Multiply the binomials: (2pq + 3q2) and (3pq – 2q2)
Answer: 6p2q2 + 5pq3 – 6q4 Polynomials are algebraic expressions that consist of variables and coefficients. Polynomials are of 3... View Article
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Multiply the binomials: (2x + 5) and (4x – 3)
Answer: 8x² + 14x – 15 Polynomials are algebraic expressions that consist of variables and coefficients. Polynomials are of 3... View Article
Multiply the binomials: (3/4 a2 + 3b2) and 4( a2 – 2/3 b2)
Answer: 3a4 + 10a²b² – 8b4 Polynomials are algebraic expressions that consist of variables and coefficients. Polynomials are of 3... View Article
Multiply the binomials: (a + 3b) and (x + 5)
Answer: ax + 5a + 3bx + 15b Polynomials are algebraic expressions that consist of variables and coefficients. Polynomials are... View Article
Multiply the binomials: (y – 8) and (3y – 4)
Answer: 3y2 – 28y + 32 Polynomials are algebraic expressions that consist of variables and coefficients. Polynomials are of 3... View Article
Name the effect of current responsible for the glow of the bulb in an electric circuit.
Answer: Heating effect of electric current responsible for the glow of the bulb in an electric circuit. Use of heating... View Article
Name the part of the eye which gives colour to the eyes
Answer: Iris the part of the eye which gives colour to the eyes. Human Eye The eye is an important... View Article
Name the property under multiplication used in the following. -13/17 × (-2/7) = -2/7 × (-13/17)
Answer: Commutative: It states that the order of numbers in addition and multiplication does not matter. The end result will... View Article
Name the property under multiplication used in the following. -19/29 × 29/-19 = 1
Answer: The multiplicative inverse of a number N is represented by 1/N or N-1. It is also called reciprocal, derived... View Article
Name the property under multiplication used in the following. -4/5 × 1 = 1 × (-4/5) = -4/5
Answer: The multiplicative inverse of a number N is represented by 1/N or N-1. It is also called reciprocal, derived... View Article
Name the scale on which the destructive energy of an earthquake is measured. An earthquake measures 3 on this scale. Would it be recorded by a seismograph? Is it likely to cause much damage?
Answer: Richter scale is used to measure the destructive energy of an earthquake. The scale has a reading from 1... View Article
Name three liquids, which when tested in the manner shown in Fig., may cause the magnetic needle to deflect.
Answer: Saltwater Lemon juice Vegetable oil Any liquid solution containing acidic or basic salt will cause this effect. A solution... View Article
Name two musical instruments which produce sound by vibrating strings?
Answer: Guitar and sitar are two musical instruments with vibrating strings that make sound. The vibrating part in a sitar... View Article
Near the earth’s surface __________air rises up whereas ___________ air comes down.
Answer: Near the earth’s surface, warm air rises up whereas cold air comes down. The movement of air is mainly... View Article
Observe Fig. Which of these two circuits A or B shows the correct observation?
Answer: Because a greenish blue spot is always created around the positive terminal of the battery, Circuit A indicates the... View Article
Observe the circuit given in Fig. Boojho set up this circuit for purification of copper. What will be the nature of – (i) plate A (ii) plate B (iii) the solution? Explain the process of purification.
Answer: (i) In plate A- Pure copper (ii) In plate B- Impure copper (iii) The solution – Copper sulphate solution... View Article
Observe the following circuit given in Fig. Current does not flow in the circuit if there is a gap between the two wires. Does it indicate that air is a poor conductor of electricity? Does air never conduct electricity? Explain.
Answer: Air is a poor conductor of electricity in general. However, under some conditions, such as when lightning strikes, air... View Article
Observe the following circuits carefully. In which circuit will the bulb glow. Write ‘Yes’ or ‘No’ in the blank space provided along each of the circuit given in Fig.
Answer: No Yes. Because iron is a metal, it is an excellent conductor of electricity. No. Eraser is material which... View Article
Observe the vessels A, B, C and D shown in Fig. carefully. The volume of water taken in each vessel is as shown. Arrange them in the order of decreasing pressure at the base of each vessel. Explain.
Answer: The pressure at depth due to the liquid column is determined by the Gravitational acceleration (g) The density of... View Article
Obtain the product of (i) 2, 4y, 8y2 , 16y3 (ii) a, 2b, 3c, 6abc (iii) m, -mn, mnp
Answer: (i) 2, 4y, 8y2 , 16y3 2 × 4y × 8y2 × 16y3 ⇒ (2 × 4 × 8... View Article
