User Forum

Motion of strings of a guitar shows
(i) oscillatory motion
(ii) vibratory motion
(iii) random motion
(iv) rotational motion

A (i) and (ii)
B (i) and (iii)
C (ii) and (iii)
D (ii) and (iv)

Observe the given situation and answer the following questions. Rahul and Ravi are playing in a ground. They start running from the same point X simultaneously in the ground and reach point Y at the same time by following paths marked 1 and 2 respectively, as shown in the figure.


Which one of the following paths does show the displacement?

A XY
B XOY
C XOYX
D XYO

Four pieces of wooden sticks P, Q, R and S are placed along the length of 15 cm long scale as shown in figure. What is the average length of these sticks?


A 2.0 cm
B 2.5 cm
C 2.6 cm
D 2.9 cm

Water pollution caused by drains could be avoided or reduced by ____.

ASpeedy disposal and proper treatment
BRegular servicing of vehicles and using clean fuels
CSewage treatment before disposal
DDischarging domestic waste into rivers.

Read the following statements carefully and select the correct option.
Statement 1: The poles of a magnet can never be separated.
Statement 2 : When a bar magnet is broken, each piece will have only one pole and its magnetism is enhanced.

ABoth statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true and statement 2 is false.
DBoth statements 1 and 2 are false.

Refer to the given figures and select the correct option regarding these, when they are operating.



AObject I converts mechanical energy into kinetic energy whereas object II converts electrical energy into potential energy.
BObject II converts electrical energy into kinetic, heat and sound energy.
CObject I converts potential energy into kinetic energy.
DBoth B and C

Sandhya made a musical instrument as shown in the figure using large wooden box, a broom handle and a length of string.
She tightened the string by pulling harder on the broom handle. What kind of sound will she hear now?


A A higher pitched note
B A louder note
C A lower pitched note
D None of these

What conclusion can be drawn from the experiment?



AStirring increases solubility, solubility increases with decrease in temperature.
BStirring increases solubility, solubility increases with increase in temperature.
CStirring decreases solubility, solubility decreases with increase in temperature.
DStirring decreases solubility, solubility increases with decrease in temperature.

Bob is trying to turn rod P into a magnet by the following stroking method. He finds that this method does not work. Which two of the following could be the possible explanations?

(1) He should stroke rod P with the south-pole instead.
(2) The bar magnet is not touching rod P.
(3) The bar magnet stroke rod P in more than one direction.
(4) Rod P is not a magnetic material.

A1 and 2
B2 and 3
C2 and 4
D3 and 4

In the given apparatus, air is inhaled and exhaled through tube P. Tubes X and Y are closed subsequently at different times.

What will happen when
(i) Tube X is closed with a clip and air is exhaled ?
(ii) Tube Y is closed with a clip and air is inhaled ?

A
B
C
D