If we apply oil on door hinges, the friction will
$(a)$. increase
$(b)$. decrease
$(c)$. disappear altogether
$(d)$. will remain unchanged

Academic Physics NCERT Class 8

Applying oil to door hinges will decrease the friction because oil works as a smoothening agent.

So, option $(b)$ is correct.

Tutorialspoint

Simply Easy Learning

Updated on: 10-Oct-2022

53 Views

A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid:(a) will decrease (b) will increase(c) will become zero (d) will remain the same
How we can increase or decrease friction?
Fresh milk has a pH of 6. When milk changes into curd, the pH value will:(a) Become 7 (b) Become less than 6 (c) Become more than 7 (d) Remain unchanged
The resistance of a resistor is reduced to half of its initial value. In doing so, if other parameters of the circuit remain unchanged, the heating effects in the resistor will become(A) two times. (B) half.(C) one-fourth. (D) four times.
Which condition out of the following will increase the evaporation of water?(a) Increase in temperature of water.(b) Decrease in temperature of water.(c) Less exposed surface area of water.(d) Adding common salt to water.
Which one of the following solutions will not conduct electricity?$(a)$. Lemon juice $(b)$. Vinegar$(c)$. Tap water $(d)$. Vegetable oil
The evaporation of water increases under the following conditions :(a) increase in temperature, decrease in surface area(b) increase in surface area, decrease in temperature(c) increase in surface area, rise in temperature(d) increase in temperature, increase in surface area, addition of common salt
In the circuit shown in the figure, when the switch is moved to the ’ON’ position,$(a)$. the bulb A will glow first$(b)$. the bulb B will glow first$(c)$. the bulb C will glow first$(d)$. all bulbs will glow together."
To separate the mixture of sand, oil and water, which methods we will use?
In some cases we deliberately increase friction. Explain why?
The work done by a force acting obliquely is given by the formula: $W=F\cos\theta\times s$. What will happen to the work done if the angle $\theta$ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant?
Why Java will Remain Programming Language for 2023
A key of mechanical piano is first struck gently and then struck again but much harder this time. In the second case:(a) sound will be louder but pitch will not be different(b) sound will be louder and the pitch will also be higher(c) sound will be louder but pitch will be lower(d) both loudness and pitch will remain unaffected
A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case$(a)$. sound will be louder but pitch will not be different$(b)$. sound will be louder and pitch will also be higher$(c)$. sound will be louder but pitch will be lower$(d)$. both loudness and pitch will remain unaffected
The image distance from the eye lens in the normal eye when we increase the distance of an object from the eye:(A) increases. (B) decreases.(C) remains unchanged. (D) depends on the size of the eyeball.

Kickstart Your Career

Get certified by completing the course

Get Started

Advertisements