5. which of the following statements about viscosity is correct?
a. engine oil is less viscous than water.
b. viscosity is a property of liquids only.
c. viscosity increases with rise in temperature.
d. glycerine is more viscous than water.

6. the motion of a body is uniform when
a. there is change in the direction of the body.
b. the speed of the body remains constant.
c. the rate of change of the velocity of the body is constant.
d. both the speed and direction of the body remain constant.

7.
distance vs time graph with lines i, ii, iii, iv
in which of the following distance-time graphs drawn above is the motion slowest?
a. i
b. ii
c. iii
d. iv

8. the area under a velocity-time graph represents
a. final speed attained.
b. acceleration.
c. total distance covered.
d. work done.

9. which of the following quantities is a scalar quantity?
a. magnetic field
b. electric field intensity
c. electric potential
d. magnetic flux density

10. two forces of magnitudes 30 n and 40 n act at an angle of 90° to each other. calculate the magnitude of their resultant.
a. 10.0 n
b. 20.0 n
c. 35.0 n
d. 50.0 n

11. the energy in a light beam travels through space in concentrated packets called
a. electrons.
b. photons.
c. protons.
d. neutrons.

Question

5. which of the following statements about viscosity is correct?
a. engine oil is less viscous than water.
b. viscosity is a property of liquids only.
c. viscosity increases with rise in temperature.
d. glycerine is more viscous than water.

6. the motion of a body is uniform when
a. there is change in the direction of the body.
b. the speed of the body remains constant.
c. the rate of change of the velocity of the body is constant.
d. both the speed and direction of the body remain constant.

7.
distance vs time graph with lines i, ii, iii, iv
in which of the following distance-time graphs drawn above is the motion slowest?
a. i
b. ii
c. iii
d. iv

8. the area under a velocity-time graph represents
a. final speed attained.
b. acceleration.
c. total distance covered.
d. work done.

9. which of the following quantities is a scalar quantity?
a. magnetic field
b. electric field intensity
c. electric potential
d. magnetic flux density

10. two forces of magnitudes 30 n and 40 n act at an angle of 90° to each other. calculate the magnitude of their resultant.
a. 10.0 n
b. 20.0 n
c. 35.0 n
d. 50.0 n

11. the energy in a light beam travels through space in concentrated packets called
a. electrons.
b. photons.
c. protons.
d. neutrons.

Accepted Answer

### Question 5
# Brief Explanations:
- Option A: Engine oil is more viscous than water, so A is wrong.
- Option B: Viscosity is a property of both liquids and gases, so B is wrong.
- Option C: For liquids, viscosity decreases with rise in temperature; for gases, it increases. So C is wrong.
- Option D: Glycerine is more viscous than water, which is correct.
# Answer: D. Glycerine is more viscous than water.

### Question 6
# Brief Explanations:
- Uniform motion means constant velocity, which requires both speed and direction to be constant.
- Option A: Change in direction means velocity changes, not uniform.
- Option B: Speed constant but direction may change (e.g., circular motion), so not uniform.
- Option C: Rate of change of velocity is acceleration; constant acceleration means non - uniform motion (e.g., projectile motion).
- Option D: Both speed and direction constant means constant velocity, so uniform motion.
# Answer: D. both the speed and direction of the body remain constant.

### Question 7
# Brief Explanations:
In a distance - time graph, the slope of the graph represents speed ($v=\frac{\Delta d}{\Delta t}$). A smaller slope means slower motion. Among the graphs I, II, III, IV, the graph with the least slope (shallowest line) is IV. So the motion is slowest in graph IV.
# Answer: D. IV

### Question 8
# Brief Explanations:
- The area under a velocity - time graph:
  - If velocity $v$ is a function of time $t$, then the area $A=\int v\mathrm{d}t$. And since $v = \frac{\mathrm{d}s}{\mathrm{d}t}$, then $\int v\mathrm{d}t=\int\frac{\mathrm{d}s}{\mathrm{d}t}\mathrm{d}t=\int\mathrm{d}s$, which is the total distance covered.
  - Option A: Final speed is the value of velocity at a particular time, not the area.
  - Option B: Acceleration is the slope of velocity - time graph ($a=\frac{\Delta v}{\Delta t}$).
  - Option D: Work done is related to force and displacement, not directly to velocity - time graph area.
# Answer: C. total distance covered.

### Question 9
# Brief Explanations:
- Scalar quantities have only magnitude, vector quantities have magnitude and direction.
- Option A: Magnetic field is a vector (has direction).
- Option B: Electric field intensity is a vector (has direction).
- Option C: Electric potential is a scalar (only magnitude, no direction).
- Option D: Magnetic flux density is a vector (has direction).
# Answer: C. Electric potential

### Question 10
# Explanation:
## Step1: Recall the formula for resultant of two perpendicular forces
When two forces $F_1$ and $F_2$ act at an angle $	heta = 90^{\circ}$ to each other, the magnitude of the resultant force $R$ is given by the Pythagorean theorem: $R=\sqrt{F_1^{2}+F_2^{2}}$.
Here, $F_1 = 30\space N$ and $F_2=40\space N$.
## Step2: Substitute the values into the formula
$R=\sqrt{(30)^{2}+(40)^{2}}=\sqrt{900 + 1600}=\sqrt{2500}$
## Step3: Calculate the square root
$\sqrt{2500}=50\space N$
# Answer: D. 50.0 N

### Question 11
# Brief Explanations:
- The energy in a light beam travels in the form of photons.
- Option A: Electrons are charged particles, not light energy packets.
- Option C: Protons are sub - atomic particles in the nucleus, not related to light energy.
- Option D: Neutrons are sub - atomic particles in the nucleus, not related to light energy.
# Answer: B. photons.

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Question 5

Answer:

Question 6