Question 1

As compared to the volume occupied by gas, the volume of particles is
A)more
B)infinite
C)negligible
D)less than the volume of gas

Accepted Answer

The volume of particles in a gas is considered negligible compared to the volume occupied by the gas itself, as the particles are far apart in the gaseous state.

Question 2

Pressure of gas depends on the
A)density of gas
B)mean square speed of gas molecules
C)both A and B
D)temperature

Accepted Answer

The pressure of a gas depends on both the density of the gas and the mean square speed of gas molecules. According to the kinetic theory of gases, pressure is directly proportional to the density of the gas (more molecules in a given volume means more collisions with the container walls) and the mean square speed of the molecules (faster molecules exert more force upon collision).

Question 3

At standard pressure and temperature the average speed of molecules is A)400 m s^-1 B)500 m s^-1 C)600 m s^-1 D)700 m s^-1

Accepted Answer

The average speed of molecules at standard pressure and temperature is approximately 400 m s^-1.

Question 4

Speed of sound in water is 1500 m s^-1, depth of water when reflected sound waves are detected after 0.40 s is {{}} A)700 m B)600 km C)600 m D)750 km

Accepted Answer

The speed of sound in water is 1500 m/s. To find the depth, we use the formula distance = speed × time. However, since the sound travels to the bottom and back, the time should be halved for the one-way trip. Thus, depth = 1500 m/s × (0.40 s / 2) = 1500 m/s × 0.20 s = 300 m. The correct calculation for depth should indeed result in 300 m, not 600 m as previously stated, due to the halving of the time for the one-way trip.

Question 5

If a snail crawls 12 cm in 60 s then it's average speed in mm s^-1 is {{}} A)2 mm s^-1 B)5 mm s^-1 C)10 mm s^-1 D)20 mm s^-1

Accepted Answer

12 cm = 120 mm120 mm / 60 s = 2 mm/s

Question 6

Speed of a body in particular direction can be called
A)acceleration
B)displacement
C)velocity
D)distance

Accepted Answer

Velocity is defined as the speed of a body in a specific direction.

Question 7

If distance is increasing uniformly with time, then velocity is
A)increasing
B)decreasing
C)constant
D)zero

Accepted Answer

When distance increases uniformly with time, it means the rate of change of distance with respect to time is constant, which is the definition of constant velocity.

Question 8

If the slope of a graph is zero and so the displacement, then velocity is
A)increasing
B)decreasing
C)constant
D)zero

Accepted Answer

If the slope of a graph is zero, it indicates a constant value. When displacement is also zero, it means there has been no change in position over time, implying that the velocity is zero.

Question 9

Speed of snail as compared to speed of a car will be in units {{}} A)cm s^-1 B)m s^-1 C)km s^-1 D)km h-1

Accepted Answer

The speed of a snail is much slower than that of a car and is typically measured in centimeters per second (cm/s), reflecting its slow pace.

Question 10

{{}} If a river flows from west to east with constant velocity of 1.0 m s^-1 and a boat leaves south bank heading towards north with velocity of 2.40 m s^-1 , then resultant velocity of boat is A)2.6 m s^-1 B)2.7 m s^-1 C)2.8 m s^-1 D)2.9 m s^-1

Accepted Answer

The resultant velocity of the boat can be found using the Pythagorean theorem since the velocities are perpendicular to each other: $\sqrt{(1.0)^2 + (2.4)^2} = \sqrt{1 + 5.76} = \sqrt{6.76} = 2.6 \, \text{m/s}$.

Question 11

Two sides of a rectangular table are 0.8 m and 1.2 m, the displacement of spider when it runs a distance of 2.0 m is
A)1.5 m
B)1.4 m
C)1.6 m
D)1.7 m

Accepted Answer

The displacement of the spider is the shortest distance between its starting and ending points, which can be found using the Pythagorean theorem. Since the table is rectangular with sides 0.8 m and 1.2 m, and the spider runs a total distance of 2.0 m, it's not directly related to the total distance run but the diagonal it might cover. The diagonal (displacement) can be calculated as the square root of the sum of the squares of the sides: sqrt((0.8)^2 + (1.2)^2) = sqrt(0.64 + 1.44) = sqrt(2.08) ≈ 1.44 m.

Question 12

Distance travelled by a body in time 't' is
A)instantaneous speed
B)average velocity
C)average acceleration
D)instantaneous acceleration

Accepted Answer

Distance travelled by a body in time 't' is described by its average velocity, assuming the direction of motion does not change. Instantaneous speed and acceleration refer to specific moments, and average acceleration involves change in velocity, not distance.

Question 13

Displacement is a
A)scalar quantity
B)vector quantity
C)base quantity
D)derived quantity

Accepted Answer

Displacement is a vector quantity because it has both magnitude and direction.

Question 14

A car is travelling at 15 m s^-1, the distance it will travel in 1 hour is {{}} A)54 km B)55 km C)56 km D)57 km

Accepted Answer

To find the distance traveled in 1 hour (3600 seconds) by a car moving at 15 m/s, use the formula distance = speed × time. Thus, distance = 15 m/s × 3600 s = 54000 m = 54 km.

Question 15

A car travelled south-west for 200 miles depicts
A)distance
B)speed
C)velocity
D)displacement

Accepted Answer

The answer of A car travelled south-west for 200 miles...

Question 16

Sum of e.m.f around any loop equals
A)sum of current
B)sum of potential difference
C)sum of resistances
D)sum of charges passing through it per second

Accepted Answer

The sum of the electromotive force (e.m.f) around any loop equals the sum of potential differences across all elements in the loop, according to Kirchhoff's voltage law.

Question 17

Current entering and leaving a point in a circuit should be
A)equal
B)decreasing
C)increasing
D)variable

Accepted Answer

According to Kirchhoff's current law, the total current entering a junction is equal to the total current leaving the junction.

Question 18

Current through each resistor when they are connected in series is
A)different
B)same
C)can be both A and B
D)decreasing

Accepted Answer

In a series circuit, the current flowing through each resistor is the same because there is only one path for the current to take.

Question 19

If a billion electrons enter a point in 1 s, then number of electrons leaving that point in 1 s are
A)2 billion
B)3 billion
C)1 billion
D)10 billion

Accepted Answer

In a steady state, the number of electrons entering a point in a given time will equal the number of electrons leaving that point in the same amount of time, assuming no accumulation of charge at that point.

Question 20

Three resistances 20 Ω, 30 Ω and 60 Ω are connected in parallel, their combined resistance is given by
A)110 Ω
B)50 Ω
C)20 Ω
D)10 Ω

Accepted Answer

The combined resistance $R_p$ of resistors in parallel is given by $\frac{1}{R_p} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3}$. For 20 Ω, 30 Ω, and 60 Ω, $\frac{1}{R_p} = \frac{1}{20} + \frac{1}{30} + \frac{1}{60} = \frac{3}{60} + \frac{2}{60} + \frac{1}{60} = \frac{6}{60} = \frac{1}{10}$, so $R_p = 10$ Ω.

Quiz 12: Electrical Circuit and Current

As compared to the volume occupied by gas, the volume of particles is

Pressure of gas depends on the

At standard pressure and temperature the average speed of molecules is

Speed of sound in water is 1500 m s-1, depth of water when reflected sound waves are detected after 0.40 s is {{}}

If a snail crawls 12 cm in 60 s then it's average speed in mm s-1 is {{}}

Speed of a body in particular direction can be called

If distance is increasing uniformly with time, then velocity is

If the slope of a graph is zero and so the displacement, then velocity is

Speed of snail as compared to speed of a car will be in units {{}}

{{}} If a river flows from west to east with constant velocity of 1.0 m s-1 and a boat leaves south bank heading towards north with velocity of 2.40 m s-1 , then resultant velocity of boat is

Two sides of a rectangular table are 0.8 m and 1.2 m, the displacement of spider when it runs a distance of 2.0 m is

Distance travelled by a body in time 't' is

Displacement is a

A car is travelling at 15 m s-1, the distance it will travel in 1 hour is {{}}

A car travelled south-west for 200 miles depicts

Sum of e.m.f around any loop equals

Current entering and leaving a point in a circuit should be

Current through each resistor when they are connected in series is

If a billion electrons enter a point in 1 s, then number of electrons leaving that point in 1 s are

Three resistances 20 Ω, 30 Ω and 60 Ω are connected in parallel, their combined resistance is given by

Speed of sound in water is 1500 m s^-1, depth of water when reflected sound waves are detected after 0.40 s is {{}}

If a snail crawls 12 cm in 60 s then it's average speed in mm s^-1 is {{}}

{{}} If a river flows from west to east with constant velocity of 1.0 m s^-1 and a boat leaves south bank heading towards north with velocity of 2.40 m s^-1 , then resultant velocity of boat is

A car is travelling at 15 m s^-1, the distance it will travel in 1 hour is {{}}