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Class 5 EVS – 50 Questions Class 5 EVS – 50 Important Questions and Answers 🔊 Play Text to Speech (Slow Indian English) 1. Question: How do dogs track people? Answer: Dogs track people with their strong sense of smell. 2. Question: Which bird has sharp eyesight? Answer: An eagle has very sharp eyesight. 3. Question: What do snakes eat? Answer: Snakes eat rats and frogs. 4. Question: Do snakes have ears? Answer: Snakes do not have ears but they feel vibrations. 5. Question: Where does digestion start? Answer: Digestion starts in the mouth. 6. Question: What helps digestion? Answer: Saliva helps digestion. 7. Question: Why are mangoes pickled? Answer: Mangoes are pickled to preserve them. 8. Question: What is sprouting? Answer: Sprouting is the process by which seeds grow into small plants. 9. Question: What is the main source of water? Answer: Rain is the main source of water. 10. Question: Why should we save water? Answer: We should save water because i...

Congruence - Classes 6 to 10 Congruence (Classes 6–10) Meaning of Congruence Two figures are congruent if they have the same shape and the same size. Symbol used: ≅ If △ABC ≅ △DEF, then: AB = DE BC = EF AC = DF Corresponding angles are equal Rules (Criteria) of Congruence 1. SSS (Side–Side–Side) If three sides of one triangle are equal to three sides of another triangle, then the triangles are congruent. 2. SAS (Side–Angle–Side) If two sides and the included angle are equal, then triangles are congruent. 3. ASA (Angle–Side–Angle) If two angles and the included side are equal, then triangles are congruent. 4. AAS (Angle–Angle–Side) If two angles and one corresponding side are equal, then triangles are congruent. 5. RHS (Right angle–Hypotenuse–Side) In right-angled triangles, if the hypotenuse and one side are equal, then triangles are congruent. 20 Questions with Step-by-Step Answers Q1. Triangles with sides 5 cm, 6 cm, 7 cm and 5 ...

Class 9 – Powers and Exponents (Solutions) Class 9 – Powers and Exponents Step-by-Step Solutions 1. Simplify (2 5 × 3 4 × 5 2 ) / (2 3 × 3 2 × 5) 2 5−3 × 3 4−2 × 5 2−1 = 2 2 × 3 2 × 5 = 4 × 9 × 5 = 180 Answer: 180 2. Simplify (3 −2 × 9 3 ) / 27 9 = 3 2 , 27 = 3 3 = (3 −2 × (3 2 ) 3 ) / 3 3 = (3 −2 × 3 6 ) / 3 3 = 3 1 = 3 Answer: 3 3. Evaluate (2 3 × 5 −1 ) / 10 −2 2 3 = 8, 5 −1 = 1/5 = (8/5) ÷ (1/100) = (8/5) × 100 = 160 Answer: 160 4. Simplify ((a 3 b −2 ) / (a −1 b 4 )) 2 = (a 4 b −6 ) 2 = a 8 b −12 = a 8 / b 12 Answer: a 8 / b 12 5. Find x 3 2x = 81 x−1 81 = 3 4 3 2x = 3 4x−4 2x = 4x − 4 x = 2 Answer: x = 2 6. Simplify ((4 3 ) 2 × 8 −1 ) / 2 5 4 = 2 2 , 8 = 2 3 = 2 12 × 2 −3 / 2 5 = 2 4 = 16 Answer: 16 7. Given a 2 b 3 = 72 and ab = 6 (a 2 b 3 ) / (ab) = 72 / 6 ab 2 = 12 Answer: 12 8. Simplify ((x −2 y 3 ) 3 ) / (x 4 y −2 ) = x −6 y 9 / x 4 y −2 = x −10 y ...

Powers of Numbers - Mathematical Formulas Mathematical Formulas on Powers of Numbers 1. Basic Definition of Power a n = a × a × a × ... (n times) Example: 2 4 = 2 × 2 × 2 × 2 = 16 2. Laws of Exponents Product Rule (Same Base) a m × a n = a m+n Example: 3 2 × 3 4 = 3 6 Quotient Rule (Same Base) a m / a n = a m−n (a ≠ 0) Example: 5 7 / 5 3 = 5 4 Power of a Power (a m ) n = a mn Example: (2 3 ) 4 = 2 12 Power of a Product (ab) n = a n b n Example: (3 × 4) 2 = 3 2 × 4 2 Power of a Quotient (a / b) n = a n / b n (b ≠ 0) 3. Special Exponent Rules Zero Power Rule a 0 = 1 (a ≠ 0) Negative Exponent Rule a −n = 1 / a n (a ≠ 0) Example: 2 −3 = 1 / 2 3 = 1/8 Fractional Exponents a 1/n = √[n]a a m/n = √[n](a m ) Example: 8 1/3 = ∛8 = 2 4. Important Identities 1 n = 1 0 n = 0 (n > 0)

Congruence in geometry just means that two shapes are identical twins . They are the exact same size and the exact same shape. If you picked one up and placed it on top of the other, they would match perfectly. The 5 Ways to Prove Triangles are Congruent To prove two triangles are identical, you don't need to measure every single side and angle. You only need three specific pieces of information: SAS: Side - Angle - Side (The angle must be between the sides). ASA: Angle - Side - Angle (The side must be between the angles). AAS: Angle - Angle - Side. SSS: Side - Side - Side (All three sides match). RHS: Right angle - Hypotenuse - Side. 1. The Side-Angle-Side (SAS) Rule Q: If AB = PQ , BC = QR , and the angle between them ( angle B = angle Q ) is the same, are the triangles congruent? Step 1: Look at what we have: Two sides match, and the "corner" (angle) between them matches. Step 2: This fits the SAS rule perfectly. Conclusion: Yes, they are congruent. 2. The Is...

English Grammar : Phrasal Verbs What are Phrasal Verbs? Phrasal verbs are combinations of a verb + preposition or verb + adverb (sometimes both) that create a new meaning different from the original verb. Example: Look = देखना Look after = देखभाल करना Phrasal verbs are very common in spoken and written English. Types of Phrasal Verbs Intransitive Phrasal Verbs (No object needed) The plane took off . (Plane = subject; no object) Transitive Phrasal Verbs (Object needed) She turned off the light. (Light = object) Separable Phrasal Verbs She turned off the light . She turned the light off . Inseparable Phrasal Verbs She looks after her sister. (Cannot say: looks her sister after ❌) Common Phrasal Verbs with Meanings & Sentences Bring up – Mention / Raise She brought up an important topic. उसने एक महत्वपूर्ण विषय उठाया। Call off – Cancel They called off the meeting. उन्होंने बैठक रद्द कर दी। Carry on – Continue Please carry...