RBSE Solutions Class 10 Science Chapter 20 Road Safety Education

Evils Of Drunken Driving

This lesson is about the dangers of drunken driving. Alcohol weakens the control and coordination in the body. So, driving while under the influence of alcohol can be very dangerous for life. It is crucial to always drive sober to prevent accidents.

Exercise:

Question 1. Can taking coffee or some medicine or doing some exercise help in reducing the alcohol level in blood?
Answer: No, coffee, medicines, or exercise cannot help reduce the alcohol level in the blood. The body needs time to process alcohol naturally. Only time can truly lower the alcohol concentration in a person's system.
In simple words: No, things like coffee or exercise do not make alcohol leave your blood faster. You just have to wait for your body to process it.

🎯 Exam Tip: Remember that no quick fixes work for reducing blood alcohol content; only time allows the liver to metabolize alcohol.

Question 2. Does alcohol increases self confidence or a person or it is just a myth?
Answer: It is just a myth that alcohol increases a person's self-confidence. While some people might feel more confident after drinking, this is often a false sense of courage that impairs judgment. In reality, alcohol can make a person less careful and lead to poor decisions.
In simple words: It's a false belief that alcohol makes you more confident. It actually makes you less careful and can cause problems.

🎯 Exam Tip: Highlight that any perceived increase in confidence from alcohol is a deceptive effect, as it actually impairs critical abilities like judgment and reaction time.

Good Eyesight And Safe Driving

Exercise:

Question 1. Which type of bulb is used in fog lamps?
Answer: Tungsten-halogen bulbs are typically used in fog lamps. These bulbs produce a yellow light which is very effective in cutting through fog and rain. The yellow light has a longer wavelength that scatters less in dense conditions.
In simple words: Fog lamps use special tungsten-halogen bulbs that make yellow light. This yellow light helps drivers see better when there is fog.

🎯 Exam Tip: Mentioning both the bulb type and the yellow light's property of less scattering is key for a complete answer.

Question 2. How does a yellow and transparent tape help in driving under foggy conditions?
Answer: Yellow light is in the middle of the white light spectrum and scatters least when passing through fog. So, if a yellow and transparent tape is used on headlights, the yellow light can be seen from far away in foggy weather. This helps other drivers know you are there, making the roads safer. Yellow light penetrates dense fog more effectively than other colors.
In simple words: Yellow tape helps in fog because yellow light scatters less. This makes your vehicle more visible to other drivers from a distance.

🎯 Exam Tip: Focus on the concept of light scattering and how yellow light's properties improve visibility in adverse conditions like fog.

Road Discipline

Exercise:

Question 1. What is the reason for banning the use of cell-phone while driving?
Answer: Using a cell phone while driving causes a major distraction to the driver. It reduces their alertness and takes their attention away from the road, which can lead to very serious accidents. Distracted driving is a leading cause of collisions and injuries on the road.
In simple words: Using a cell phone while driving is banned because it distracts the driver and can cause dangerous accidents.

🎯 Exam Tip: Emphasize "distraction" and "reduced alertness" as the core reasons for the ban, leading to "fatal accidents."

Question 2. Which type of punishment is prescribed for use of cell-phone while driving?
Answer: The punishment prescribed for using a cell phone while driving typically includes a fine of Rs. 1000 and/or six months of jail time. This strict punishment aims to deter drivers from engaging in this dangerous behavior. The penalties are in place to ensure road safety for everyone.
In simple words: If you use a cell phone while driving, you can get a fine of Rs. 1000 or go to jail for six months, or both.

🎯 Exam Tip: Clearly state the specific fine amount and potential jail term mentioned in the rules for this offense.

Question 4. Name any two traffic signs.
Answer: Two common traffic signs are "Left turn" and "Don't Honk." Traffic signs are important visual cues that help drivers understand rules and navigate safely. There are many other signs like stop, yield, speed limit, and no entry.
In simple words: Two traffic signs are "Left turn" and "Don't Honk."

🎯 Exam Tip: When asked for examples, choose clear, simple, and universally recognized traffic signs.

Lamps And Mirrors

This lesson is about the types of mirrors used in vehicles. A concave mirror is used in the reflector of the headlight, while a convex mirror is used in the rear-view mirror and side mirror. These mirrors help the driver in safe driving by providing clear visibility. The design of these mirrors is crucial for the vehicle's functionality.

Exercise:

Question 2. A convex mirror is used in rear view mirror. Why?
Answer: A convex mirror provides a very wide field of view. This means it can show vehicles from a much broader area behind the driver compared to a flat mirror. Because it allows the driver to see more of the surroundings, a convex mirror is used in the rear-view mirror for enhanced safety. The image formed by a convex mirror is always virtual, erect, and diminished.
In simple words: A convex mirror is used in rear-view mirrors because it lets the driver see a wider area behind the car, helping them drive more safely.

🎯 Exam Tip: The key reason for using convex mirrors in vehicles is their ability to offer a wider field of view, which improves situational awareness.

Electricity

This lesson is about the importance of regular maintenance of vehicles for safe driving. Special focus has been given to the maintenance of the battery. Regular checks ensure that all parts are working correctly, preventing sudden breakdowns or accidents.

Exercise:

Question 1. A 12 V bulb with 60 W rating is used in a headlight of a car. Calculate the electric current in lighting this bulb.
Answer:
Given:
Potential difference \( V = 12 \, V \)
Power \( P = 60 \, W \)
Current \( I = ? \)
Current can be calculated using the formula \( P = VI \).
\[ I = \frac{P}{V} \]
\[ I = \frac{60}{12} \]
\[ I = 5 \, \text{Ampere} \]
So, the electric current flowing through the bulb is 5 Amperes. This calculation helps ensure the correct components are used.
In simple words: We know the power and voltage, so we can divide the power (60 W) by the voltage (12 V) to find the current, which is 5 Amperes.

🎯 Exam Tip: Always remember the power formula \( P = VI \) and use the correct units for each quantity in your calculations.

Question 3. Why does a battery get discharged if it is not used for a long time?
Answer: Even when a battery is not in use, a slow chemical reaction keeps happening inside it. This process, known as self-discharge, occurs at a slower rate than when in use, but it still consumes the stored energy over time. Therefore, if a battery is left unused for a long period, it will gradually lose its charge and become discharged. This is why devices left off for a long time might have dead batteries.
In simple words: A battery loses charge even when not used because a slow chemical reaction still happens inside it. This makes it lose power over time.

🎯 Exam Tip: Understand the concept of "self-discharge," which is the gradual loss of charge in a battery even when it's not powering anything, due to internal chemical reactions.