: C) 3 and 4 only

Explanation:

An electric fuse is a device which is used to limit the current in an electric circuit. The fuse safeguards the circuit and the electrical appliances from being damaged.

The fuse wire is generally an alloy of lead and tin. It has a low melting point and breaks the circuit if the current exceeds a safe value. The thickness and length of the fuse wire depends on the maximum current allowed through the circuit.

It is connected in series in the beginning of the electric circuits.

If too many electrical appliances of high power rating (like electric iron, water heater etc) are switched on at the same time, they draw an extremely large current from the circuit. This condition is called overloading and it can cause overheating of the wiring and lead to a fire. (heating effect and magnitude of the current)

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Filed Under: Physics
Exam Prep: Bank Exams

Q:

Consider the following statements :

1. There is no net moment on a body which is in equilibrium.

2. The momentum of a body is always conserved.

3. The kinetic energy of an object is always conserved.

Which of the statements given above is/are correct?

A) 1, 2 and 3	B) 2 and 3 only
C) 1 and 2 only	D) 1 only

Answer & Explanation Answer: C) 1 and 2 only

Explanation:

There are two conditions that must be met for an object to be in equilibrium. The first condition is that the net force on the object must be zero for the object to be in equilibrium. If net force is zero, then net force along any direction is zero.

Kinetic energy (KE) is the energy of motion, and kinetic energy is not always conserved in a collision

Energy and momentum are always conserved.

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Filed Under: Physics
Exam Prep: Bank Exams

Q:

The average age of eight teachers in a school is 40 years. A teacher among them died at the age of 55 years whereas another teacher whose age was 39 years joins them. The average age of the teachers in the school now is (in years)

A) 35	B) 36
C) 38	D) 39

Answer & Explanation Answer: C) 38

Explanation:

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Filed Under: Problems on Ages
Exam Prep: Bank Exams

Q:

G and AD are respectively the centroid and median of the triangle ΔABC.The ratio AG:AD is

A) 3:2	B) 2:3
C) 3:1	D) 1:2

Answer & Explanation Answer: B) 2:3

Explanation:

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Filed Under: Volume and Surface Area
Exam Prep: Bank Exams

Q:

If $x + \frac{1}{x} = 5,$ then the value of $\frac{x}{1 + x + x^{2}}$ is

A) 1/5	B) 1/6
C) 5	D) 6

Answer & Explanation Answer: B) 1/6

Explanation:

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Filed Under: Simplification
Exam Prep: Bank Exams

Q:

If a+b=2c then the value of $\frac{a}{a - c} + \frac{c}{b - c}$ is equal to (where $a \neq b \neq c$ )

A) -1	B) 1
C) 0	D) 1/2

Answer & Explanation Answer: B) 1

Explanation:

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Filed Under: Simplification
Exam Prep: Bank Exams

Q:

If the simple interest on Rs. 400 for 10 years is Rs. 280, then rate of interest per annum is

A) 7%	B) 712%
C) 714%	D)

Answer & Explanation Answer: A) 7%

Explanation:

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Filed Under: Percentage
Exam Prep: Bank Exams

Q:

Which one of the following is the correct relation between the Kelvin temperature (T) and the Celsius temperature (fc)?

A) These are two independent temperature scales	B) T = tc
C) T = tc - 273.15	D) T = tc + 273.15

Answer & Explanation Answer: D) T = tc + 273.15

Explanation:

Lord Kelvin, working in Scotland, developed the Kelvin scale in 1848. His scale uses molecular energy to define the extremes of hot and cold. Absolute zero, or 0 K, corresponds to the point at which molecular energy is at a minimum. The Kelvin scale is preferred in scientific work, although the Celsius scale is also commonly used. Temperatures measured on the Kelvin scale are reported simply as K, not °K.

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