Tension

Q.

The frequency $\mathrm{n}$ of vibration of a stretched string depends upon its length $\mathrm{l}$, its mass per unit length $\mathrm{m}$ and Tension $\mathrm{t}$ in the string. Obtain dimensionally an expression for frequency $\mathrm{n}$.

Q.

Which of the following is the law of vibrating string?

1. The fundamental frequency is directly proportional to the square of the tension in the string.

2. The fundamental frequency of stretched string is inversely proportional to the square root of the tension in the string.

3. The fundamental frequency is inversely proportional to the square root of the linear mass density.

4. Both (a) and (c)

Q.

Tension in the rope at the rigid support is $\left(g=10m/s^2\right)$

Q.

A net force F is required to give an object with mass m an acceleration a. If a net force 6F is applied to an object with mass 2m, what is the acceleration on this object?

1. a

2. 2a

3. 3a

4. 4a

Q.

Two stretched strings have lengths $l$ and $2l$ while tensions are $T$ and $4T$ respectively. If they are made of same material, the ratio of their frequencies is :

1. $2:1$

2. $1:2$

3. $1:1$

4. $1:4$

Q. A stone is suspended with the help of a thread as shown in the below figure. What are the forces that are acting on the stone.

1. Gravitational force
2. Tension
3. Muscular force
4. Magnetic force

Q.

Explain an application where we reduce pressure acting on a body ?

Q.

What do you mean by state of motion? What are the parameters to measure it? Can a body at rest be described by these parameters

Q.

The force exerted by a spring in its natural length is ___ .

Q.

Which of the following is not the law of stretched string?

[$n,l,T$ and $m$ are frequency, length, tension in string and linear mass density, respectively.]

1. $n\propto \sqrt{T}$

2. $n\propto l$

3. $n\propto \frac{1}{\sqrt{\mu }}$

4. Both (a) and (b)

Q.

Define Tension force

Q. the working principle of ball point pen is
a) surface tension
b) gravity
c) viscosity
d) Bernoullis theorem

Q.

Two weights ${\text{w}}_1$ and ${\text{w}}_2$ are suspended on the ends of a string on a frictionless pulley. When pulled up with an acceleration g, the tension in the string is?

Q.

Rewrite the following statement correctly:

The force exerted by animals/humans is called mechanical force.

Q. In a game of tug of wars, both teams are at equilibrium. If both the teams pull the rope with a force of $104N$. The tension in the rope is:

1. $104N$
2. $105N$
3. $0N$
4. $208N$

Q. The tension in a string is an example of electromagnetic force.

Q.

Which of the following does the frequency of vibration of a string depend on?

1. Its length

2. its linear density

3. tension of the string

4. all the above

Q.

A bullet fired with a speed of 50 $\frac{m}{s}$ is stopped at a depth of 10 cm by a wall .What is the retardation offered by the wall ?

Q.

The two ends of a spring-balance are pulled each by a force of $10\mathrm{kg}$-wt. What will be the reading of the balance?

Q. A chain of mass $10kg$ and length $10m$ us resting on a rough horizontal surface $(\mu =0.2)$. A constant force of $20$ Newton is applied at one end. The tension in the mid point of the chain is

1. $20N$
2. $15N$
3. $10N$
4. $5N$

Q. Observe the image and try to find the nature of force applied by Jacob and Lucas on the rope.

1. Jacob: Pull, Lucas: Push
2. Jacob: Pull, Lucas: Pull
3. Jacob: Push, Lucas: Pull
4. Jacob: Push, Lucas: Push

Q. ..............is a push or a pull acting upon an object.

1. energy
2. work
3. force
4. pressure

Q.

if a stationary was suddenly speed job passenger are thrown in backward direction why is it so

Q. a solid cylinder of mass $m=4kg$ and radius $R=10cm$ has two ropes wrapped around it, one near each end. The cylinder is held horizontally by fixing the two free ends of the cords to the hooks on the ceiling such that both the cords are exactly vertical. The cylinder is released to fall under gravity.
Find the tension along the strings.

1. $6.53$N
2. $5.23$N
3. $3.23$N
4. $4.43$N

Q.

why the doors and windows make sound during rainy season

Q. Three monkeys $A,B$ and $C$ with masses of $10,15$ & $8kg$ respectively are climbing up & down the rope suspended from $D$. At the instant represented, $A$ is descending the rope with an acceleration of $2m/s^2$ & $C$ is pulling himself up with acceleration of $1.5m/s^2$. Monkey $B$ is climbing up with a constant speed of $0.8m/s$. Calculate the tension $T$ in the rope at $D$. $(g=10m/s^{-2})$

Q. The tension in the string connected between blocks is.

1. $\frac{80}{3}N$
2. $\frac{40}{3}N$
3. $\frac{50}{7}N$
4. $26N$

Q. A spring balance is acted upon by two forces $3N$ each on two ends as shown in figure. Reading in spring balance will be

1. 3 N
2. 6 N
3. 9 N
4. zero

Q. Two blocks of masses 2kg and 1 kg are placed on a smooth horizontal table i contact with each other.A horizontal force of 3 newton is applied on the first so that the block moves with a constant acceleration. The force between the blocks would be:-

1. 3 N
2. 2 N
3. 1 N
4. ZERO

Q. A decoration, of mass $M$, is suspended by a string from the ceiling inside an elevator. The elevator is traveling upward at a constant speed. The tension in the string is

1. $LessthanMg$
2. $GreaterthanMg$
3. $EqualtoMg$
4. $Impossibletotellwithoutknowingthespeed$