Sunday, 16 December 2012

CBSE Class 9 - PSA Quiz (Social Science)

PSA Quiz (Social Science)

(Sample PSA paper from a public school in Delhi)(Passage based MCQs) Read the given passage carefully and answer the following questions:

The heaviest rainfall (11520 cm) in the world has been recorded in Mawsynram (Meghalaya) while the western part of Jaisalmer district is one of the driest part of the world, recording about 9cm of rainfall in a year. There is a wide contrast in the amount of rainfall received by different parts of the country. There is wide contrast in the amount of rainfall received by different parts of the country. Total rainfall increases generally eastward.

Q1: At which place has the maximum rainfall in the world been recorded?

(a) Karakoram
(b) Amritsar
(c) Mawsynram
(d) Indore

Saturday, 15 December 2012

CBSE Class 9 - PSA Quiz (Physics)


PSA Quiz (Physics)
(Passage based MCQs)
The distance time graph shows the motion of four cows walking from the grass land to their sheds. Choose the appropriate option from multiple choices given:

Q1: Based on average velocity, which cow is the fastest?


(a) Kareena
(b) Katrina
(c) Priyanka
(d) Bipasha

CBSE Class 10 - Physics - CH11: The Human Eye and the Colourful World (NCERT Q & A)

The Human Eye and the Colourful World
CBSE Class 10 - Physics - CH11: The Human Eye and the Colourful World (NCERT Q & A)
Dispersion of Light
Which light bends the most?
credits:wpclipart
(NCERT Chapter Q & A, Other Questions asked in CBSE Exam)

Q1(NCERT): What is meant by power of accommodation of the eye?

Answer: Power of accommodation is the ability of the eye lens to focus near and far objects clearly on the retina by adjusting its focal length. Power of accommodation of the eye is limited. It implies the focal length of the eye lens cannot be reduced beyond certain minimum limit.

Q2(CBSE 2011): A person cannot see the objects distinctly, when placed at a distance less than 50 cm.
(a) Identify the defect of vision.
(b) Give two reasons for this defect.
(c) Calculate the power and nature of the lens he should be using to see clearly the object placed at a distance of 25 cm from his eyes.
(d) Draw the ray diagrams for the defective and the corrected eye.


Answer: (a) Defect of vision = Hypermetropia  or Long-sightedness

Friday, 14 December 2012

CBSE Class 7 - Maths - CH8 - Comparing Quantities (Percentage, Ex 8.2)

Comparing Quantities 
(Percentage)

Important Points

1. Per cent is derived from Latin word ‘per centum’ meaning ‘per or out of hundred
2. 25% = 25 out of hundred = 25/100 = 1/4 = 0.25
3. Graphically it can be represented as shown.
4.Fractions and decimals can be converted to percentages and vice versa.

Q1: Convert the following to per cents:





Answer:

Thursday, 13 December 2012

CBSE Class 10 - Geography - CH6 - Manufacturing Industries

Manufacturing Industries
CBSE Class 10 - Economics - CH6 - Manufacturing Industries

MCQs

Q1(NCERT): Which one of the following industries uses limestone as a raw material.

(a) Aluminium
(b) Cement
(c) Sugar
(d) Jute


Q2(NCERT): Which one of the following agencies markets steel for the public sector plants?

(a) HAIL
(b) SAIL
(c) TATA Steel
(d) MNCC

Tuesday, 11 December 2012

CBSE Class 9 - PSA Quiz (Biology)

PSA Quiz (Biology)
CBSE Class 9 - PSA Quiz (Biology)

Passage based MCQs (1-5)
Nutrition and Health Benefits

Many consumers make food choices that will benefit health. Food manufacturers and restaurant chefs have responded to scientific findings linking health with nutrition by offering an abundant selection of health-promoting foods and beverages. Foods that provide health benefits beyond their nutrient contributions are called functional foods. Whole foods—as natural and familiar as oatmeal or tomatoes—are the simplest functional foods. In other cases, foods have been modified to provide health benefits, perhaps by lowering the fat contents. In other cases, manufacturers have fortified foods by adding nutrients or phytochemicals that provide health benefits Examples of these functional foods include orange juice fortified with calcium to help build strong bones and margarine made with a plant sterol that lowers blood cholesterol.
Consumers typically welcome new foods into their diets, provided that these foods are reasonably priced, clearly labeled, easy to find in the grocery store, and convenient to prepare. These foods must also taste good—as good as the traditional choices. Of course, a person need not eat any of these “special” foods to enjoy a healthy diet; many “regular” foods provide numerous health benefits as well. In fact, “regular” foods such as whole grains; vegetables and legumes; fruits; meats, fish, and poultry; and milk products are among the healthiest choices a person can make.
(Passage Taken from Book: Understanding Nutrition by Roles, Pinna, Whitney)
Q1: Which of the following is the simplest functional food?

(a) margarine with sterol extract
(b) oatmeal
(d) orange juice with Calcium
(e) chocolates

Sunday, 9 December 2012

CBSE Class 8/9/10 - Hindi - अनुच्छेद - पुस्तकें एवं कंप्यूटर - किसका वर्चस्व

पुस्तकें एवं कंप्यूटर - किसका वर्चस्व ?
(अनुच्छेद) 

श्रमार्जन जीवनपर्यंत चलने वाली प्रक्रिया है । यह ज्ञान हम विभिन्न इन्द्रियों द्वारा भिन्न - भिन्न स्त्रोतों से प्राप्त करते हैं ।  

परन्तु पुस्तकें प्राचीन कल से ज्ञान अर्जन का एक सार्थक साधन रही हैं । पुस्तकों द्वारा हम वह समय जो हमने देखा नहीं, सुना नहीं परन्तु उपरोक्त का सम्पूर्ण ज्ञान हम प्राप्त कर सकते हैं । 

जैसे - जैसे मनुष्य का बौद्धिक विकास हुआ वैसे -2 तकनीकी विकास ने करवट ली । और उसने सम्पूर्ण विश्व को एक मुट्ठी में सिकोड़ लिया । इसीका विश्वव्यापी उदहारण है - कम्प्यूटर । कंप्यूटर पर घर बैठे ही हमें विश्वदर्शन हो जाता है  और इतना ही नहीं हमें विश्व की घटनायों से जोड़ भी सकता है ।