7th Class General Science Unit 11 Technology in Everyday Life MCQs (روزمرہ زندگی میں ٹیکنالوجی) | PAKMCQs

Carefully use water in order to avoid any wastage is correct because water conservation focuses on sustainable usage and preventing water loss.

70% is correct because oceans, seas, rivers, and lakes cover approximately 70% of Earth's surface.

30% is correct because continents and islands make up the remaining 30% of the terrestrial surface.

98% is correct because saline water in oceans and seas accounts for around 98% of all global water.

2% is correct because only 2% of Earth's total water reserves constitute non-saline fresh water.

87% is correct because the vast majority of fresh water is frozen in polar ice caps and glaciers (87%).

12% is correct because subterranean aquifers and soil moisture represent 12% of the world's fresh water.

1% is correct because accessible surface water in rivers and freshwater lakes makes up only 1% of total fresh water.

Water is correct because biological hydration and metabolic reactions require water as an essential solvent for life.

Domestic purposes is correct because household chores and personal hygiene represent domestic water usage.

Yes, water is needed is correct because crop irrigation and manufacturing heavily depend on abundant freshwater supplies.

Increasing population is correct because rapid demographic expansion drives up global demand for fresh water.

Water scarcity is correct because acute shortage of potable water (water scarcity) already severely impacts many arid regions.

Safe and clean water is correct because contamination and shortages deprive millions of access to safe drinking water.

Travel for a long distance is correct because women and children often must travel several kilometers daily to fetch water.

World Bank, UNICEF, United Nations is correct because the cited global statistical data was published by the World Bank, UNICEF, and the UN.

30% is correct because global economic and population growth is projected to increase water consumption by 30% by 2050.

2.1 billion is correct because UN reports indicate that 2.1 billion people worldwide lack safe, managed drinking water.

90% is correct because water-related events like floods, storms, and droughts cause 90% of major natural disasters.

30% is correct because infrastructure leaks and burst pipes result in around 30% water wastage daily.

70% is correct because global agricultural irrigation claims 70% of total freshwater withdrawals.

300 million is correct because seawater desalination technology currently serves approximately 300 million people.

48% is correct because nearly half (48% of global dams) are dedicated specifically to agricultural irrigation.

Save water without getting wasted is correct because micro-irrigation maximizes efficiency and saves water from wasteful runoff and evaporation.

Directly to the roots is correct because emitters channel water directly to the root zone of crops.

Wasted in evaporation is correct because surface pooling in hot climates causes heavy losses to atmospheric evaporation.

30 to 70 percent is correct because targeted droplet delivery saves between 30% and 70% of irrigation water.

Preventing it from spoilage is correct because preservation methods inhibit microbial growth to prevent food spoilage and extend shelf life.

For thousands of years is correct because ancient civilizations have practiced drying, salting, and fermenting for thousands of years.

Cave man is correct because early prehistoric hunter-gatherers (cave men) dried meat and berries to survive harsh seasons.

Farmers is correct because storing harvested surplus allowed humans to transition from nomads into settled agricultural farmers.

In every culture on the planet is correct because food storage and preservation techniques evolved universally across all human cultures.

Wide variety of time-tested ways is correct because centuries of experience produced a diverse toolkit of reliable food preservation methods.

Canning, freezing and drying is correct because modern domestic households most frequently rely on canning jars, freezers, and dehydration.

Vacuum sealed in special glass jars is correct because heat-sterilized food is vacuum-sealed in airtight jars to exclude oxygen and microbes.

Both A and B is correct because canning is universally suitable for fruits, vegetables, meats, and seafood.

Both A and B is correct because freezing effectively preserves produce, meats, seafood, grains, dairy, and eggs.

-18 Celsius is correct because the international standard for deep freezing is -18°C (0°F) or colder to arrest bacterial activity.

Freezing food items is correct because deep freezers maintain sub-zero temperatures specifically for long-term food freezing.

Drying is correct because the dehydration and extraction of water content from food is known as drying (desiccation).

Growth of microorganism is correct because bacteria, yeasts, and moulds need water to multiply; removing it stops microorganism growth.

Both A and B is correct because dehydration is suitable for produce, meats, seafood, grains, pulses, and nuts.

Good bacteria is encouraged to grow against bad bacteria is correct because fermentation uses beneficial microbes (probiotics) to outcompete pathogens.

All of the above is correct because sauerkraut, fermented sausages, and yogurt are all staple fermented foods.

Sauerkraut is correct because finely cut cabbage fermented by lactic acid bacteria is called sauerkraut.

Solution containing salt and acid (vinegar or lemon juice) is correct because brine and acidic liquids create an inhospitable environment for spoilage microbes.

With a wide variety of foods is correct because vegetables, fruits, eggs, and meats can all be preserved by pickling.

Dry Salting is correct because coating food in granular salt (dry salting) drew out moisture prior to widespread home canning.

Curing is correct because curing meat and fish involves precise proportions of salt, nitrates, and moisture/temperature controls.

Salt, acid and nitrates is correct because curing agents combine sodium chloride, organic acids, and nitrites/nitrates to inhibit botulism.

Meat and fish is correct because curing is uniquely tailored for preserving animal proteins like meat and fish.

Curing is correct because both curing and pickling rely on salt and acidic chemical preservation mechanisms.

Louis Pasteur is correct because Louis Pasteur demonstrated that controlled thermal heating eliminates pathogenic bacteria in milk and wine.

Technique of pasteurization is correct because thermal pasteurization is directly named in honour of Louis Pasteur.

Both A and B is correct because acid brine causes slight discoloration along with a distinct tangy taste and flavour shift.

It will last for months is correct because high acidity and salt content preserve pickled foods safely for many months.

Stethoscope is correct because a stethoscope acoustic device allows medical doctors to auscultate heart and lung sounds.

By using some very simple materials is correct because an acoustic stethoscope model can be assembled from basic everyday household items.

All of the above is correct because the DIY model uses two funnels, clear tubing, and stretched balloon diaphragms.

One two feet-long plastic tube (colorless) is correct because a two-foot colorless plastic tube provides the acoustic conduit.

How heart rates are different for different people is correct because it demonstrates cardiovascular variation and pulse differences among individuals.

Number of times your heart beats in one minute is correct because you can measure and compare beats per minute (BPM).

To prevent themselves from germs and stay protected from corona virus is correct because sanitizers disinfect hands and reduce viral transmission.

Soap removes germs, sanitizer kills germs from skin is correct because soap mechanically washes microbes away, whereas alcohol chemically inactivates/kills microbes in place.

One that kills germs and the other which is good for skin is correct because alcohol acts as the antimicrobial agent while aloe vera moisturizes the skin.

2/3 cup is correct because the DIY formulation specifies using 2/3 cup of rubbing alcohol (ethanol/isopropanol).

1/3 cup is correct because the mixture blends 1/3 cup of soothing aloe vera gel with the alcohol base.

5-10 drops is correct because adding 5 to 10 drops of essential oil adds fragrance without diluting the alcohol potency.

Ethanol is correct because ethanol (ethyl alcohol) is the disinfecting agent blended with aloe vera.

Kills germs is correct because ethanol denatures microbial proteins, acting as the primary agent that kills germs.

Good for skin is correct because aloe vera acts as an emollient that is good for skin and prevents drying.

Fragrance is correct because natural essential oils are included specifically to provide an appealing fragrance.

2% is correct because fresh water comprises only 2% of Earth's total water.

Reach the roots directly is correct because micro-tubing channels water directly to crop roots, cutting evaporation loss.

Garnishing is correct because garnishing is simply decorative food presentation and does not preserve food.

Pickling is correct because vinegar and brine pickling is the most effective and widespread method for preserving vegetables.

Stethoscope is correct because an acoustic medical device used to listen to internal heart sounds is a stethoscope.

Funnels, plastic tube, balloons and duct tape is correct because assembling the complete DIY acoustic model requires funnels, flexible tubing, balloons, and tape.

Killing germs from the skin and keeping it safe is correct because alcohol sanitizers rapidly kill skin pathogens and maintain hand hygiene.

Solution of salt and acid is correct because soaking food in a solution of salt and acid (vinegar/lemon juice) preserves it.

Fermentation is correct because fermentation utilizes beneficial bacterial cultures to preserve food.

Heating at a certain temperature to keep food microbe free is correct because pasteurization uses controlled heat treatment to destroy pathogenic microbes.