Complete Science Test - Class 9 MCQ

Gymnosperms are those plants that have naked seeds. The seeds are not enclosed inside the ovary.

Kala azar or sleeping sickness is dangerous disease caused by protozoa Leshmania genus. It is transmitted by bite of infected female sandflies.

Gravitational potential energy depends upon mass, height and acceleration due to gravity. P.E = mgh.

The valency of Ca in Ca₃(PO₄)is 2. As the formula of compound is formed by cross multiplying the valency.

Movement of air occurs due to difference in air pressure of two places. It is not influenced by rotation of earth, vaporization and condensation of water vapour and topography over which passes.

Neutrons are present in the nucleus of atom. Mass of neutron is slightly more than proton. Proton is not a universal particle because it is not present in protieum, isotopes of hydrogen.

The five kingdom of classification was proposed by R. Whittaker. These kingdoms were Monera, Protista, Fungi, Plantae and Animalia.

Germinated pulses contain more vitamins. A vegetarian diet is better than a non-vegetarian diet. Proteins give less energy than fats and carbohydrates. We should prefer balanced diet in place of fast food.

The maximum displacement from the particle of the mean position is called the Amplitude. Loudness of sound depends upon amplitude.

The envelop of air surrounding the surface of planets is called atmosphere. Earth, Venus and Mars all these planets have their own atmosphere.

One mole of N₂ is equal to 28 g of nitrogen or 6.022 × 10²³ molecules.

Neil Bohr got the noble prize for the work on the structure of atom. He proposed the Bohr model of atom having desecrate shell in which electrons are distributed.

The Whittaker’s classification includes five kingdom in which unicellular organisms having Eukaryotic cell are placed in kingdom Protista.

Asthma and Diabetes are chronic disease as they last for long duration and adversely affects the health of individual. Common cold is acute disease.

1 unit (Kw-H) = 3.6×10⁶ joule. Therefore, 250 units = 250 × 3.6 × 10⁶ joule = 9 × 10⁸ Joule.

Distance between two consecutive crests is called wavelength. Here, wavelength= 100 m, wave velocity = 20m/s. frequency = wave velocity/ wavelength. Frequency= 20/100 = 0.2Hz.

Biologically important compounds that contain both oxygen and nitrogen is protein and nucleic acid. These compounds contain oxygen and nitrogen besides carbon and hydrogen.

Democritus and Leucippus suggested that if we go dividing matter, a stage will come when particles obtain can’t be divided further.

Electron is presents in all atoms. So, electron is regarded as universal particle.Electron are distributed in shell around the nucleus.

Crests and troughs are formed in transverse wave. The upward movement from mean position is called crest and downward movement is called troughs.

When a body moves on a circular path. The force that acts on the revolving body towards the center is called centripetal force. As the force acts as right angle to the direction of motion, so work done is 0.

The atmosphere of Venus and Mars planet consists of mainly carbon dioxide gas. Due to presence of higher amount of carbon dioxide gas temperature increases very high during day and low during night.

Robert Koch was the first pathologists who established that disease are mainly caused by pathogen. Disease causing microbes are called pathogen

Dalton was the first scientists who use the symbols for elements. The modern symbols are different from symbol proposed by Dalton.

The radius of extra nuclear portion is more than that of the nucleus of an atom. Nuclear region is small portion of atom as compared to whole atom.

Loudness of sound depends upon amplitude. Amplitude is the maximum displacement from mean position.

Power of bulb = 150w, work done = 3000 joule, time taken= work done/power = 3000/150 = 20 s.