UP Board Class 10 Science Question Paper 2025 (Code 824 CM) with Answer Key and Solutions PDF is Available to Download

The unit of power of a lens is

• (A) metre
• (B) metre \(\times\) second
• (C) per metre
• (D) metre/second

The image formed by a mirror is virtual, erect and longer than the object, then the mirror will be

• (A) convex mirror
• (B) concave mirror
• (C) plane mirror
• (D) both convex and concave mirrors

The refractive index of glass is 1.5. The speed of light in air is \(3 \times 10^8\) m/s. The speed of light in glass will be

• (A) \(3 \times 10^8\) m/s
• (B) \(2 \times 10^8\) m/s
• (C) \(4.5 \times 10^8\) m/s
• (D) \(2.25 \times 10^8\) m/s

The blue colour of the sky is due to the

• (A) reflection of light
• (B) dispersion of light
• (C) refraction of light
• (D) scattering of light

If the electric current passing through a fixed resistor is halved, then the heat produced in it will become

• (A) double
• (B) half
• (C) one-fourth
• (D) four times

The magnitude of magnetic force acting on a current carrying conductor in a uniform magnetic field does not depend on

• (A) electric current
• (B) intensity of magnetic field
• (C) length of the conductor
• (D) direction of electric current

At the time of short circuit, the electric current in the circuit becomes

• (A) very low
• (B) does not change
• (C) very high
• (D) varies continuously

Valency of atom C in C_6H_6 is

• (A) 1
• (B) 2
• (C) 4
• (D) 6

Strong base is

• (A) NaOH
• (B) NH\(_4\)OH
• (C) Cu(OH)\(_2\)
• (D) Al(OH)\(_3\)

O_2(g) is obtained on heating

• (A) CaCO_3(s)
• (B) C_6H_{12}O_6(s)
• (C) Pb(NO_3)_2(s)
• (D) Na_2CO_3(s)

Liquid metal at ordinary temperature is

• (A) Mg
• (B) Cu
• (C) Cr
• (D) Hg

Precipitation reaction is

• (A) BaCl\(_2\) (aq) + H\(_2\)SO\(_4\) (aq) \(\rightarrow\) BaSO\(_4\) (s) + 2HCl (aq)
• (B) HCl (aq) + NaOH (aq) \(\rightarrow\) NaCl (aq) + H\(_2\)O (l)
• (C) MgCO\(_3\) (s) + H\(_2\)SO\(_4\) (aq) \(\rightarrow\) MgSO\(_4\) (aq) + H\(_2\)O (l) + CO\(_2\) (g)
• (D) 4Na (s) + O\(_2\) (g) \(\rightarrow\) 2Na\(_2\)O (s)

Molecular formula of butanol-2 is

• (A) C\(_4\)H\(_{10}\)O
• (B) C\(_4\)H\(_8\)O\(_2\)
• (C) C\(_4\)H\(_{10}\)
• (D) C\(_4\)H\(_8\)

What are required for photosynthesis?

• (A) Oxygen, Carbon dioxide, Chloroplast and Darkness
• (B) Carbon dioxide, Water, Mitochondria and Sunlight
• (C) Carbon dioxide, Water, Chloroplast and Sunlight
• (D) Nitrogen, Water, Chloroplast and Sunlight

What is required for the synthesis of thyroxine hormone ?

• (A) Chlorine
• (B) Iodine
• (C) Fluorine
• (D) None of these

Mendel crossed long and dwarf plants of pea. The percentage of long and dwarf plants in first filial generation (F\(_1\)) was

• (A) 100% long plants
• (B) 100% dwarf plants
• (C) 50% long and 50% dwarf plants
• (D) 100% plants of medium size

Which of the following is a biotic component of Ecosystem ?

• (A) Green plants
• (B) Temperature
• (C) Air
• (D) Mineral

'Guard Cells' are found in

• (A) lung
• (B) liver
• (C) stomata
• (D) heart

Ozone gas present in upper surface of atmosphere protects earth from which radiation coming from sun?

• (A) Ultraviolet
• (B) Gamma ray
• (C) X-Ray
• (D) Infrared

Which of the following is correctly matched?

• (A) Fission — Amoeba
• (B) Fragmentation — Bryophyte
• (C) Budding — Spirogyra
• (D) Vegetative propagation — Hydra

(i) Explain with the help of labelled ray diagram, the defect of hypermetropia. How is it corrected by a lens?

(ii) An object at a distance of 16 cm from a spherical mirror forms a virtual image at a distance of 12 cm behind the mirror. Determine the magnification of the image and type of the mirror.

(i) Draw a labelled ray diagram to show the formation of a virtual magnified image of an object by a convex lens.

(ii) A convex lens produces an inverted image magnified three times of an object placed at a distance of 15 cm from it. Calculate focal length of the lens.

In the given electric circuit find the current shown by ammeter A.

Why is tungsten normally used for the construction of filaments of electric bulbs?

(i) State any two factors on which the strength of magnetic field produced by a current-carrying solenoid depends.

(ii) How does an electromagnet differ from a permanent magnet?

(iii) State Fleming's left-hand rule.

(i) Explain the importance of using fuse in a household electric circuit.

(ii) What are the usual colours of the following insulations of the electric supply wires?

(iii)What is the main purpose of earthing an electrical appliance?

(i) In how many steps, is impure metal obtained from concentrated sulphide ore?

(ii) Explain the purification of impure copper by electrolytic method giving a neat diagram.

(i) Select oxidising and reducing agents with reason in the following reactions:

(ii) Write the pH value of pure water.

(i) Write the applications of the following inorganic compounds:


(a) Plaster of Paris

(b) Bleaching Powder

(c) Sodium Bicarbonate

(ii) What happens when (write chemical equation only):

Ethanol is heated with \(K_2Cr_2O_7\) and concentrated sulphuric acid?
Ethyl alcohol is heated with glacial acetic acid in presence of conc. \(H_2SO_4\)?
Acetic acid reacts with sodium bicarbonate?

(i) What happens when (write chemical equation only):



Plaster of Paris reacts with water?
\(NH_3 (g)\) and \(CO_2 (g)\) are passed in the solution of saturated aqueous solution of NaCl?
\(Ca(OH)_2\) (dry) reacts with \(Cl_2\) (g) (dry)?

(ii) Explain the cleansing action of soap.

(i) Food chain

(ii) Growth hormone in human.

Differentiate between Autotrophic Nutrition and Heterotrophic Nutrition with examples.

Write short notes on:
(i) Reflex action

(ii) Lymph

Describe the structure and working method of excretory system of human.

Describe the transport in plants and write its importance.