User Forum

Read the given statements and select the correct option.
Statement 1 : Work done against friction in moving a body over a closed path is zero.
Statement 2 : Work done by a constant force is always zero in a round trip of the point of application of force.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is false but statement 2 is true.
D Both statements 1 and 2 are false.

Read the passage carefully and answer the following questions.
Two tuning forks, A and B vibrate with frequencies in the ratio 2 : 7 and their wavelengths in the ratio 3 : 4 respectively. Both the tuning forks are placed in different media.
In which of the tuning fork the velocity of sound produced is greater?

A Tuning fork A.
B Tuning fork B.
C Both produce sound of same velocity.
D Cannot say.

6.0 light years. The time taken by the light to reach the Earth from the star is about (speed of light = 3 × 10⁸ m/s)

A9.46 × 10⁶ s
B1.70 × 10⁷ s
C1.89 × 10⁸ s
D1.89 × 10⁸ s

Which factor will most likely cause a decrease in the force of attraction between two magnets?

A Increasing the size of the two magnets
B Increasing the distance between the two magnets
C Changing the color of the two magnets
D None of these

The given figure shows four stages in the life cycle of a housefly. If all four stages are kept in an empty container without food and water, which stages will be able to survive?


AP and S
BR and S
CP and Q
DQ and S

X is a gaseous planet that rotates in clockwise direction unlike others. Which of the following could be X?

A Venus
B Jupiter
C Mars
D Uranus

Four identical bulbs are connected to a circuit as shown in the given figure. Due to fluctuations in the voltage, the bulb B₃ blows off.

(A voltmeter measures voltage and it allows almost no current to pass through it.) Now consider the following statements.
I. Reading of the voltmeter V₁, after the blowing off is 20 V.
II. Reading of the voltmeter V₂, after the blowing off is zero.
III. Reading of voltmeter V₁, before the blowing off is 4 V.
IV. Reading of voltmeter V₂, before the blowing off is 5 V.
The incorrect statements are

AII and III only
BI, II and III only
CII, III and IV only
DI and III only.

Which of the following mixtures can be separated easily into two groups with the help of a magnet?

AToothpicks and matchsticks
BIron nails and steel needles
CIron nails and sugar cubes
DShredded paper and fallen leaves

Three bulbs P, Q and R are connected as shown in the given figure. The bulbs Q and R are identical. If the bulb R gets fused, then


ABrightness of both the bulbs P and Q will increase
BBrightness of both the bulbs P and Q will decrease
CBrightness of the bulb P decreases and that of bulb Q increases
DNone of the bulbs will glow.

Which of the following rocks are formed by the deposition of small fragments of rocks within water bodies, like river, lake and sea?

A Granite
B Obsidian
C Shale
D None of these