CBSE Class 9 - Science - CH 12 - Sound (Worksheet)

SOUND

Worksheet

RADAR works on which principle?

Fill in the blanks

1. When we hear music, the medium through which the sound transmitted is __________ (solid, liquid, gas)

2. If a body repeats its motion, within fix interval of time, along a certain path, about a fixed point, it is said to have ____________.

3. A ________ (pulse/wave) is a form of disturbance which travels through a medium as a result of repetitive oscillations of the particles of the medium.

4. A ________ (pulse/wave) is a disturbance which is sudden and lasts for a short duration of time.

CBSE Class 7 - Science - CH11 - Transportation in Animals and Plants

Transportation in Animals and Plants

Human Heart
(credits:wpclipart)

NCERT Solution, Q & A

Q1(NCERT): Fill in the blanks.

i.     The blood from the heart is transported to all parts of the body by the ___________________.

ii.    Haemoglobin is present in ______________ cells.

iii.   Arteries and veins are joined by a network of ______________.

iv.   The rhythmic expansion and contraction of the heart is called _________________.

v.    The main excretory product in human beings is _____________.

vi.   Sweat contains water and _______________.

vii.  Kidneys eliminate the waste materials in the liquid form called _______________.

viii. Water reaches great heights in the trees because of suction pull caused by _____________.


Answer:

CBSE Class 9 - Science - Why do we Fall ill? (MCQs)

Why do we Fall ill? 

(MCQs)

Q1: Which one of the following is an infectious disease?

(a) diptheria
(b) diabetes
(c) hypertension
(d) cancer


Q2: Elephantiasis disease can have

(a) short-term affect on our health
(b) no effect on our health
(c) long term affect on our health
(d) sometimes bad effect on our health

CBSE Class 9 - Hindi - अपठित काव्यांश -1

अपठित काव्यांश

(CBSE 2010) दिए गए काव्यांश  को पढकर पूछे गए प्रश्नों के सही विकल्प को चुनिए -

वह तोडती पत्थर ।
देखा मैंने इलाहाबाद के पथ पर,
वह तोडती पत्थर ।
कोई न छायादार
पेड वह जिसके तले बैठी स्वीकार,
श्याम तन, भर बँधा यौवन,
नत नयन, प्रिय कर्म रत मन ।
गुरु हथौडा हाथ।
करती बार-बार प्रहार 

सामने तरु मालिका, अट्टालिका प्राकार
चढ रही थी धूप,
गर्मियों के दिन

CBSE CLass 10 - English Comm. Workbook - Integrated Grammar Practice 5

Integrated Grammar Practice 5

1. Given below is a dialogue between Punit and Jai. Complete the dialogue by choosing the correct options.

Punit : Jai! (a) __________________________________________________________?

Jai : Don't you know? (b) __________________________ due to cardiac arrest.

Punit : Oh no!(c) __________________________________________________. How did this happen?

Jai : I don't know what happened. But Amit (d) ______________________ and was immediately rushed to the hospital.

Punit : Oh I am shocked. What did the doctors say?

Jai : They (e) __________________________________________________________

Answer:

CBSE Class9 - Science - CH11 - Work and Energy

WORK AND ENERGY

NCERT Solutions and Q & A


Q1: A roller coaster is shown in figure, at points i.e. ➊ and ➋, comparatively at what point 
(i) potential energy is maximum
(ii) kinetic energy  is maximum

Answer: At point ➊, comparatively kinetic energy will be maximum and at point ➋ potential energy will be maximum.

Science & Technology Objective Test (Haryana Board)/NTSE Science Quiz-17

Science & Technology Objective Test

(Haryana Board)

NTSE Science Quiz-17

Q1: The speed of light in vacuum is

(a) 3 ×10⁸ m/s
(b) 3 ×10¹⁰ m/s
(c) 3 ×10⁵ m/s
(d) Zero

Q2: The angle of incidence for a ray of light is 45°. The angle of Reflection will be:

(a) 90°
(b) 45°
(c) 180°
(d) 0°